INSTALLATION AND OPERATION MANUAL KHS.1 2-Channel High-Speed Data Module Kilomux I/O Module The Access Company
KHS.1 2-Channel High-Speed Data 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 KHS.1 and any software components contained therein are proprietary products of RAD protected under international copyright law and shall be and remain solely with RAD. KHS.1 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 KHS.1. 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 KHS.1, based on or derived in any way from the KHS.1. Your undertaking in this paragraph shall survive the termination of this Agreement. This Agreement is effective upon your opening of the KHS.1 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 KHS.1 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 Street Tel Aviv 69719, Israel Tel: 972-3-6458181 Fax: 972-3-6498250, 6474436 E-mail: market@rad.com North America Headquarters RAD Data Communications Inc. 900 Corporate Drive Mahwah, NJ 07430, USA Tel: (201) 5291100, Toll free: 1-800-4447234 Fax: (201) 5295777 E-mail: market@radusa.com 1988 2008 RAD Data Communications Ltd. Publication No. 420-203-02/08
Contents Chapter 1. Introduction 1.1 Functional Description...1-1 1.2 Technical Specifications...1-3 Chapter 2. Installation and Operation 2.1 General...2-1 2.2 Installation...2-1 Rear Panel...2-1 Internal Settings...2-1 Channel Interface Selection...2-3 Changer Board Setting Procedure...2-3 Module Installation...2-3 Cable Connections...2-3 2.3 Configuration...2-4 Introduction...2-4 Configuration Instructions...2-5 Inclusion of KHS.1 Module in Database...2-5 Selection of Main Link and Priority (Kilomux-2000/2100 only)...2-5 Channel Configuration...2-7 Channel Parameters...2-8 Considerations in the Selection of the CTS and RTS_CTS_DEL Parameters...2-9 Chapter 3. Alarms and Diagnostics 3.1 General...3-1 3.2 Alarm Messages...3-1 3.3 Diagnostics...3-2 Test Types...3-2 Local Channel Loop...3-2 Remote Channel Loop...3-3 Control Signal Loop...3-3 CCITT Rec. V.54 Loops...3-4 PRBS Transmission...3-6 BERT Testing...3-6 Recommended Test Sequence...3-7 Appendix A. Connection Data KHS.1 i
Table of Contents Installation and Operation Manual ii KHS.1
Chapter 1 Introduction 1.1 Functional Description The KHS.1 module is a high-speed data module for RAD s family of high-speed modular TDM systems, the Kilomux (which includes the following four models: KM- 2000, KM-2004, KM-2100 and KM-2104). The module provides two high-speed synchronous data channels. Each channel can support data rates of 32, 48, 56, 64, 128, 192, 256 or 384 kbps, however the maximum data rate may be limited by the data rate of the Kilomux main link. The channel interface is DCE, and can be independently configured for V.35, RS-530, V.36/RS-422/RS-499 or X.21 operation. Channel data rates as well as all the channel operating parameters are controlled through the Kilomux supervisory port. Programmable timing modes and channel buffers permit connection to all types of digital lines, including digital data services, and ensure data integrity. Each channel has three user-programmable timing modes: DCE: the KHS.1 channel provides the timing signals to the DTE connected to it. DTE1: the KHS.1 channel provides the receive timing signal, and accepts the transmit timing from the equipment connected to the channel. DTE2: the KHS.1 channel accepts the receive and transmit timing signals from the equipment connected to the channel, and buffers and retimes the incoming data. When connected to the national network or to private carrier data lines, e.g., DDS or Kilostream lines, a KHS.1 channel operating in the DTE2 mode can be used as an external timing reference source for the Kilomux unit the module is installed in. The KHS.1 module provides two user-selectable modes of support for the V.24/RS-232 interface control signals: Local control signal support. When local support is enabled, the channel locally supports four interface control signals, that is, the state of the control signals is not transmitted to the remote channel. The locally-supported control signals are as follows: RTS. CTS: can be programmed to follow RTS with a programmable delay, or to be constantly ON. If a channel is disconnected, its CTS line is always OFF, irrespective of the selected mode. DSR: constantly ON, except when the channel is in remote loopback, or under PRBS or BER testing. KHS.1 Functional Description 1-1
