Installation and Operation Manual VC-6A. 6-Channel PCM/ADPCM Voice Module MEGAPLEX-2100 MODULE

Transcription

1 Installation and Operation Manual VC-6A 6-Channel PCM/ADPCM Voice Module MEGAPLEX-2100 MODULE

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3 VC-6A 6-Channel PCM/ADPCM Voice Module Installation and Operation Manual Notice This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD"). No part of this publication may be reproduced in any form whatsoever without prior written approval by RAD Data Communications. Right, title and interest, all information, copyrights, patents, know-how, trade secrets and other intellectual property or other proprietary rights relating to this manual and to the VC-6A and any software components contained therein are proprietary products of RAD protected under international copyright law and shall be and remain solely with RAD. VC-6A is a registered trademark of RAD. No right, license, or interest to such trademark is granted hereunder, and you agree that no such right, license, or interest shall be asserted by you with respect to such trademark. You shall not copy, reverse compile or reverse assemble all or any portion of the Manual or the VC-6A. You are prohibited from, and shall not, directly or indirectly, develop, market, distribute, license, or sell any product that supports substantially similar functionality as the VC-6A, based on or derived in any way from the VC-6A. Your undertaking in this paragraph shall survive the termination of this Agreement. This Agreement is effective upon your opening of the VC-6A package and shall continue until terminated. RAD may terminate this Agreement upon the breach by you of any term hereof. Upon such termination by RAD, you agree to return to RAD the VC-6A and all copies and portions thereof. For further information contact RAD at the address below or contact your local distributor. International Headquarters RAD Data Communications Ltd. 24 Raoul Wallenberg St. Tel Aviv Israel Tel: Fax: market@rad.com North America Headquarters RAD Data Communications Inc. 900 Corporate Drive Mahwah, NJ USA Tel: (201) , Toll free: Fax: (201) market@radusa.com RAD Data Communications Ltd. Publication No /06

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5 Quick Start Guide If you are familiar with the product, use this guide to prepare it for operation. 1. Installing the Module To install a VC-6A/E&M module, perform the following steps: 1. Set the signaling mode switches SW1-SW3 to the required signaling mode (use the table below and the figure on the next page as a guide). Signaling Mode Switch SW1 Switch SW2 Switch SW3 RS-464 Type I ON ON ON RS-464 Type II ON OFF ON RS-464 Type III ON ON ON RS-464 Type V OFF OFF OFF BT SSDC5 OFF OFF OFF 2. For VC-6A/E&M with 4-wire only, set the module channels amplification jumpers S1 to S7 as required (use the table below and the figure on the next page as a guide). Jumper No. State Amplification S1, S2, S3, S4, S5, S6, S7 ON OFF +8 dbm +2 dbm 3. Insert the module in the assigned I/O slot of the Megaplex enclosure. 4. Configure the module as detailed below in the configuration procedure. To install an FXS or FXO module, perform the following steps: 1. Insert the module in the assigned I/O slot of the Megaplex enclosure. 2. Configure the module as detailed below in the configuration procedure. Installing the Module 1

6 Quick Start Guide VC-6A Installation and Operation Manual S1 ADPCM Sub-board (not installed on P option modules) SW1 SW2 ON SW3 S2 S3 F4 F5 OFF F6 F7 S5 S4 S6 RX Amplification S1, S2, S3, S4, S5, S6, S7 OFF Default F8 F9 F10 F11 S1, S2, S3, S4, S5, S6, S7 ON 4-Wire only F12 F13 S7 F14 F15 2. Configuring the Module Start VC-6A configuration by entering the command: DEF CH A:*<Enter>. The configuration parameters and the allowed range of values are listed below. General Parameters Parameter Wires Num Coding Signaling Profile Range of Values 2 WIRES (all) 4 WIRES (E&M only) a LAW u LAW CAS (E1 only) RBMF SIGNALING (T1 only) ROBBED BIT FRAME NO SIGNALING Parameter OOS Signal ML Slot ML Channel Encoding Range of Values IDLE BUSY BUSY IDLE FORCED IDLE FORCED BUSY IO-1 to IO-12 Parameter Interface Metering Range of Values LOOP START GROUND START 12kHz 16kHz Channel Parameters EX1 EX R 3M 3RM 4 PCM ADPCM Parameter Connect Transmit Level Receive Level Operation Mode Range of Values YES NO E&M: +8 to -17 dbm FXS: +8 to -13 dbm FXO: +7 to -18 dbm E&M: 2w:+2 to -23 dbm 4w:+2 to -17 dbm (w/o ampl.) +8 to -17 dbm (w/ ampl.) FXS: +2 to -17 dbm FXO: +1 to -23 dbm BI-DIRECTIONAL UNIDIRECTIONAL BROADCAST 2 Configuring the Module

7 Contents Chapter 1. Introduction 1.1 Overview Product Options E&M Module FXS and FXO Modules Unidirectional and Broadcast Applications Physical Description Functional Description Audio Performance Timeslot Assignment Handling of Signaling Information Configuration and Management Test and Diagnostic Capabilities Technical Specifications Chapter 2. Installation and Setup 2.1 Introduction Setting Internal Jumpers and Switches Inserting the Module into Enclosure Connecting the Cables Connecting the Voice Channels Connecting the External -48 VDC Voltage Normal Indications Chapter 3. Configuring the Module 3.1 Overview Configuration Parameters Module Parameters Channel Parameters Chapter 4. Diagnostics and Troubleshooting 4.1 Scope Test and Diagnostic Functions Local Digital Loopback (Local Loop) Remote Analog Loopback (Remote Loop) Tone Injection Troubleshooting Instructions Frequently Asked Questions Technical Support VC-6A Installation and Operation Manual i

8 Table of Contents Appendix A. Connector Wiring Appendix B. Signaling Profiles ii VC-6A Installation and Operation Manual

