Section 455-500-202 Equipment Issue 2 00-10149 Rev. C, June 2008 I2 2-Wire Foreign Exchange Station (2FXS) Dial Pulse Originating (DPO) Unit with Gain Transfer (GT) CLEI* Code: F1NUUAAA CONTENTS PAGE # 1. GENERAL.................................... 1 2. APPLICATIONS............................... 2. CIRCUIT/FUNCTIONAL DESCRIPTION........ 2 4. OPTIONS & FEATURES....................... 4 5. INSTALLATION............................... 4. ALIGNMENT................................. 7. ING & TROUBLESHOOTING.............. 8. CUSTOMER & TECHNICAL SERVICES......... 7 9. WARRANTY & REPAIRS....................... 7 10. SPECIFICATIONS............................. 7 2FXS/DPO/GT 2TO/GT-PLAR FXS/DPO/GTI2 25020 TA/TB RA/RB FAIL 1. GENERAL 1 Document Purpose This document describes the Westell Issue 2 2-Wire Foreign Exchange Station (2FXS) Dial Pulse Originating (DPO) Unit with Gain Transfer (GT), shown in Figure 1. See Table 5 for product ordering information. - NOTE - Hereafter, the Westell Issue 2 2-Wire Foreign Exchange Station (2FXS) Dial Pulse Originating (DPO) Unit with Gain Transfer (GT) may be referred to as the." 1.2 Document Status This Revision C document updates Figure 1, Figure 4, and the company contact information. Revision B updated Paragraph 10.2, list item Y. Revision A provided a general format update, updated the company contact information, and replaced practice 057-04101. The previous Revision 1 clarified Switch S8-1 operation. This practice reflects the Issue 2 equipment. Whenever this practice is updated, the reason will be stated in this paragraph. 1. Product Purpose and Description The is a 2 wire Channel Unit with multiple functionality and Gain Transfer. It can be used as an 2FXS/GT, a DPO/GT or a 2TO/GT and can serve 2 wire PLAR applications. This flexible channel unit supports standard 2-wire Ground Start and Loop Start, Dial Pulse Origination, Transmission Only, Private Line Automatic Ring Down (PLAR) applications and has a number of significant enhancements to handle all of today s FXS, DPO and TO needs. This multiple function unit includes superior adaptive hybrid loss balancing to accommodate loaded and noloaded facilities with mixed gauge cables. It s adaptive hybrid Figure 1. Front View of insures that transhybrid loss balancing dynamically adjusts for changes to loop plants; guaranteeing superior performance. The may be used as a direct replacement for AT&T Technologies or other manufacturers FXS, DPO, PLAR or TO units where superior transhybrid loss characteristics or gain transfer are needed. 1.4 Product Mounting The typically mounts in one channel unit position of a mounting assembly (such as the AT&T channel bank assembly). 1.5 Product Features The offers the following features. Meets UL-1459, GR-1089, & TR-4801 Adaptive hybrid eliminates the need to set up to 25 switches for precision balance network adjustment providing superior performance Automatically adjusts transhybrid loss balance for cabling changes Supports ON-HOOK transmission for CLASS services Improved ERL & SRL due to digital adaptive transhybrid loss balancing for mixed facilities 2-wire input impedance of 00 Ω and 900 Ω Copyright 2008 Westell, Inc. All rights reserved. Westell is a registered trademark of Westell, Inc. *CLEI and CLASS are trademarks of Telcordia Technologies, and S is a registered trademark of AT&T. Page 1 of 8