Chapter 1 Introduction Installation and Operation Manual DCD: constantly ON, except when communications are not possible because of loss of frame synchronization. End-to-end transmission of local RTS line state to the remote DCD line, and vice versa. Typical end-to-end delay is 2.5msec. The support mode can be independently selected for each channel. The support mode can be independently selected for each channel. The module automatically performs self-test upon power-up and during normal operation. Comprehensive diagnostic capabilities reduce downtime to a minimum. Diagnostics include local and remote channel loops, and in addition the channels support loops 2 and 3 per CCITT Rec. V.54. During maintenance, the activity of the channel transmit and receive lines, and the state of the RTS and DCD control lines can be monitored on the dedicated Kilomux front-panel indicators. Each channel terminates on a separate 25-pin D-type, female connector. Pin-out assignment is in accordance with RS-530 specifications. Local support of four control signals is provided. For connection to V.35, X.21 or RS-422/RS-449 equipment, special cables are available. Figure 1-1 shows typical KHS.1 applications. Figure 1-1. Typical KHS.1 Application 1-2 Functional Description KHS.1
Installation and Operation Manual Chapter 1 Introduction 1.2 Technical Specifications Number of channels Interface type Connectors Two V.35, RS-530, V.36/V.11, RS-449/RS-422 or X.21, DCE Two 25-pin D-type, female Cable interface converters are available for connection to V.35, V.36, X.21 or RS-422/RS-449 physical connectors Pin assignment Bit rate Data Clamp Bandwidth allocation on main link Per EIA RS-530 Selectable 32, 48, 56, 64, 128, 192, 256 or 384 kbps Mark hold on out of sync Permanent, according to programmed channel bit rates Control signals Local support End-to-end Clock options RTS-CTS delay software-controlled, DSR, DCD RTS-DCD: 2.5msec typical delay DCE, DTE1, DTE2 Diagnostic tests Self-test Software-controlled tests Automatic self-test upon power-up and during normal operation Local channel loopback Remote channel loopback PRBS transmission BERT testing (Kilomux-2000/2004 only) CCITT Rec. V.54 pin control Local loopback (V.54 loop 3) Remote loopback (V.54 loop 2) Indicators Configuration Monitoring of the TX, RX, RTS and DCD lines of a selected channel on dedicated Kilomux front panel indicators Programmable via a supervision terminal, or a RADview management system KHS.1 Technical Specifications 1-3
Chapter 1 Introduction Installation and Operation Manual 1-4 Technical Specifications KHS.1
Chapter 2 Installation and Operation 2.1 General This chapter provides installation, configuration and operation instructions for the KHS.1 module. The information presented in this chapter supplements the general Kilomux installation, configuration and operation instructions contained in the Kilomux-2100/2104 Installation and Operation Manual. Caution The KHS.1 module contains 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. Rear Panel 2.2 Installation The rear panel of the KHS.1 module is shown in Figure 2-1. The module has two 25-pin connectors, one for each channel. Connector pin assignments and functions are given in Appendix A. Internal Settings The KHS.1 module has two small plug-in daughter boards called interface changer boards, one for each channel. Their function is to select the channel interface. All the other module functions are programmable. Figure 2-2 identifies the position of the interface changer boards. KHS.1 Installation 2-1
Chapter 2 Installation and Operation Installation and Operation Manual KHS.1 CH.1 Channel 1 Connector CH.2 Channel 2 Connector Figure 2-1. Rear Panel CH.1 V.35 J2B J2A Channel 1 Interface Changer V.35 J2 RS-422 RS-422 J3 J3B J3A CH.2 RS-422 J4B J4A Channel 2 Interface Changer V.35 J4 RS-422 J5 J5B J5A Figure 2-2. Internal Settings 2-2 Installation KHS.1