9 Chapter 1 Introduction 1.1 Overview This manual describes the technical characteristics, applications, installation and operation of the VC-6A voice interface modules. The VC-6A modules are a family of user-programmable voice interface modules for the modular E1/T1 multiplexer systems Megaplex-2100 and Megaplex The modules provide six voice channels using one of two user-selectable voice encoding modes: Toll-quality 64 kbps PCM voice encoding in compliance with ITU-T Rec. G.711 and AT&T Pub Toll-quality 32 kbps ADPCM voice compression encoding in compliance with ITU-T Rec. G.732 and G.723 (1988), ANSI T Note VC-6A modules ordered with P option support only PCM encoding, therefore ignore all information in this manual relating to ADPCM encoding if you are using such a module. All VC-6A modules offer flexible configuration of the signaling format. The VC-6A modules maximize the Megaplex-2100 utilization: for example, a single Megaplex-2100 enclosure, operating in PCM encoding mode, can carry up to 60 voice channels over two E1 links (or up to 48 channels over two T1 links). A single compact Megaplex-2104 enclosure can carry 24 PCM voice channels over a T1 or E1 link. In ADPCM encoding mode, each pair of channels requires a single timeslot. Therefore, a single E1 link using ADPCM mode can support 60 voice channels and a single T1 link can carry up to 48 voice channels. Overview 1-1

10 Chapter 1 Introduction VC-6A Installation and Operation Manual Product Options The VC-6A modules are available in the following versions: VC-6A/E&M supports EIA RS-464 Types I, II, III and V (BT SSDC5) signaling VC-6A/FXS and VC-6A/FXO support loop-start and wink start signaling, with battery polarity reversal and pulse metering VC-6AG/FXS and VC-6AG/FXO support loop-start and ground-start signaling. Note In this manual the generic term VC-6A is used when the information is applicable to all module versions, and the term Megaplex is used when the information is applicable to both the Megaplex-2100 and Megaplex-2104 chassis types. The complete designation is used only for information applicable to a specific version. E&M Module The VC-6A/E&M module has user-selectable two-wire or four-wire analog interface, and E&M signaling. The interface is simultaneously selected for all the channels. All the six channels are terminated in a single 50-pin TELCO connector. RAD offers an adapter cable, CBL-VC16, terminated in six RJ-45 male connectors for direct connection of user's equipment. The E&M module supports four types of E&M signaling: EIA RS-464 types I, II, III and V (similar to British Telecom SSDC5). Figure 1-1 shows the equivalent signaling circuits for the different signaling modes. EIA RS-464 Type I signaling standard is supported without any external power supply. EIA RS-464 Type II, III and V (BT SSDC5) signaling standards are supported by means of the internal -12 VDC power supply of the chassis. The -12 VDC voltage is suitable for most PBX systems. However, for full support of the EIA RS-464 Type II, III and V (BT SSDC5) signaling standards, a -48 VDC signaling voltage is required. Note To connect the -48 VDC, the VC-6A/E&M must be ordered with an optional internal connector to the chassis voltage bus. See Connecting the External -48 VDC Voltage in Chapter 2 for the details on VDC power sources and connection methods. 1-2 Overview

11 VC-6A Installation and Operation Manual Chapter 1 Introduction PBX E&M Interface -48VDC M Lead Condition M E On-Hook Off-Hook GND - 48VDC Open GND - 48VDC E Lead A. RS-464 Type I PBX E&M Interface M Lead SB Lead - 48VDC Condition M/SB E/SG On-Hook Off-Hook Open - 48VDC Open GND - 48VDC E Lead SG Lead B. RS-464 Type II PBX M Lead SB Lead E&M Interface - 48VDC Condition M/SB E/SG On-Hook Off-Hook Open - 48VDC Open GND - 48VDC E Lead SG Lead C. RS-464 Type III PBX E&M Interface 1.2 kω M Lead - 48VDC Condition M E On-Hook Off-Hook Open GND Open GND - 48VDC E Lead 1.2 kω D. RS-464 Type V, SSDC5 Figure 1-1. E&M Equivalent Signaling Circuits Overview 1-3

12 Chapter 1 Introduction VC-6A Installation and Operation Manual VC-6A/E&M Application Figure 1-2 shows a basic E&M tie line extension application using VC-6A/E&M modules. E&M Tie Lines VC-6A/E&M E1/T1 VC-6A/E&M E&M Tie Lines PBX PBX MP-2100 MP-2100 FXS and FXO Modules Note Figure 1-2. Basic Application for VC-6A/E&M Modules In this application each VC-6A/E&M module supports six PBX E&M tie lines. The E1/T1 link between the Megaplex systems establishes the transmission media between the PBXs. The VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS and VC-6AG/FXO modules are used to connect regular telephone sets (and other equipment with similar interface characteristics) to central office and PBX extension lines. The six channels of the FXS and FXO modules are each terminated on a separate RJ-11 female connector for direct connection of user's equipment or PBX interface. The VC-6A/FXS module has two-wire analog interfaces and supports FXS loop-start signaling, for direct connection to subscriber telephone sets. This module also features battery polarity reversal for wink-start signaling, as well as metering pulse generation required for direct connection to payphones. The VC-6AG/FXS module has two-wire analog interfaces and supports both FXS loop-start for direct connection to subscriber telephone sets, and groundstart signaling for connection to ground-start PBXs. Both FXS modules require -48 VDC for subscriber feed voltage, which is supplied via a standard internal voltage connector from the chassis voltage distribution bus (see Connecting the External -48 VDC Voltage in Chapter 2 for details). For subscriber feed voltage, FXS modules can operate with any VDC input between -20 VDC to -56 VDC. This will be sufficient for supporting most applications. However, using input less than the nominal -48 VDC will shorten the range of the loop span. For example, -24 VDC input will only support loop spans which do not exceed 1 km. The VC-6A/FXO module has two-wire analog interfaces and supports FXO loop-start signaling for direct connection to PBX extension lines. This module also features battery polarity reversal for wink-start signaling, as well as metering pulse detection required for payphone applications. The VC-6AG/FXO module has two-wire analog interfaces and supports both FXO loop-start and ground-start signaling for direct connection to loop/ground-start PBX extension lines. 1-4 Overview