Section 455-500-202 00-10149 Rev. C Transmit & Receive 09D equalizers for slope compensation. Supports V.4 modem transmission Provides test mode to force T1 and Drop signaling for installation verification and trouble shooting. Front panel signaling status LEDs simplify troubleshooting. Provides standard ground start, loop start signaling on 2-wire FX loops. 2-Wire PLAR (Automatic Ring Down) support for interfacing another PLAR Provides D and signaling option for PLAR 2-Wire PLAR/FX mode for interfacing another FX line or trunk Provides Dial Pulse Originating operation. Provides CGA Trunk Processing. Sealing current SUPPLY or OFF option (TO/GT) Operates with channel banks. Front panel Maintenance Access Connector (MAC or jack) provides access to XMT TLP, RCV TLP and RNDIS test points for testing and maintenance purposes. XMT and RCV attenuation selection in 0 db increments, for adjusting each transmission path for proper level coordination. Provides automatic loop current limiting. PBX LS/GS MODEM or S-9 RT Mode 1/III FXS/GT Mode= FXS, LS/GS LS/GS FXS/GT or S-9 RT Mode 1/III DPT/GT Mode= FXS, D/D FXS/GT Mode= FXS, or S-9 RT Mode 1/III 2T0/GT Mode= TO, FXO Figure 2a. 2FXS/GT Application S-9 RT Mode 1 or S-9 COT Mode 1/III Figure 2b. 2FXS/GT Integrated S9 Application Figure 2c. 2FXS/GT to DCS Application or S-9 COT Mode 1/III DPO Mode= DPO, Figure 2d. 2DPO Application or S-9 COT Mode 1/III 2TO/GT Mode= TO, CO SWITCH CO SWITCH DCS CO SWITCH Originating Trunk MODEM 2. APPLICATIONS Figure 2e. 2TO/GT Application 2 The can be used to provide Foreign Exchange Station, Dial Pulse Originate, Private Line Automatic Ringdown, or Transmission Only capability to a channel bank. 2PLAR 2PLAR 2.2 The includes gain transfer characteristics of benefit to long loops. Additional gain and equalization are provided to compensate for longer loop length characteristics. Mode= PLAR/E&M, Mode= PLAR/E&M, Figure 2f. 2PLAR/PLAR Application 2. The includes superior adaptive transhybrid loss balancing to accommodate higher levels in the network. 2.4 Some typical applications include those shown in Figure 2. 2PLAR/ FX 2FXS. CIRCUIT/FUNCTIONAL DESCRIPTION Refer to Figure ( Block Diagram) as needed while reading the following brief description of the s functions. Hybrid VF signals enter and leave the channel unit through the 2-wire port. The hybrid line interface allows dc supervisory current to flow while minimizing its effect on the VF signals. Switch selected taps provide 00 Ω or 900 Ω impedance matching; an echo canceler further improves transhybrid loss balancing for mixed facilities. The hybrid converts the 2-wire input signals to 4-wire Mode= PLAR/FX, 2PLAR/ E&M Mode= PLAR/E&M, D Figure 2. Figure 2g. 2PLAR/FXS Application D 2PLAR (D signaling) Figure 2h. 2PLAR/PLAR Application Applications 2
00-10149 Rev. C Section 455-500-202 RVR 27 RING RELAY +8 0 to 24dB XMT ATTN GAIN* SLOPE EQ 8.5 1 8.5dB TLP 7 +8.5 TPCM 5 TIP 24 5 11 OFF LINE INTERFACE HYBRID Input Impedance 00 Ω 900 Ω CAUTION NOTE: MAC jack levels are valid only at 1000Hz CODEC Echo Canceler 51 RING 20Hz 54 SUPPLY 12 + GAIN* SLOPE EQ 0 to 24dB RCV ATTN +4dB TLP 4 9 +4 RPCM 9 4 PLAR/FXS PLAR/E&M FXS CGA/IDLE DPO TO 2 0 FGND 1 RG TG RING D/D M O D E +12 12 +5 GND X M T R C V RA RB TA TB FAIL 12 1.5.8.4.2 XMT ATTN MICROPROCESSOR Figure. 12 1.5.8.4.2 RCV ATTN Block Diagram SL8 SL4 SL2 SL1 SLOPE * Gain at 1KHz from slope Equalizer: Slope 0 1 2 4 5 7 8 9 10 11 12 1 14 15 Gain 0 0 0. 0. 0.9 1. 1.7 2 2.4 2.8..7 4 4.5 4.9 5. NORM XMT ATTN= 8dB loop loss +gain of slope Equalizer (assumes transmit level at digital interface 0dB) RCV ATTN= db loop loss +gain of slope Equalizer receive level desired at PBX(far end of circuit) (See example of setting XMT and RCV ATTN in Paragraph. REV BATT CHANNEL UNIT LOGIC CONTROL 8 2 4 10 RNDIS TWD TSP TSQ TA TB RSQ RSP RWD RFA RFB TFCC RCLK BTFCC TCLK DGND AGND TPAMGND RPAMGND 14 7 8 4 40 1 9 1 7 12 8 21 11 5 29 42 signals for XMT path use and converts 4-wire RCV signals to balanced 2-wire output signals..2 Transmit Amplifier/Attenuator The 2-wire VF signals pass through the hybrid circuitry and are coupled to the transmit