Installation and Operation Manual Chapter 2 Installation and Operation Channel Interface Selection The selection of the channel interface is made by plugging the corresponding interface changer board into one of the connector pairs J2, J3 or J4, J5, in accordance with the required interface. Table 2-1 lists the required settings. Table 2-1. Selection of Channel Interface Interface Settings Channel Position of Changer Board V.35 1 In connector J2 2 In connector J4 RS-530, X.21, V.36, RS-449, RS-422 1 In connector J3 (default position) 2 In connector J5 (default position) Changer Board Setting Procedure Identify the positions of the changer boards in Figure 2-2. Check the required interface for each channel. If a different interface is required, pull the corresponding changer board out and move it to the appropriate connector. When inserting the changer board, pay attention to correct orientation (do not turn the board around), and proper insertion in the connector. Module Installation Refer to the system installation plan and insert the module in the assigned I/O slot of the Kilomux enclosure. The module starts operating as soon as it is plugged into an operating Kilomux enclosure. Cable Connections Identify the cables intended for connection to the channels of this module, and connect each cable to the appropriate module connector. The required cables can be prepared in accordance with the channel connector wiring information given in Appendix A. However, ready-made cables are also available from RAD Data Communications. The available cables and the use of each cable are listed in Table 2-2. KHS.1 Installation 2-3
Chapter 2 Installation and Operation Installation and Operation Manual Table 2-2. Interface Cables Cable Purpose Channel Interface User Equipment Length CBL-HS2V1 V.35 DCE V.35 DTE 2 meters (6 feet) CBL-HS2V2 V.35 DTE1 V.35 DCE 2 meters (6 feet) CBL-HS2V3 V.35 DTE2 V.35 DCE 2 meters (6 feet) CBL-HS2R1 RS-422 DCE RS-422 DTE 2 meters (6 feet) CBL-HS2R2 RS-422 DTE1 RS-422 DCE 2 meters (6 feet) CBL-HS2R3 RS-422 DTE2 RS-422 DCE 2 meters (6 feet) CBL-530T/21C RS-422 DTE, DCE X.21 DCE, DTE 0.3 meters (1 feet) 2.3 Configuration Introduction This section provides specific instructions for the configuration of the KHS.1 module using a supervision terminal. The instructions appearing in this section assume you are familiar with the operation and capabilities of the supervision terminal. If necessary, refer to Chapter 4 of the Kilomux-2100/2104 Installation and Operation Manual for general operating instructions, and for instructions on the execution of other configuration activities. The configuration functions applicable to the KHS.1 module are listed below: Inclusion of a KHS.1 module not yet installed in the Kilomux database. This allows the pre-programming of the module parameters, so when the module is installed in the enclosure, it will immediately start operating in the desired mode. This function is performed by means of the DEF SYS command. Selection of the main link to be used by the module, and when applicable, module priority. This function is performed using the DEF CON command. This command is available only on the Kilomux-2000/2100, provided it is operating in the dual-link, priority bumping or switched-backup mode (but not in the single link or redundancy modes). Programming of the module channel parameters, using the DEF CH command. Before starting the configuration procedure, obtain the list of prescribed channel parameters from your system administrator. 2-4 Configuration KHS.1