13 VC-6A Installation and Operation Manual Chapter 1 Introduction Loop-Start Application (all VC-6A modules) In general, FXS and FXO modules are intended for operation in a link, with the FXO module on the central office/pbx side, and the FXS module on the subscriber side, however FXS modules can also operate in a link with E&M modules. In a typical application (see Figure 1-3), one FXO module is used in a link with a FXS module to provide an off-premises extension (OPX). This configuration permits the connection of a remote telephone as an extension of a PBX. The remote telephone then becomes a regular local PBX subscriber, which can be dialed by other subscribers using standard procedures, and can also dial any other PBX subscriber. Extension Lines VC-6A/FXO E1/T1 Ringer-2100R VC-6A/FXS PBX MP-2100 MP-2100 Figure 1-3. OPX Application for FXO and FXS Modules Another application, which requires only FXS modules, is the private line with automatic ringdown (PLAR) or hot-line applications. In PLAR or hot-line applications, telephone sets are connected to the channels of FXS modules installed in two different Megaplex units that are connected in a link, as shown in Figure 1-4. Each local/remote pair of telephones can then communicate via the Megaplex link without dialing: when one telephone goes off-hook, the other telephone rings. Ringer-2100R Ringer-2100R E1/T1 VC-6A/FXS VC-6A/FXS MP-2100 MP-2100 Figure 1-4. PLAR Application for FXS Modules Due to flexible signaling configuration capabilities, the FXS and FXO modules can also be used in links ending in the public switched telephone network (PSTN), such as the typical application shown in Figure 1-5. In this application, PSTN subscribers can dial directly to the subscribers connected to the FXS module installed in the Megaplex unit. Overview 1-5

14 Chapter 1 Introduction VC-6A Installation and Operation Manual Extension Lines VC-6A/FXO E1/T1 Trunk Line Public Switched Telephone Network (PSTN) PBX MP-2100 Subscribers Figure 1-5. PSTN Application for FXO Modules Wink-Start Application (VC-6A/FXS and VC-6A/FXO only) VC-6A/FXS and VC-6A/FXO supports battery voltage polarity reversal for wink-start signaling, which is used in direct inward dialing (DID) applications. These modules can be used for trunk extension between Central Office switching equipment that use wink-start signaling, and remote PBXs (see Figure 1-6). In such an application, the VC-6A/FXS and VC-6A/FXO modules operate in a link, with the VC-6A/FXS module on the Central Office switching equipment side, and the VC-6A/FXO module on the remote PBX side. Central Office VC-6A/FXS E1/T1 VC-6A/FXO Switching Equipment using wink-start MP-2100 MP-2100 PBX using wink-start Figure 1-6. Wink-Start Trunk Extension for DID Application using VC-6A/FXO and VC-6A/FXS Modules Note Battery voltage polarity reversal is not supported when using ADPCM compression mode by systems with E1 links. Payphone Application (VC-6A/FXS and VC-6A/FXO only) The VC-6A/FXS module provides 12/16 khz metering pulse generation for direct connection to public payphones, while the VC-6A/FXO module provides 12/16 khz metering pulse detection. In a typical application (see Figure 1-7), a VC-6A/FXO module is used in a link with a VC-6A/FXS module to provide an off-premises extension (OPX) of public payphones. This configuration permits the connection of a remote payphone telephone as an extension of a PBX. The remote payphone then becomes a regular local PBX subscriber, which can be dialed by other subscribers using standard procedures, and can also dial any other PBX subscriber, while transferring the metering signaling for billing purposes. 1-6 Overview

15 VC-6A Installation and Operation Manual Chapter 1 Introduction Ringer-2100R FXO E1/T1 FXS VC-6A/FXO VC-6A/FXS PBX using pulse metering MP-2100 MP-2100 Public Payphones Figure 1-7. Payphone Application using VC-6A/FXO and VC-6A/FXS Modules Note Metering pulse generation/detection is not supported when using ADPCM compression mode by systems with E1 links. Ground-Start Application (VC-6AG/FXS and VC-6AG/FXO only) While loop-start signaling is the typical method used by residential telephones, the ground-start method is commonly used between PBXs and the Central Office (CO) switching equipment. The ground-start method is used to avoid ingoing/outgoing call conflicts between customer voice systems which use loop-start signaling, and the CO equipment over the use of shared trunks. In a basic application, two VC-6AG/FXO modules can be used to connect between trunks from ground-start PBXs (see Figure 1-8). VC-6AG/FXO E1/T1 VC-6AG/FXO PBX using ground-start MP-2100 MP-2100 PBX using ground-start Figure 1-8. Ground-Start Trunk Extension Application using VC-6AG/FXO Modules In the ground-start application shown below in Figure 1-9, the VC-6AG/FXS and VC-6AG/FXO modules operate in a link, with a VC-6AG/FXO module on the PBX/CO side connected to the PBX (which is connected to CO switching equipment that uses ground-start signaling). In this application, a VC-6A/FXS module on the subscriber side connects telephones using loop-start signaling, while another VC-6AG/FXS module is used for connection to a PBX that is configured as FXO, for ground-start trunk extension. Central Office Telephones using loop-start Ringer-2100R FXS Switching Equipment using ground-start FXO VC-6AG/FXO E1/T1 VC-6AG/FXS PBX using ground-start (configured as FXS) MP-2100 MP-2100 PBX using ground-start ( configured as FXO) Figure 1-9. Combined Loop-Start and Ground-Start Application, using VC-6AG/FXO and VC-6AG/FXS Overview 1-7