amplifier/attenuator which provides from 0 to 24 db of switch-selected attenuation in 0 db steps. The transmit attenuation allows adjustment of the 2-wire input level of +1.8 dbm to -9 dbm to the -8.5 db required at the transmit TLP (pins 1 and 7 of jack J1). The jack provides access to the output of the transmit attenuator, after the equalizer.. Transmit Equalizer The transmit equalizer provides post-equalization adjustment of the cable connected to the T&R port. Adjustment settings for equalizer performance in accordance with the WORD document. The slope compensation provided is 09D type..4 Receive Amplifier/Attenuator VF signals from the codec are passed through test jacks (pins and 9 of jack J1) to the receive amplifier/attenuator. The receive attenuator provides from 0 to 24 db of switch-selected attenuation in 0 db steps. This allows for adjustment of the 2-wire output to the required level (between -9 dbm and + dbm). The VF output is coupled through the hybrid to the 2-wire port..5 Receive Equalizer The receive equalizer performs the same equalization functions as the transmit equalizer for the receive path.. Signaling Proper signaling is provided for all functions supported..7 Automatic Loop Current Limiter Limits loop current on short loops and keeps ON and OFF HOOK impedance high, yielding excellent THL in both ON and OFF HOOK states.
Section 455-500-202 00-10149 Rev. C TO DPO CGA/IDLE FXS PLAR/E&M PLAR/FX D/D S8 MODE S2.2.4.8 1.5.0.0 12.0 XMT ATTN S7 RG TG RING XMT IN RCV SL1 SL2 SL4 SL8 S4 IN NORM S9 REV BATT OFF.2.4.8 1.5.0.0 12.0 RCV ATTN S5 SUPPLY S 00 S1 2FXS/DPO/GT 2TO/GT-PLAR FXS/DPO/GTI2 TA/TB RA/RB 25020 FAIL 900 Figure 4. Option/Feature Locations.8 Echo Canceler The echo canceler provides superior return loss in the presence of a variety of cable configurations. If modem presence is detected, this adaptive echo canceler is disabled. Note that the echo canceler may take a few seconds to align in the presence of a test signal. 4. OPTIONS & FRONT PANEL FEATURES The contains features and switch options located on the front and side (PCB) panels (as shown in Figure 4) to accommodate the various circuit applications. The following is a brief description of the options available to accommodate the various circuit applications. Also see Paragraph to set slope and attenuation switches. 4 Side Panel (PCB) Features & Options 4 Switch S1-2-Wire Impedance Sets the 2-wire termination to 00 Ω or 900 Ω. 4.2 Switch S2 - XMT ATTN Provides 0 to 24 db of attenuation in 0 db steps. 4. Switch S - RCV ATTN Provides 0 to 24 db of attenuation in 0 db steps. 4.4 Switch S4 - Slope Compensates for the slope characteristics of the cable. 4.5 Switch S5 - Sealing Current Supplies nominal 20 ma sealing current. 4. Switch S7 - Test Mode Sets the units operation in test modes for either transmit or receive. 4.7 Switch S8 - Mode Control Selects the basic function of the unit to FXS, DPO, PLAR/FX, PLAR/E&M, or TO. Also selects CGA/IDLE operation (only active in FXS or DPO mode), and or D/D signaling operation (D only active in PLAR/E&M mode and D signaling only used in FXS mode when integrated to a switch in S9 Mode 1). [Refer to application drawings in Figure 2.] 4.8 Switch S9 - Battery Control Sets battery to NORMal or REVerse when in Receive test mode. 4.2 Front Panel Features 4.2 Test Jack The contains a MAC-type test jack for testing purposes. This jack is labelled, as shown in Figure 4. 