Installation and Operation Manual Chapter 2 Installation and Operation Configuration Instructions If the supervision terminal is not yet connected to the Kilomux, connect the terminal and start a configuration session in accordance with Chapter 4, Section 4-4 of the system manual. Inclusion of KHS.1 Module in Database If the KHS.1 module to be configured is not yet installed in the Kilomux, type: DEF SYS <Enter> The system parameters data form is displayed. A typical form for a Kilomux-2100 is shown below. The form presents the current parameter values as defaults. CLK_MASTER CLK_FBACK DWLD_BW_A DWLD_BW_B ML_MODE ML_RECOVERY FRAME_MODE N/A N/A NO NO SW_BACK AUTO AUTO Assuming that the only necessary changes are the inclusion of a new KHS.1 module in the system database, press >. The second line of the system parameters data form is displayed. A typical data form for a Kilomux-2100 is shown below: IO : 1 2 3 4 5 6 TYPE(DB): KHS.1 --- --- --- --- Note If the desired slot number is not shown, press <Enter> once or twice, until the desired group of slot numbers is displayed. Press the spacebar to move the cursor to the desired slot number, and then press F or B to scroll among the available selections. When the desired selection (KHS.1) is displayed, press the space bar to move to the next field. After the desired selections are made, press > to end. The supervision terminal will display the time and date fields, followed by the Kilomux prompt. Selection of Main Link and Priority (Kilomux-2000/2100 only) Note Skip this section if the main link mode is SINGLE or REDUNDANCY. This section describes the process of selecting main link and priority in the Kilomux-2000 (KCL.1). If you are using the Kilomux-2100 (KCL.2), see Appendix F of the Kilomux-2100/2104 Installation and Operation Manual. To define the main link and/or priority of a selected KHS.1 module, type: DEF CON <Enter> The connections table is displayed. The table lists the I/O slots and the main link currently used by each module, as well as the priority assigned to each module when a flip occurs from main link A to main link B and from main link B to main link A. A typical display is shown below: I/O GROUP OPERATED_HIGHWAY PB[A->B] PB[B->A] SWITCH ============================================================== KHS.1 Configuration 2-5
Chapter 2 Installation and Operation Installation and Operation Manual OP ALL ML-A LOW N/A N/A 1 ALL ML-A HIGH N/A N/A 2 ALL ML-A HIGH N/A N/A 3 ALL ML-A LOW N/A N/A 4 ALL ML-A LOW N/A N/A 5 ALL ML-A LOW N/A N/A 6 ALL ML-A LOW N/A N/A 7 ALL ML-A LOW N/A N/A 8 ALL ML-A LOW N/A N/A 9 ALL ML-A LOW N/A N/A 10 ALL ML-A LOW N/A N/A 11 ALL ML-A LOW N/A N/A 12 ALL ML-A LOW N/A N/A Column PB[A->B]: In use in Priority Bumping and Switched Backup main link modes. High This module will switch to main link B when a main link flip occurs. Low This module will not switch to main link B when a main link flip occurs. Column PB[B->A]: In use in Priority Bumping main link mode. High This module will switch to main link A when a main link flip occurs. Low This module will not switch to main link A when a main link flip occurs. Column SWITCH: In use in Switch, Dual Switch, Single and Switch main link modes when SWITCH_ MODE is configured as AUTO. High Switched main link will establish an ISDN connection on request from this module. Low Switched main link will ignore request from this module for an ISDN connection. If priority bumping and switched backup are disabled, columns PB[A->B] and PB[B->A] show N/A for all the slots. Use the space bar to move the cursor to the number of the slot in which the desired module installed, and press the F or B key to change the main link. Use the space bar and the F and B keys to change the priorities as necessary. If the two main links operate at the same data rate, the Kilomux-2100 automatically sets the same priorities for flips in either direction. Then this line shows N/A for all the slots. If the data rates of the two main links are different and the priority bumping mode is used, you can select the priorities for each I/O slot using the same procedure as above. When done, press <Enter>. After the desired parameter values are selected, press > to end. The supervision terminal will display the time and date fields, followed by the Kilomux-2100 prompt. 2-6 Configuration KHS.1