16 Chapter 1 Introduction VC-6A Installation and Operation Manual Unidirectional and Broadcast Applications In addition to the normal (bidirectional) mode of operation, the VC-6A modules support the unidirectional and broadcasting modes. These modes can be used in Megaplex-2100 and Megaplex-2104 units equipped with two main links, operating in the dual-link mode. Unidirectional Mode Applications The unidirectional mode, supported by the E&M and FXS modules, enables a user at a central location to send messages to users connected to remote Megaplex-2100/Megaplex-2104 units (simplex communication), while using only one main link timeslot. In this mode, any message is simultaneously heard by all the unidirectional users, but none of them can answer. This capability is achieved by separating the handling of the receive and transmit paths in the timeslot assigned for the unidirectional channels, as shown by the dashed lines within the Megaplex-2100 unit at location B in Figure This figure shows a simple system configuration. The figure shows only one Megaplex-2100 unit (location B) with a VC-6A channel configured for the unidirectional mode and assigned a timeslot on link A, but the number of such units is not limited. Location A VC-6A (Bidirectional Mode) Location B VC-6A (Bidirectional Mode) Location C MP-2100 VC-6A (Unidirectional Mode) MP-2100 MP-2100 (Receive only) Figure Typical Unidirectional Application for VC-6A Modules In this application, the user at the central location (A) is connected to a VC-6A channel configured for operation in the normal (bidirectional) mode. The timeslot assigned to user A is routed to the desired main link, and the channels of the other users (e.g., at location B) are configured for the unidirectional mode, and routed to the same timeslot on the main link connected to the Megaplex-2100 at location A (e.g., to link A). In the forward path (from location A), the timeslot assigned to the VC-6A channel configured for unidirectional operation is automatically bypassed to the timeslot with the same number on link B, and in addition is routed to the receive path of the unidirectional channel. Therefore, the transmit signal of user A is relayed to the following units, and the user B hears user A. In the reverse path (to location A), the timeslot is always bypassed from link B to link A. To prevent interference from the unidirectional channel, its transmit 1-8 Overview

17 VC-6A Installation and Operation Manual Chapter 1 Introduction path is always disconnected from the main link timeslots (at location B, no information is inserted in the timeslot bypassed from link B to link A), and user B cannot speak with any other user. In addition to allowing all the users attached to unidirectional channels receive its messages, the user can also communicate in the full duplex mode with one additional user, configured for operation in the normal mode (this is illustrated by the user at location C). Broadcast Mode Applications The broadcast mode, supported by E&M and FXS modules, enables a user at a central location to communicate in full duplex with several users connected to remote Megaplex-2100/Megaplex-2104 units (simplex communication), while using only one main link timeslot. As in the unidirectional mode, any message from user A can be simultaneously heard by all the broadcast mode users, but at any time only one of these users can be heard by user A. The broadcast capability is achieved by separating the handling of the receive and transmit paths in the timeslot assigned for the broadcast channels, as shown by the dashed lines within the Megaplex-2100 units in Figure Location A Location Y VC-6A (Bidirectional Mode) Location B Location X VC-6A (Bidirectional Mode) MP-2100 MP-2100 MP-2100 MP-2100 VC-6A (Broadcast Mode) VC-6A (Broadcast Mode) Figure Typical Bi-directional Application for VC-6A/E&M Modules Figure 1-11 shows a basic system configuration. The figure shows only two Megaplex-2100 units (locations B and X), each with a VC-6A channel configured for the broadcast mode and assigned a timeslot on link A, but the number of such units is not limited. Overview 1-9

18 Chapter 1 Introduction VC-6A Installation and Operation Manual In this application, the handling of the signals generated by user A is similar to that for the unidirectional mode described above. The difference is that each broadcast user can insert its signal in the receive timeslot of link A (instead of the signal bypassed from link B): the change in routing is controlled by the M signal for VC-6A/E&M modules, or by the off-hook/on-hook detector for VC-6A/FXS modules: When the M signal is not active (idle, or on-hook, state), the receive timeslot is bypassed from link B to link A, and continues toward user A. When the M signal is active (off-hook state), the receive timeslot of link B is disconnected from link A, and the transmit path of the local broadcast user is connected to link A. Thus, user A can request any user to answer, and that user can lift the handset and connect to user A. At any time, only one user can speak with user A (if more than one user answers, only the user closer to location A will actually be heard). 1.2 Physical Description The VC-6A modules, 4U in height, occupy one module slot in the Megaplex chassis. Figure 1-12 shows typical panels of VC-6A modules. Table 1-1, Table 1-2, and Table 1-3 detail the functions of the components located on the module panels. VC-6A E&M REM O.H Indicator (per channel) REM O.H CH-1 VC-6A FXO RING RING Indicator (per channel) REM CALL CH-1 VC-6A FXS LOC O.H M Indicators (per channel) CH M E E Indicators (per channel) REM O.H CH-2 REM O.H RING RING REM CALL Indicator (per channel) REM CALL CH-2 REM CALL LOC O.H LOC O.H LOC O.H Indicator (per channel) CH-3 REM O.H RING Voice Channel Connectors (per channel) CH-3 REM CALL LOC O.H CH-4 CH-4 Voice Channel Connector (for all channels) REM O.H CH-5 RING REM CALL CH-5 LOC O.H REM O.H RING REM CALL LOC O.H CH-6 CH-6 VC-6A/E&M VC-6A/FXO, VC-6AG/FXO Figure VC-6A Module Panels VC-6A/FXS, VC-6AG/FXS 1-10 Physical Description