4.2.2 Front Panel Status LEDs The LEDs on the front panel provide a visual indication of the conditions. The LEDs are described in Table 1. LED Label LED Color LED Description TA Red Transmit A. LED is on when Transmit A bit is On. TB Red Transmit B. LED is on when Transmit B bit is On. RA Red Receive A. LED is on when Receive A bit is On. RB Red Receive B. LED is on when Receive B bit is On. FAIL Red Fail. LED is on when mode switch settings are invalid. Table 1. Front Panel LED Conditions and States 5. INSTALLATION Installation consists of inspecting the equipment for damages, following proper safety precautions, setting the option switches to their desired position, mounting the module in the proper slot of the mounting assembly, and performing any installer connections. The following paragraphs provide more instructions for performing these procedures. - INSPECTION NOTE - Visually inspect the unit for damages prior to installation. If the unit was damaged in transit, immediately report the damage to the transportation company and to Westell (see Part ). 4
00-10149 Rev. C Section 455-500-202 Option Position Function Switch # Name S1 00 Provides a impedance match for 00Ω + 25 μf termination. Termination 900 Provides a impedance match for 900Ω + 25 μf termination. S2 XMT In Adds from 0 to 24 db attenuation to the XMT path in 0 steps. Attenuation Out S RCV In Adds from 0 to 24 db attenuation to the RCV path in 0 steps. Attenuation Out S4 Slope In Provides slope adjustment. Out S5 Sealing Off Does not supply or terminate sealing current (TO mode). Current Supply Supplies nominal 20 ma sealing current (TO mode). NOTE: In non TO modes, this switch MUST be set to SUPPLY. S7 S7-1 XMT Set for normal operation. Activates transmission test mode. S7-2 When in transmission test mode, forces Loop Closure. When in transmission test mode, forces No Loop Closure. S7- RG When in transmission test mode, forces Ring Ground. When in transmission test mode, forces No Ring Ground. S7-4 RCV Set for normal operation. Activates receive test mode. S7-5 TG When in receive test mode, forces Tip Ground. When in receive test mode, forces No Tip Ground. S7- RING When in receive test mode, forces Ring. When in receive test mode, forces No Ring. S9 RCV SIG XMT BATT NORM Forces normal battery signaling condition. CONTROL XMT BATT REV Forces reverse battery signaling condition. S8 S8-1 D/D D or D signaling (D signaling only active when in PLAR/E&M mode. Use FXS mode and D signaling when in an integrated S9 Mode 1 application). Mode Control signaling all other applications [See application drawings in Figure 2]. S8-2 PLAR/FX Private line Auto Ringdown to Foreign exchange application. S8- PLAR/FX Private Line Auto Ringdown to PLAR application. S8-4 FXS Foreign exchange Station Loop or Ground Start application. S8-5 CGA/IDLE During Carrier Group Alarm (CGA), IDLE is sent continuously. S8- DPO Dial Pulse Originate application. S8-7 TO Transmission Only application. During CGA, send IDLE 1 st 2.5 sec then BUSY (FXS or DPO mode). Table 2. Switch Option Settings 5 Mounting the Module Westell s mounts in one channel unit position of a mounting assembly. After setting the option switches per the desired application (see Parts 2 and 4, Figure 4, and Table 2), align the module with the mounting or assembly card guides above and below the module and insert it as far as it will go into the slot connector. CAUTION - STATIC-SENSITIVE This product contains static-sensitive components! Proper electrostatic discharge procedures must be followed to maintain personal and equipment safety. Do not store units near magnetic, electromagnetic or electrostatic fields. Always store or ship units in the original static-protective packaging from Westell. Use anti-static mats when working on units. 5