Installation and Operation Manual Chapter 2 Installation and Operation Channel Configuration To start the configuration of a specific channel of a KHS.1 module, enter the command: DEF CH A:B where A is the number of the module slot (7 to 18 for Kilomux-2000, or 1 to 4 for Kilomux-2004), and B is the desired module channel (1 or 2). The supervision terminal displays the channel configuration data form. A typical data form for a KHS.1 module is shown below: SPEED PROTOCOL ASYNC_DATA TIMING CTRL_SIG CTS RTS_CTS_DEL 9.6KBPS ASYNC 8 BITS DCE LOCAL ON MIN Note For a description of parameters and their allowed range of values, refer to Section 2-3. Change parameters as follows: Bring the cursor to the beginning of the first field to be changed by pressing the spacebar. To change the selected field, press F or B to scroll among the available selections. When the desired selection is displayed, press the spacebar to move to the next field. After the desired parameter values are selected, press <Enter> to end. The supervision terminal will display the time and date fields, followed by the Kilomux prompt. Note To avoid problems of compatibility issues between the Kilomux main link and KHS.1 (see Table 2-4). Table 2-3. Compatibility of Main Link and KHS.1 Data Rates KML Data Rate KHS.1 Data Rate [kbps] [kbps] 32 48 56 64 128 192 256 384 48 + 56 + + 64 + + + 128 + + + + 192 + + + + 256 + + + + + 384 + + + + + + 512 + + + + + 768 + + + + + + + 1024 + + + 1536 + + + + + KHS.1 Configuration 2-7
Chapter 2 Installation and Operation Installation and Operation Manual Channel Parameters Table 2-3 lists the KHS.1 channel parameters that can be configured. Table 2-4. Channel Parameters Designation Function Values SPEED Determines the channel data rate NC: Channel not connected 32 kbps 48 kbps 56 kbps 64 kbps 128 kbps 192 kbps 256 kbps 384 kbps Default: NC Note: Some channel rate and main link rate combinations may not be supported, see Table 2-1. TIMING CTRL_SIG CTS RTS_CTS_DEL Selects the data channel timing mode. Determines the handling of control signals by the data channel being configured. Selects the state of the CTS line in the user data channel. Controls the delay between the RTS and CTS control signals when the CTS=RTS mode is selected. DCE: Kilomux-2000 operates as a DCE and provides transmit and receive clocks to the synchronous user DTE. DTE1: Kilomux-2000 supplies the receive clock to the user equipment and accepts the user transmit clock. DTE2: Kilomux-2000 requires transmit and receive clocks from the user equipment. Default: DCE LOCAL: End-to-end transmission of control signals is disabled. Only local support is enabled RTS: The state of the local RTS line is transmitted to the remote DCD line. Default: LOCAL ON: CTS continuously on =RTS: CTS line follows the RTS line Default: When the channel is connected: ON When the channel is not connected: OFF MIN: Minimal delay (approximately 2.5 msec) 10 msec 50 msec 100 msec 200 msec Default: MIN 2-8 Configuration KHS.1
Installation and Operation Manual Chapter 2 Installation and Operation Considerations in the Selection of the CTS and RTS_CTS_DEL Parameters The selection of the parameters CTS and RTS_CTS_DEL depends on the specific requirements of each application. When analyzing your requirements, take into consideration the following recommendations that can help increase the throughput: When the application requires the transfer of the local RTS to the remote DCD, always select CTS=RTS and select MIN for RTS_CTS_DEL. There is no need to delay the CTS with respect to RTS, because in this case when a data transmission is started (i.e., the RTS line is switched to ON), the remote end will start receiving data only after the remote DCD line is switched to ON. In a multidrop configuration, such as that shown in figure 2-3, when CTS=RTS, it is necessary to select a RTS-CTS delay longer than the RTS-CTS delay of modem A. This is necessary because when the DTE connected to the West Kilomux signals the start of a transmission by setting its RTS line ON, there is a delay before modem A (that receives the RTS signal from the DCD line of the East Kilomux) returns ON on the CTS line. The West KILOMUX must therefore delay the CTS to the DTE by an interval, which is greater than the modem A RTS-CTS delay. If the delay is shorter, modem A will not transmit the beginning of the data transmission. KILOMUX-2000 West KILOMUX-2000 East Modem Modem A KHS.1 KHS.1 DTE Modem Control Signals DTE KHS.1 Channel RTS RTS CTS CTS Control Signals KHS.1 Channel Modem RTS DCD DCD RTS CTS CTS Figure 2-3. Multidrop Configuration Example KHS.1 Configuration 2-9