19 VC-6A Installation and Operation Manual Chapter 1 Introduction Table 1-1. VC-6A/E&M Modules, Panel Components Item M Indicator (per channel) E Indicator (per channel) TELCO Connector Description Lights when the M line of the corresponding channel is off-hook (channel in use) Lights when the E line of the corresponding channel is off-hook (channel in use) 50-pin female TELCO connector, for connection of all voice channels Table 1-2. VC-6A/FXO and VC-6AG/FXO Modules, Panel Components Item REM O.H Indicator (per channel) RING Indicator (per channel) RJ-11 Connector (per channel) Description Lights when the remote subscriber of the corresponding channel is off-hook (busy) Lights when ringing is received on the corresponding channel RJ-11 female connector for connection to the voice channels. Connector pin assignments and functions are given in Appendix A. Table 1-3. VC-6A/FXS and VC-6AG/FXS Modules, Panel Components Item REM CALL Indicator (per channel) LOC O.H Indicator (per channel) RJ-11 Connector (per channel) Description Lights when a call initiated by the remote subscriber is being handled by the corresponding channel (channel is busy) Lights when the local subscriber of the corresponding channel is off-hook (busy) RJ-11 female connector for connection to the voice channels. Connector pin assignments and functions are given in Appendix A. Audio Performance 1.3 Functional Description All the VC-6A modules provide six high-quality voice channels (the functional difference between the various modules being in the signaling interface and mode). The analog interface for the VC-6A/E&M version is user-selectable for 2-wire or 4-wire; for the other versions, a 2-wire interface is always used. Voice encoding method for all module versions, is user-selectable for either toll-quality 64 kbps PCM in compliance with ITU-T Rec. G.711 and AT&T Pub or 32 kbps ADPCM in compliance with ITU-T Rec. G.732 and G.723 (1988), ANSI T Functional Description 1-11

20 Chapter 1 Introduction VC-6A Installation and Operation Manual Note VC-6A modules ordered with P option support only PCM encoding, therefore ignore all information in this manual relating to ADPCM encoding if you are using such a module. Timeslot Assignment The user can select the companding law, µ-law or A-law, in accordance with system requirements. To increase application flexibility, the nominal audio transmit and receive levels of all the module versions can be adjusted over a wide range. Due to the high quality audio reproduction, DTMF signaling is transparently transferred, inband. Therefore, the user can use DTMF signaling as usual, e.g., can operate the telephone set keypad to access voice mail systems, interactive systems, etc. In addition, the VC-6A versions are offered with several signaling interfaces, that is, in the method used to interchange signaling between the local equipment connected to a module channel and the channel interface, in accordance with the applicable standards. The VC-6A modules require one aggregate timeslot per voice channel in PCM mode, or one timeslot per pair of voice channels in ADPCM mode. This means that ten VC-6A modules can be installed in a single Megaplex-2100 enclosure, to support a maximum of 60 PCM voice channels using two E1 links. In ADPCM mode, only one E1 link is required to support the 60 voice channels. For a T1 system, up to 48 voice channels can be supported over two links with PCM mode, or over a single link with ADPCM mode. Alternatively, if a dual-link ML-2E1 or ML-2T1 module is used, 11 VC-6A modules can be installed in the remaining slots to allow a single Megaplex-2100 enclosure to support up to 66 ADPCM voice channels (requiring 33 timeslots total) over two E1 or T1 links. The maximum number of modules in a Megaplex-2104 enclosure is four, corresponding to 24 voice channels using 24 timeslots in PCM mode. In ADPCM mode, supporting the same quantity of channels requires only 12 timeslots. The nominal input and output levels are individually adjustable in a wide range, enabling easy integration in all environments. The main link bandwidth required by a VC-6A module depends on the encoding method, PCM or ADPCM: With PCM encoding, the VC-6A modules require one main link timeslot, per voice channel, and provide the data in a DS-0 (8-bits) compatible format, permitting voice channel switching in a DACs-based cross-connect system. With ADPCM encoding, the VC-6A module requires only one main link timeslot for each pair of voice channels. Note that consecutive channels (e.g. CH 1 2, 3 4, or 5 6) must be assigned to share the same timeslot). The Megaplex system enables the user to select the main link that will carry the VC-6A channels. For this purpose, the user can specify the main link module (ML Slot) and port (ML Channel) desired Functional Description

21 VC-6A Installation and Operation Manual Chapter 1 Introduction Handling of Signaling Information The VC-6A modules offer flexible configuration of signaling mode and signaling format, down to the level of the individual bits in the channel signaling information word. Transfer of Signaling Information The user can select the format of the signaling information generated by VC-6 modules in accordance with the application requirements. The signaling information of each channel is carried by means of up to four bits (signaling bits), designated by the applicable standards as bits A, B, C, and D. The number of bits actually available for carrying signaling information, and the data rate at which signaling information can be transferred depend on the main link type (E1 or T1), the framing mode and the encoding type (PCM or ADPCM) being used. Refer to the Megaplex-2100 System Installation and Operation Manual for additional information. As explained in Megaplex-2100 System Installation and Operation Manual, the number of bits available for the transfer of channel-associated signaling of each payload timeslot is as follows: For E1 trunks with G.732S framing (16-frame multiframe), timeslot 16 carries four signaling bits for each payload timeslot. No signaling bits are present in the G.732N mode. In ADPCM mode two signaling bits are available for each channel. For T1 trunks with ESF framing (24-frame multiframe), the multiframe structure includes four signaling bits for each payload timeslot. In ADPCM mode two signaling bits are available for each channel. For T1 trunks with SF (D4) framing (12-frame multiframe), the multiframe structure includes two signaling bits for each payload timeslot. In ADPCM mode only one signaling bit is available for each channel. For your convenience, Table 1-4 lists the number of signaling bits as a function of voice encoding and framing method. Table 1-4. Number of Available Signaling Bits Voice Signaling Type E1 Main Link T1 Main Link Encoding G.732S G.732N ESF SF (D4) PCM CAS 4 Not supported Not supported Not supported Robbed Bit Multiframe (RBMF) Not supported Not supported 4 2 Robbed Bit Frame (RBF) ADPCM CAS 2 Not supported Not supported Not supported Robbed Bit Multiframe (RBMF) Not supported Not supported 2 1 Functional Description 1-13