Section 455-500-202 00-10149 Rev. C - CAUTION - Use care when installing and removing modules - do not force a module into place. If a module resists insertion, remove it to check for obstructions by the connectors and mounting slots, then carefully re-align and gently re-insert module. - PRECAUTIONARY STATEMENT - Never install telephone wiring during a lightning storm. Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations. Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface. Use caution when installing or modifying telephone lines. This equipment is intended to be used behind devices that provide primary lightning protection. This equipment is to be installed in a restricted access location. 5.2 Making Installer Connections Installer connections for the drop-side ports of the and the RT loop are made via the connectorized cables of the AT&T channel bank assembly. The RT loop connections to the connectorized cables are made at the Main Distribution Frame using the appropriate T&R cable pairs for the mounting position of the. All other connections required by Westell s, including power, are integral to the channel bank assembly. Pin-outs for the are shown in Table. Lead Designation Pin # T - Tip 24 R - Ring 51 TA TB 4 RFA 10 RFB SIGNAL LEADS 7 RCLK 8 BTFCC 21 TCLK 11 TPCM 5 RPCM 9 RNDIS 14 TFCC 12 TWD TSP 7 ADDRESS LEADS TSQ 8 RWD 9 RSP 1 RSQ 40 +12V 4-12V 2 +5V 0 DGND 5 POWER AGND FGND 1 T PAM GND 29 R PAM GND 42 Table. Pin/Lead Designations. ALIGNMENT Set levels and slope adjustments according to WORD document for GT type units. Alternately, the procedure for setting slope may be found in AT&T publication 855-51-105 and transmit and receive levels by the following formulas: XMT ATTN = 8dB - loop loss + Gain of Slope Equalizer (assumes 0 db desired at digital interface) RCV ATTN = db - loop loss + Gain of Slope Equalizer - RCV level desired at PBX Gain from Slope Equalizer Slope setting Gain (db) Slope setting Gain (db) Example: 0 0 8 2.4 1 9 2.8 2. 10.. 11.7 4.9 12 4 5 1. 1 4.5 1.7 14 4.9 7 2 15 5. Loop loss is 7 db; slope setting is yielding 0. db gain; 0 db is desired into digital interface and -4 dbm is desired level at PBX Then set XMT ATTN to 1. db = 8-7 + 0. and set RCV ATTN to. db = - 7 + 0. -(-4).2 For applications where non-gt units are being replaced by this unit increase the transmit attenuation by.5 db, and increase the receive attenuation by db. In addition slope settings should be set to 0. 7. ING & TROUBLESHOOTING 7 Testing 7 The may be used on a Sierra 41 channel unit extender (CUE) with the DATA PORT switch in the DATA PORT position. The signaling test functions of the Sierra extender will not function properly. This occurs because the uses an onboard CODEC and signaling functions take place on the PCM highway rather than the signaling highways on the backplane. 7.2 The has signaling test functions built in. Special test switches are mounted on the surface of the board requiring the to be placed on a standard CUE, such as a AT&T model J9872 ME, MF or MP CUE or equivalent, for access. See Table 4 and Figure 4 for the functions of the switches. 7. This equipment should not be field repaired. If the equipment is suspected of being faulty, replace it with another unit, optioned identically, and retest. If the replaced unit appears to operate correctly, the original unit may be faulty and should be returned to Westell for repair or replacement (Paragraph 9.2). 7.2 Troubleshooting If trouble is found, verify all installer connections and option settings, verify the modules are making a positive connection with the shelf connector. If trouble persists, replace the suspect unit and repeat procedures outlined. These procedures are not designed to effect repairs or modifications, and are intended only to ascertain proper operation of the unit and, if problems should occur, to isolate the problems to the most probable area. Tests beyond those outlined herein, or repairs made beyond replacing a faulty unit, are not recommended and may void the warranty.