Chapter 2 Installation and Operation Installation and Operation Manual 2-10 Configuration KHS.1
Chapter 3 Alarms and Diagnostics 3.1 General This chapter provides information on the alarms generated by the KHS.1 module, and instructions for using the module-specific diagnostic functions. The diagnostic information presented in this chapter supplements the general Kilomux diagnostics operation instructions contained in Chapters 3 thru 6 of the Kilomux-2100/2104 Installation and Operation Manual. 3.2 Alarm Messages Table 3-1 lists the alarm messages generated by the KHS.1 module specifies their type (event or state), and explains their interpretation. The alarm messages generated by the KHS.1 module that are displayed by a supervision terminal connected to the Kilomux are listed in Chapter 4 of the Kilomux-2100/2104 Installation and Operation Manual. Table 3-1. KHS.1 Alarm Messages Alarm Message Type Interpretation HARDWARE ERROR State A KHS.1 hardware failure has been detected during the self-test. PHASOR OVERFLOW Event Phasor overflow occurred. This usually happens because of clock rate differences, caused by incorrect selection of system timing modes KHS.1 Alarm Messages 3-1
Chapter 3 Alarms and Diagnostics Installation and Operation Manual 3.3 Diagnostics The available functions are: Activation of a local or remote loop on the desired channel. Indication of the state of the lines that control the activation of CCITT Rec. V.54 loop 2 and loop 3 on the desired channel. Pseudo-random sequence (PRBS) transmission on the desired channel. Bit error rate test (BERT) with automatic remote loopback on the remote Kilomux channel (supported by Kilomux-2000/2004 system only). Monitoring of activity on the channel transmit and receive lines, and monitoring of the channel RTS and DCD lines by means of the Kilomux frontpanel indicators. The following sections describe the available test activities. For front-panel test activation instructions, refer to Chapter 3, Section 3-12 in Part I of this manual. For instructions on the activation of tests using a supervision terminal, refer to Chapter 4 in Part I. Test Types Local Channel Loop When a local loop is activated on a KHS.1 channel, the channel transmit signal is returned to the channel receive path. The transmit signal is still connected to the transmit path and reaches the remote user. While the loop is connected, the local user equipment must receive its own signal. The loop signal path is shown in Figure 3-1. KHS.2 Module User or Test Equipment Channel 1 KHS.1 User or Test Equipment I/O Modules KCL KML KML KCL I/O Modules Local Unit Remote Unit System Management Figure 3.1. Local Channel Loop 3-2 Diagnostics KHS.1
Installation and Operation Manual Chapter 3 Alarms and Diagnostics This loop provides a quick check of the connections to the local user equipment. To execute a local channel loop, type the following text into the supervision terminal: LOOP L XX YY Where: XX is the slot number, and YY is the channel number. Remote Channel Loop The signal path depends on the downloading state: If downloading is enabled and a remote channel loop is activated on a KHS.1 channel of the local Kilomux-2000 unit, the KHS.1 module of the remote Kilomux-2000 unit loops back the channel receive signal toward the local channel. The received signal remains connected as usual to the receive path of that unit. The loop signal path is shown in Figure 3.3A. This loop allows the local user to perform a quick check of the end-to-end transmission on this channel. If downloading is disabled, the remote loop is connected on the local Kilomux unit, i.e., the local KHS.1 module returns the receive signal of the tested channel toward the remote Kilomux. The loop signal path is shown in Figure 3.3 B. This loop allows the remote user to perform a quick check of the end-to-end transmission