22 Chapter 1 Introduction VC-6A Installation and Operation Manual Signaling Modes The VC-6A modules have two categories of signaling modes with respect to encoding mode selected: Signaling for PCM Channel Associated Signaling (CAS) transmitted in timeslot 16, compatible with ITU-T Rec. G.704. This mode is available on VC-6A modules installed in systems using E1 main links only, and therefore is generally used with A-law companding, in accordance with the applicable E1 standards. CAS can be used only when the main link framing format is G.732S. Inband Robbed Bit Multiframe (RBMF) signaling transfer. Available for VC-6A modules installed in systems using T1 main links only, this method is compatible with ITU-T Rec. G.704 and AT&T Pub , and is generally used with µ-law companding, in accordance with the applicable T1 standards. Proprietary Robbed Bit Frame (RBF) signaling, applicable for both A-law and µ-law encoding, which avoids the need for multiframe synchronization. This method allocates the least significant bit of each channel to its own signaling information. Therefore, signaling is transparently transferred within the timeslot carrying the encoded audio signal, but because PCM encoding is effectively done with 7-bit resolution, there is a slight decrease in transmission quality. This proprietary method allows the transmission of 31 voice channels by a Megaplex system with E1 links, even when using G.732N framing. No Signaling transmits no signaling information, and therefore it is suitable for applications which do not need end-to-end signaling, or can use only in-band signaling, e.g., DTMF. Signaling for ADPCM The signaling is slightly different when using ADPCM voice encoding: E1 used as main link timeslot 16 consists of four bits A, B, C, D (as in PCM) for a specific timeslot. However, since in ADPCM mode each channel requires only half a timeslot, the first two bits serve the first channel and the last two bits serve the second channel. A B A B A B A B CH1 TS1 CH2 CH1 CH2 TS Functional Description

23 VC-6A Installation and Operation Manual Chapter 1 Introduction T1 used as main link - The A, B, C and D bits of each channel are transmitted through the following frames: ESF Framing: 6,12,18 and 24. Each channel has two signaling bits. SF Framing: 6 and 12 only. Each channel has a single signaling bit. A A B B CH1 CH2 CH1 CH2 Frame 6 Frame 12 Frame 18 Frame 24 In ESF Mode Only For your convenience, Table 1-5 lists the signaling types supported in the various main link framing modes: OK means that the corresponding type is the type specified by the applicable standards. Warning means that the corresponding type is supported, but is not in accordance with the applicable standards, and therefore can only be used when Megaplex systems are located at both ends of the link. In this case, the system generates a warning message. Error means that the corresponding type is not supported. In this case, the system generates an error message. Table 1-5. Signaling Modes Signaling Type E1 Main Link T1 Main Link G.732S G.732N ESF SF (D4) No Signaling OK OK OK OK Robbed Bit Multiframe (RBMF) Error Error OK OK CAS OK Error Error Error Robbed Bit Frame (RBF) Warning Warning Warning Warning Signaling Profiles The format of the signaling information is defined for the VC-6A by selecting one of six predefined profiles. The profile defines the information carried by each signaling bit transmitted by the module channel, and the signaling bit read by the receive path (normally the bits at both ends of a link are used in a similar way, however the signaling mechanism of the VC-6A modules provides flexibility in the selection of the received bit). The profile defines the information carried by each signaling bit transmitted by a voice channel, and the interpretation of each signaling bit. The selections for the receive path may differ from the transmit path to support the conversion of signaling formats. Functional Description 1-15

24 Chapter 1 Introduction VC-6A Installation and Operation Manual Note In the transmit path, each of the signaling bits can carry the following information: State of M lead Inverted state of M lead Forced to either 0 or 1 Metering Polarity reversal detection Any signaling bit can also be disconnected (not transmitted to the remote end). In the receive path the state of the E lead can be determined by any signaling bit (inverted or non-inverted), or the E lead can be forced to idle. Signaling profiles can also be selected, as well as manually defined, at the System level. This signal profile is used by the Megaplex main link (e.g. ML-2E1) modules. Changing the default transparent profile setting of the main link module will alter the final signaling bit definition from what was selected in the VC-6A module. Therefore, to ensure that the signaling bits are actually transmitted according to the VC-6A s profile definition, verify that: The main link module s Sig.Profile parameter is set for the default 1 ( transparent ). See the appropriate main link Installation and Operation Manual for details. The System s Profile 1 default Rx/Tx Translation has not been changed (i.e. A=A, B=B, etc.). See DEF PROFILE command in the Megaplex-2100/2104 System Installation and Operation Manual for details. For Megaplex systems operating with T1 links, to use VC-6A modules in either Profile 1 or Profile 2, changes must be made to the ML-2T1 module s signaling profile configuration. For details, see Appendix B. VC-6A currently supports six profiles: Profile 1 is intended for use when two E&M modules are connected in a link (a typical application of this type is shown in Figure 1-2), when an FXS module is connected in a link with an FXO module (a typical application of this type is shown in Figure 1-3); when an E&M module is connected in a link with an FXS or FXO module; or when two FXS modules are connected in a link (a typical application of this type is shown in Figure 1-4). Profile 2 is used to enable connection of FXO or FXS modules to T1 trunks ending in the PSTN (a typical application of this type is shown in Figure 1-5), however FXO modules using profile 2 can also be connected to FXS modules using profile 2. Profile 2 is supported by systems with T1 links only. It is not supported by E&M modules. Profiles 3R, 3M and 3RM are used with the VC-6A/FXS or VC-6A/FXO modules which are equipped with dedicated circuitry for generating/detecting battery polarity reversal to connect to exchanges using wink-start signaling (see Figure 1-6), and 12/16 khz metering pulses for serving payphones (see Figure 1-7). These profiles support both transfer of call control signaling information and the metering information for billing: 1-16 Functional Description