00-10149 Rev. C Section 455-500-202 Mode XMT Switch XMT AB BITS RCV Switch Output to T&R Equivalent RCV AB DPO NOT 00 NORM NORM. BATT 0X 11 REV REV BATT. 1X Note: RG Switch ignored in DPO Note: TG and Ring ignored in DPO X: Don t care FXS NOT TG NOT RG NOT 01 RING NOT NO TG 1 X S9 NORM TG RG NOT 11 RING NOT NORM BATT 0 1 S9 NORM NOT TG RG 00 RING NOT REV BATT 0 1/0 S9 REV TG OR TG NOT RG 01 RING RINGING 0 0 S9 NORM OR REV Note: 1/0 Toggle PLAR E&M NOT D D RG NOT 00 11 RING NOT NORM BATT 00 11 11 00 RG NOT RING RINGING 11 00 Note: RG & S9 Switches ignored in any PLAR mode. will do 2 seconds ringing and 4 seconds off until ring trip when RCV RING switch S7- is set. PLAR/FX NOT RG NOT 01 (Idle for FX) RING NOT NORM BATT 01 RG NOT 00 (Ringing for FX) RING RINGING 11 Table 4. Test Switch Function by Mode 8. CUSTOMER & TECHNICAL SERVICES If technical or customer assistance is required, contact Westell by calling or using one of the following options: Voice: (800) 77-87 email: global_support@westell.com For additional information about Westell, visit the Westell World Wide Web site at http://www.westell.com. 9. WARRANTY & REPAIRS 9 Warranty Westell warrants this product to be free of defects at the time of shipment. Westell also warrants this product to be fully functional for the time period specified by the terms and conditions governing the sale of the product. If an out-of-service situation exists, a replacement unit can be obtained; however, a purchase order number will be required to ensure return of the replacement unit. Any attempt to repair or modify the equipment by anyone other than an authorized Westell representative will void the warranty. 9.2 Repair and Return Westell will repair or replace any defective Westell equipment without cost during the warranty period if the unit is defective for any reason other than abuse, improper use, or improper installation. To return defective equipment, first request a Return Material Authorization (RMA) number from Westell by calling or using one of the options shown below. Once an RMA number is obtained, return the defective unit (freight prepaid), along with a brief problem description, to the address we will provide to you when you contact us. Voice: (0) 75-4211 email: rgmdept@westell.com Replacements will be shipped in the fastest manner consistent with the urgency of the situation. Westell will continue to repair or replace faulty equipment beyond the warranty period for a nominal charge. Contact Westell for details. 10. SPECIFICATIONS 10 Ordering Specifications To order units, call the telephone number shown in Part 8 and please specify a specific model number shown in Table 5. Model # Part # Description I2, 2FXX/DPO/GT Channel Unit. CLEI* Code: F1NUUAAA. Barcode/ECI: 25020. *CLEI is a trademark of Telcordia Technologies. Table 5. Ordering Information 7
Section 455-500-202 00-10149 Rev. C 10.2 Electrical and Physical Specifications The electrical and signalling specifications are listed below, and the physical specifications are shown in Table. A. Network Interface: 4 Kb/s DS0, mechanics. B. CODEC: Standard 8 bit μ-law robbed-bit signaling for. C. Nominal Levels, Including Slope Compensation (TLP): XMT Input: +7.5 dbm to -9 dbm (Limited in practice from 0 to -9 db TLP). RCV Output: + dbm to -10.5 dbm (limited in practice from + to -9 db TLP). D. Nominal Levels, Not Including Slope Compensation (TLP): XMT Input: +1.8 dbm to -8 dbm. RCV Output: + dbm to -9 dbm. E. Attenuation (Switch Selectable): XMT and RCV; 