on this channel. Note Downloading is supported only by the Kilomux-2000/2004 system. To execute a remote channel loop, type the following text into the supervision terminal: LOOP R XX YY Where: XX is the slot number, and YY is the channel number. Note The remote loop does not return the control signals. To receive the control signals, you must also perform the control-signal loop on the far-end Kilomux unit. Control Signal Loop When a control-signal loop is activated on a channel of the KLS.1 module (using the LOOP SIG command), the channel transmit control signals are returned to the channel receive control signals. The transmit control signals are not connected to the transmit path. While the loop is connected, the local user equipment receives its own control-signals. The transmitted data, however is connected to the transmit path and reaches the remote user. The received data path is also unaffected by the loop. The loop path is shown in Figure 3.2. Note The Control Signal loop is supported only by the Kilomux-2100/2104 system. If the Control Signal loop is active, data transfer may be momentarily affected when applying any type of loop command to the adjacent channel. KHS.1 Diagnostics 3-3
Chapter 3 Alarms and Diagnostics Installation and Operation Manual Typical Module User or Test Equipment CHANNEL 1 User or Test Equipment Local KILOMUX-2100 Remote KILOMUX-2100 Figure 3.2: Control Signal Loop To execute a remote channel loop, type the following text into the supervision terminal: LOOP SIG XX YY Where: XX is the slot number, and YY is the channel number. CCITT Rec. V.54 Loops KHS.1 channels support the CCITT Rec. V.54 loops 2 and 3. The state of the corresponding loop activation lines can be displayed to the operator. Loop 3 The channel CCITT Rec. V.54 loop 3 command is sent by the user's DTE, using the dedicated loop 3 activation line in the interface connector of KHS.1 channel. The command activates a local channel loop on the local KHS.1 channel (Figure 3.1). To execute a V.54 loop 3, type the following text into the supervision terminal: LOOP V54.3 ML Loop 2 The channel CCITT Rec. V.54 loop 2 command is sent by the user's DTE, using the dedicated loop 2 activation line in the interface connector of the KHS.1 channel. The response to a CCITT Rec. V.54 loop 2 command depends on the state of the downloading function: If downloading is disabled (or the system in use is Kilomux-2100/2104 and not Kilomux-2000/2004), a CCITT Rec. V.54 loop 2 command has no effect. If downloading is enabled, a CCITT Rec. V.54 loop 2 command results in the activation of a remote channel loop (on the remote Kilomux-2000 channel, as shown in Figure 3.3A). Note Downloading is supported only by the Kilomux-2000/2004 system. 3-4 Diagnostics KHS.1
Installation and Operation Manual Chapter 3 Alarms and Diagnostics To execute a V.54 loop 2, type the following text into the supervision terminal: LOOP V54.2 ML KHS.1 Module Channel 1 User or Test Equipment User or Test Equipment KHS.1 I/O Modules KCL KML KML KCL I/O Modules Local Unit Remote Unit System Management A. Downloading Enabled KHS.1 Module User or Test Equipment Channel 1 KHS.1 User or Test Equipment I/O Modules KCL KML KML KCL I/O Modules Local Unit Remote Unit System Management B. Downloading Disabled Figure 3.3. Remote Channel Loop KHS.1 Diagnostics 3-5
Chapter 3 Alarms and Diagnostics Installation and Operation Manual PRBS Transmission The PRBS transmission function is used to provide a test signal to a selected channel of the KHS.1 module. By activating a local or remote main link loop, or a remote channel loop (or by connecting an external loop) while PRBS transmission is activated, this function can also be used to obtain a qualitative evaluation of data transmission without using external test equipment. Data transmission is checked by applying a 2 9-1 (511) bit pseudo-random sequence generated by an internal test sequence generator to the input of the tested channel transmit path. The transmitted data is returned by means of a loop somewhere along the data path (e.g., by connecting a remote channel loop if downloading