25 VC-6A Installation and Operation Manual Chapter 1 Introduction Note 3R for Reverse battery polarity signal transfer 3M for Metering pulse (16/12 khz) generation/detection signal transfer 3RM for both battery polarity reversal, and 16/12 khz metering pulse generation/detection signal transfer Profiles 3R, 3M and 3RM are not supported by VC-6A/E&M or VC-6AG modules. These profiles are not supported when using ADPCM compression mode by systems with E1 links. Profile 4 This profile is mostly used with special exchanges and central office equipment. Profile 4 is not supported when using ADPCM compression mode. For your convenience, the signaling profiles information, including a summary of profile compatibility, is detailed in Appendix B at the end of this manual. OOS Signaling In case the communication between modules located in different Megaplex units fails, e.g., because loss of synchronization, etc., it is necessary to control the state of the signaling information at the two ends of the link. This activity, called out-of-service (OOS) signaling, can be selected in accordance with the specific application requirements, on a per-channel basis. The OOS signaling options supported by the VC-6A/E&M modules are as follows: Signaling forced to the idle state for the duration of the out-of-service condition (forced idle). Signaling forced to the busy state for the duration of the out-of-service condition (forced busy). Signaling forced to the idle state for 2.5 seconds, and then changed to the busy state for the remaining duration of the out-of-service condition (idle-busy). Signaling forced to the busy state for 2.5 seconds, and then changed to the idle state for the remaining duration of the out-of-service condition (busy-idle). The FXO modules support the forced-idle, forced-busy and idle-busy options only. The FXS modules support the forced-idle option only. Configuration and Management All the VC-6A modules operating parameters (excluding the VC-6A/E&M signaling type) are controlled by means of the Megaplex system management. Test and Diagnostic Capabilities The VC-6A module automatically performs self-test upon power-up and during normal operation. For diagnostics purposes, each module channel has indicators that indicate its state, e.g., the state of the E and M lines for the VC-6A/E&M version, and thus Functional Description 1-17

26 Chapter 1 Introduction VC-6A Installation and Operation Manual enable the user to check for proper response to the state of its telephone set or equipment. The diagnostic features include: Local digital loopback per channel (in PCM) or per pair of channels (in ADPCM) towards local analog side. Remote analog loopback per channel towards remote side. 1 khz, 0 dbm0, tone injection on a channel towards remote side. Using this function in conjunction with the loopback functions enables the user to check rapidly and efficiently the local equipment and its connection to the module channel. Only one Tone Inject operation can be active on a module at the same time. The user can request that a loopback (or the test tone injection) is automatically deactivated after a user-selected interval, thereby reducing the management workload during system troubleshooting. 1.4 Technical Specifications Number of Channels Bandwidth Requirements Voice Encoding Technique Analog Interface Analog Parameters PCM ADPCM Modulation Technique Companding Line Type ITU-T Recommendations Nominal Level Nominal Impedance Return Loss (ERL) at 300 to 3400 Hz Frequency Response (Ref: 1020 Hz) 6 64 kbps per enabled channel (one timeslot) 32 kbps per enabled channel (one timeslot per pair of channels) PCM: per ITU-T Rec. G.711 and AT&T Pub ADPCM: per ITU-T G.726 µ-law or A-law (soft-selectable) E&M: 4-wire or 2-wire (soft-selectable) FXS, FXO: 2-wire 2-wire: ITU-T Rec. G wire: ITU-T Rec. G.712, G dbm 600 Ω Better than 20 db 0 db ±0.5 db, at 300 to 3000 Hz 0 db ±1.1 db, at 250 to 3400 Hz 1-18 Technical Specifications

27 VC-6A Installation and Operation Manual Chapter 1 Introduction Level adjustment (soft-selectable) E&M TX: +8 to -17 dbm RX (2-wire): +2 to -23 dbm RX (4-wire): +2 to -17 dbm without amplification +8 to -17 dbm with amplification FXS TX: +8 to -13 dbm RX: +2 to -17 dbm FXO TX: +7 to -18 dbm RX: +1 to -23 dbm Steps Signal to Total Distortion (8-bit PCM encoding) Idle Channel Noise Transformer Isolation E&M Interface Signaling method (user-selectable) Pulse dial distortion 0.5 db (±0.15 db), nominal ITU-T Rec. G.712, G.713 Method 2: 0 to -30 dbm0: better than 33 db +3 to -45 dbm0: better than 22 db Better than -65 dbm0 (+20 dbrnc) 1500 VRMS EIA RS-464 E&M Type I EIA RS-464 E&M Type II, III and V (British Telecom SSDC5) using internal -12 VDC in place of -48 VDC Note: For full support of Types II, III, and V (SSDC5) signaling standards, a -48 VDC supply is required. To support this, an optional 3-pin connector on the module panel, or an optional internal connector to the chassis voltage bus must be ordered. ±2 msec max FXS Interface Signaling methods VC-6A/FXS: EIA-RS-464 loop-start and wink-start VC-6AG/FXS: EIA-RS-464 loop-start and ground-start On-hook/Off-hook threshold (where V in = -20 VDC to -56 VDC) 3V to 80% V in between Tip and Ring at Off-Hook state Higher than 83% V in between Tip and Ring at On-Hook state Feed current 22 ma (±10%) Ringer 86 VRMS (when providing 4 REN or less) to 45 VRMS (when providing 12 REN max), 20 Hz (±10%); Overload protected, 1 second ON, 3 seconds OFF Technical Specifications 1-19

28 Chapter 1 Introduction VC-6A Installation and Operation Manual VC-6A/FXS only Metering pulse generation Output Level Reversal polarity pulse distortion Output frequency: +12 or 16 khz (±2 Hz), user-selectable 1.7 VRMS 6 msec max FXO Interface Signaling methods VC-6A/FXS: EIA-RS-464 loop-start and wink-start End-to-end Signaling DC impedance Ring detector VC-6A/FXO only Metering pulse detection frequency Reversal polarity pulse distortion T1 main links VC-6AG/FXS: EIA-RS-464 loop-start and ground-start Off-hook: 100 Ω at 100 ma feed, 230 Ω at 25 ma feed On-hook: above 1 M Ω Hz, 70 VRMS Detection: At least 20 VRMS, 17 to 25 Hz No detection: Maximum 5 VRMS +12 or 16 khz (±2 Hz), user-selectable 6 msec max Robbed Bit Multiframe (RBMF) signaling: 667 samples per second with SF (D4) framing; 333 samples per second with ESF framing Proprietary Robbed Bit Frame (RBF) signaling: 8000 samples per second No Signaling E1 main links Channel Associated Signaling per ITU-T Rec. G.704, para Proprietary Robbed Bit Frame (RBF) signaling: 8000 samples per second No Signaling 1-20 Technical Specifications