0 to 24 db in 0 db steps. F. Test Level Point (TLP): XMT -8.5. RCV +4.0. G. 2-Wire Impedance (Switch Selected): 00Ω + 25 μf. 900Ω + 25 μf. H. 2-Wire Return Loss: ERL: >28 db. SRL HI/LO: >20 db. I. Transhybrid Loss (typical, including loop): ERL >25 db; SRL >20 db. J. Longitudinal Balance: 200-1000 Hz: >58 db. 000 Hz: >5 db K. Slope Equalization: 09D Transmit & Receive equalizers with equalization in 1 steps. See Block Diagram. L. Idle Channel Noise: XMT and RCV <20 dbrnco. WORKING LOOP RANGES M. Loop Resistance Range: 0 to 2000Ω. 20 Hz. ringing range - 2000 ohms (including loop and subscriber end). Ringing Trip range - 2000 ohms ranges (including loop and subscriber end). Supervision (dialing range) - 2000 ohms ranges (including loop and subscriber end). N. Loop Current: 20 ma or more for 48 volt battery and 2000 ohms, 18 ma or more for 42.5 volt battery and 2000 ohms. Off-hook detection threshold: 1 ma. Ground Start signaling: 1500 ohms maximum (Ring lead is connected through 1500 ohms to -5 volts or less). O. Effective Source Resistance: (2 ga. cable & -48 Vdc) Cable Length R source Cable Length R source 0 Kft 141 ohms 15 Kft 42 ohms Kft 189 ohms 18 Kft 489 ohms Kft 118 ohms 21 Kft 514 ohms 9 Kft 888 ohms 24 Kft 540 ohms 12 Kft ohms P. Filtered Battery Voltage: -42.5 to -5 volts Normal and Reverse battery. Q. Sealing current source: Supply 20 ma loop current or signaling current off. R. On-hook transmission level: 4.5 db lower than off-hook transmission level. S. Immunity to AC Induction: > 28 ma rms., 0 hz, AC induction in the Tip and Ring lead. T. Distinctive Ringing Distortion: < 18 msec. U. Forward Disconnect (FXS mode function): FXS shall open the Tip lead for more than 800 msec when the RCV signaling has open switch interval for more than 400 msec. TRUNK CONDITIONING DURING CARRIER GROUP ALARM: XMT and RCV transmission disabled V. FXS: Open Tip Ground Relay and Ringing Relay for 2.5 seconds then forces the Tip Ground Relay on until CGA is cleared, if CGA/IDLE is NOT selected. W. DPO: On-hook signaling for 2.5 seconds, then off-hook (reverse battery) until CGA cleared, if CGA/IDLE is NOT selected. X. PLAR: Open Tip Ground and Ringing Relay. MODE: Y. FXS: Force Ring Ground, Loop Closure signaling toward T1. Force Tip Ground, Ringing toward drop. Note: The power efficient battery feed circuit used on this unit may make it difficult to detect Tip grounds with some Volt-Ohm meters that use a low internal source voltage. Z. DPO: Force loop closure toward T1. Force Normal/Reverse battery toward drop. AA. PLAR: Force loop closure toward T1. Force ringing toward drop. SWITCHES: AB. XMT Mode: Normal/Test; (when in Test, the following switches are active - Ring Ground/No ring Ground; Loop Closure/No ). AC. RCV Mode: Normal/Test; (when in Test, the following switches are active - Tip Ground/No Tip Ground; Battery - Normal/Reverse; Ringing/ No Ringing). AD. Function Mode Switches: FXS, DPO, PLAR/E&M, PLAR/ FX, TO. AE. LED indications: Transmit A & B bits; Receive A & B bits; Fail. AF. Power: +12, -12, +5 VDC supplies. AG. Power Consumption: 1.2 W, nominal total. 50mW nominal +5V 200mW nominal -12V 240mW nominal +12V 48mW nominal -48V AH. Complies with following technical references: UL1459 AT&T PUB 4801 Telcordia GR-1089-CORE Physical Feature U.S. Metric Height 4.44 in. 11.28 cm Width 1.7 in..48 cm Depth (w/o handle) 9.9 in. 25 cm Weight (approx.) 14 oz. 97 g Operating Temp. 2 to 122 F 0 to 50 C Humidity Table. 0 to 95% (non-condensing) Physical Specifications 8