is enabled, or a local main link loop) to the receive path of the module. The received signal is routed to a test sequence evaluator. The evaluator compares the received data, bit by bit, to the original data and detects any difference (bit error). The output of the evaluator is sampled during module polling, to check whether errors were detected in the interval between consecutive pollings. The test results are displayed on a supervision terminal, the test results are displayed as a number in the range of 0 (no errors detected during the current measurement interval) thru 65535. The number of errors is accumulated from the activation of the PRBS transmission. During PRBS transmission, the tested channel is disconnected from the user data equipment, and the DSR line is turned off on the local side (the DSR line of the user equipment connected to the remote Kilomux module will not be disconnected). Only one PRBS or BERT test can be activated at any time on each KHS.1 module installed in the Kilomux unit. BERT Testing The BERT test is used to evaluate data transmission through a selected channel of the KHS.1 module without using external test equipment. The BERT test can be activated only when the downloading function is enabled, and the link to the remote Kilomux-2000/2004 operates normally. The BERT test is similar to the PRBS transmission test, except that before the evaluation of the received data starts, a remote channel loop is activated. This should cause the sequence to be transmitted along the full path. The test results are displayed as for PRBS transmission. Note This feature is supported only by Kilomux-2000/2004 systems. As for PRBS transmission, the BERT test can be activated on only one channel of each KHS.1 module installed in the Kilomux-2000/2004 unit, the tested channel is disconnected from the user data equipment, and its DSR line is turned off on the local side. 3-6 Diagnostics KHS.1
Installation and Operation Manual Chapter 3 Alarms and Diagnostics Recommended Test Sequence The loops available on the KHS.1 module provide a rapid and efficient way to identify the general location of a fault at either of the two KHS.1 channels connected in a link, or in the external equipment or connections to channels. If a complaint is received from one of the users connected to a KHS.1 channel, first activate the KHS.1 local test loop at the side where the complaint is received. The local user must receive its own signal. If the signal is not received, the problem is at the local end: Check the connections to the user equipment, or the equipment itself. Replace the local KHS.1 module. If the local user receives its own signal when the local loop is activated, the problem is at the remote end. To check, deactivate the local loop and repeat the procedure on the remote Kilomux. KHS.1 Diagnostics 3-7
Chapter 3 Alarms and Diagnostics Installation and Operation Manual 3-8 Diagnostics KHS.1
Appendix A Connection Data Table A-1. Channel Connector Wiring Pin Designation Direction Function 1 FGND Frame ground 2 TD(A) IN TX data - A wire 3 RD(A) OUT RX data - A wire 4 RTS(A) IN Request to send - A wire 5 CTS(A) OUT Clear to send - A wire 6 DSR(A) OUT Data set ready - A wire 7 SGND Signal ground 8 DCD(A) OUT Carrier detect - A wire 9 RC(B) OUT RX CLK - B wire 10 DCD(B) OUT Carrier detect - B wire 11 ETC(B) IN External TX CLK - B wire 12 TC(B) OUT TX CLK - B wire 13 CTS(B) OUT Clear to send - B wire 14 TD(B) IN TX data - B wire 15 TC(A) OUT TX CLK - A wire 16 RD(B) OUT RX data - B wire 17 RC(A) OUT RX CLK - A wire 18 LLB IN Local loop 19 RTS(B) IN Request to send - B wire 20 ERC(A) IN External RX CLK - A wire 21 RLB IN Remote loop 22 DSR(B) OUT Data set ready - B wire 23 ERC(B) IN External RX CLK - B wire 24 ETC(A) IN External TX CLK - A wire 25 TM OUT Test mode KHS.2 Connection Data A-1
Appendix A Connection Data Installation and Operation Manual Note When using the V.35 interface, the control signals use only the A wire. In the direction field: IN input to KHS.1 OUT output from KHS.1 A-2 Connection Data KHS.2
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