29 VC-6A Installation and Operation Manual Chapter 1 Introduction Diagnostics Local digital loopback for each channel (in PCM) or pair of channels (in ADPCM), towards the local user equipment Remote analog loopback for each channel, towards the remote user equipment 1 khz, 0 dbm0 test tone inject for one channel at a time, towards the remote user equipment Self test for entire system upon power-up Indicators (per channel) E&M FXS FXO E-lead, M-lead Remote Call, Local Off-Hook Ring Detect, Remote Off-Hook Connectors E&M Single 50-pin TELCO connector (for all channels) Configuration FXS, FXO Six 6-pin RJ-11 connectors (one per channel) Programmable via the system management Technical Specifications 1-21

30 Chapter 1 Introduction VC-6A Installation and Operation Manual 1-22 Technical Specifications

31 Chapter 2 Installation and Setup 2.1 Introduction This chapter provides installation and operation instructions for the various VC-6A modules. The information presented in this chapter supplements the general Megaplex-2100 installation, configuration and operation instructions contained in the Megaplex-2100 Installation and Operation Manual. Warning Note Before performing any internal settings, adjustment, maintenance, or repairs, first disconnect all the cables from the module, and then remove the module from the Megaplex enclosure. No internal settings, adjustment, maintenance, and repairs may be performed by either the operator or the user; such activities may be performed only by a skilled technician who is aware of the hazards involved. Always observe standard safety precautions during installation, operation, and maintenance of this product. The VC-6A modules contain components sensitive to electrostatic discharge (ESD). To prevent ESD damage, always hold the module by its sides, and do not touch the module components or connectors. 2.2 Setting Internal Jumpers and Switches VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS, and VC-6AG/FXO module versions do not include any internal user settings, and all their functions are programmable. The VC-6A/E&M module version has several internal switches, which are used to select the signaling mode. The signaling mode is simultaneously selected for all the channels. Table 2-1 lists the required switch settings. In addition, a set of jumpers (S1-S7) enables the user to amplify the channels Receiver level, when operating with 4-wire interface. Table 2-2 lists the required jumper settings. Figure 2-1 identifies the positions of the module s user-selectable components. Setting Internal Jumpers and Switches 2-1

32 Chapter 2 Installation and Setup VC-6A Installation and Operation Manual S1 ADPCM Sub-board (not installed on P option modules) SW1 SW2 ON SW3 S2 S3 F4 F5 OFF F6 F7 S5 S4 S6 RX Amplification S1, S2, S3, S4, S5, S6, S7 OFF Default F8 F9 F10 F11 S1, S2, S3, S4, S5, S6, S7 ON For 4-Wire only F12 F13 S7 F14 F15 Figure 2-1. VC-6A/E&M Module, Internal Settings Table 2-1. Selection of E&M Signaling Mode Signaling Mode Switch SW1 Switch SW2 Switch SW3 RS-464 Type I ON ON ON RS-464 Type II ON OFF ON RS-464 Type III ON ON ON RS-464 Type V OFF OFF OFF BT SSDC5 OFF OFF OFF The E&M module signaling mode is factory-set for RS-464 Type V / BT SSDC5. Table 2-2. Selection of Channels RX Level Amplification (VC-6A/E&M 4-wire only) Jumper No. State Amplification S1, S2, S3, S4, S5, S6, S7 ON OFF +8 dbm +2 dbm Note All Jumpers must be in the same position. If 2-wire interface is used, all the amplification jumpers must be set to OFF. To configure the VC-6A/E&M module: 1. Select the signaling mode as required according to Table Set the channels RX amplification as required according to Table Setting Internal Jumpers and Switches

33 VC-6A Installation and Operation Manual Chapter 2 Installation and Setup 2.3 Inserting the Module into Enclosure Refer to the system installation plan, and insert the module in the assigned I/O slot of the Megaplex enclosure. The module starts operating as soon as it is plugged into an operating enclosure. 2.4 Connecting the Cables Connecting the Voice Channels For the VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS, and VC-6AG/FXO modules, the voice channels are terminated on a separate RJ-11 female connector for each channel. Connector pin assignment is described in Appendix A. For the VC-6A/E&M module, all the voice channels are terminated on a single TELCO 50-pin female connector. Connector pin assignment is described in Appendix A. You may either connect a cable prepared in accordance with Appendix A to the TELCO connector of the module, or use an adapter cable for direct connection to the equipment using the voice channels. A suitable cable, designated CBL-VC16, is available as an option from RAD: this cable has a mating TELCO 50-pin connector for connection to the module, and six RJ-45 male connectors (one for each channel) for direct connection to the user's equipment. Cable length is 1.5 meters (5 feet). Connecting the External -48 VDC Voltage Note The external -48 VDC feed voltage can be supplied to the VC-6A/E&M, VC-6A/FXS, or VC-6AG/FXS modules from the following sources: Internal DC voltage distribution the module receives the required voltage via an internal connector to the chassis voltage distribution bus. The chassis receives the DC voltages either from an appropriate DC power supply, an installed Ringer-2100R/3000R module (Megaplex-2100), or a built-in ringer option (Megaplex-2104 only). No external cable connections are required. Internal DC voltage distribution via external connection to chassis (Megaplex-2100 only) the module receives the required voltage via an internal connector to the chassis voltage distribution bus, as in the method described above. The chassis receives the DC feed voltage externally (for example, from a Ringer module/standalone unit) via a cable connected to the dedicated 3-pin RINGER-IN connector on the chassis power supply module. For subscriber feed voltage, FXS modules can operate with any VDC input between -20 VDC to -56 VDC. This will be sufficient for supporting most applications. However, using input less than the nominal -48 VDC will shorten the range of the loop span. For example, -24 VDC input will only support loop spans which do not exceed 1 km. To connect the -48 VDC, VC-6A/E&M modules must be ordered with an optional internal connector to the chassis voltage bus. Connecting the Cables 2-3