IOR7231SB Intelligent T1 Office Repeater CLEI* Code: T1R6KSKAAA

Transcription

1 Section IOR7231SB201 Equipment Issue Rev. B, June 2008 IOR7231SB Intelligent T1 Office Repeater CLEI* Code: T1R6KSKAAA CONTENTS PAGE # 1. GENERAL APPLICATIONS FUNCTIONAL OPERATION OPTIONS STALLATION REMOTE MATENANCE OPERATION TESTG & TROUBLESHOOTG CUSTOMER & TECHNICAL SERVICES WARRANTY & REPAIRS SPECIFICATIONS GENERAL 1.1 Document Description IOR 7231SB ALM BPV VOLTAGE FAC PWR FAC ESF This document describes the Westell IOR7231SB Intelligent T1 Office Repeater plugin module, shown in Figure 1. NOTE Hereafter, the IOR7231SB will be referred to as the IOR" ARM 1.2 Document Status Whenever this practice is updated, the reason will be stated in this paragraph. Revision B updates the company contact information. Revision A replaced practice number Product Description The IOR is designed to provide T1 High Capacity Digital Service (HCDS) over metallic cable pairs from a Central Office, to provide power to the span line repeaters, the DS1 Interface Connector (NIU) and, when required, the Customer Service Unit (CSU), and to facilitate maintenance testing and fault isolation by providing a maintenance loopback that can be activated toward the or toward the Network Interface (NI). The IOR, when powered from a 48 VDC office battery supply, provides power for 60 ma bidirectional span lines requiring up to 130 volts of span voltage. The IOR regenerates T1 signals received from the span and can be optioned to attenuate the T1 transmission toward the span. The enhanced maintenance capabilities, such as the looping back of T1 transmission signals toward the or toward the NI, benefit carrier maintenance operation by allowing the Local Exchange Carrier (LEC) to rapidly sectionalize span faults. Figure Product Mounting Front View of IOR7231SB The IOR is designed to mount in the Central Office and may be resident in any one of the following AT&T mounting configurations (or their equivalent): 48 VDC bays J98725P, J98725R, J98725S (Bay types), shelves J98725A, J98725B, J98725C, J98725D, and J98725F (arrier Small CrossSection Shelves). The IOR may be used in other 220type bays or shelves providing no more than five IORs are installed per shelf unless the office repeater bay has been upgraded for 48V operation. 1.5 Product Features The Westell IOR offers the following features. Span Powering at 60 ma up to 260 VDC Metallic Loopback toward the Logic Loopback toward the Network Interface (NI) Manuallyactivated loopback capability toward the Facility and Copyright 2008 Westell, Inc. All rights reserved. *CLEI is a trademark of Telcordia Technologies. Westell is a registered trademark of Westell, Inc. 0806I1RB Page 1 of 10

2 Section IOR7231SB Rev. B Transmit path Line BuildOut (XMT O) adjustable for 0 to 27.0 db of loss Receive Automatic Line BuildOut (AO) regenerates signals experiencing from 0 to 35 db of loss Builtin adjustable preequalizer, can be adjusted for up to 655 feet of cable to the or can be disabled Arming code for security 30minute arming and loopback timeout Unique 16bit Repeater Loopback address code Remote repeater identification capability Remote Span Powerdown capability Loopback Indication Signal (LIS) Optional Alarm Indication Signal (AIS) upon lossofsignal from the or Facility Span current and voltage test points Front panel LEDs provide quick visual indication for: Power (PWR) Fuse Alarm (ALM) Loss of signal from ( ) Loss of signal from Facility (FAC ) Bipolar Violations (BPV) Presence of ESF framing (ESF) Arming state (ARM) Loopback state () Lightning and power cross protection 2.3 Westell s IOR facilitates maintenance testing, and fault isolation by providing a maintenance loopback that can be activated toward the or toward the Network Interface. While in loopback, the IOR allows the tester to pinpoint a problem in the span line by looping back test signals and verifying the operation of the IOR, the Intelligent Line Repeaters (ILRs), the Network Interface Unit (NIU) and the cable pairs. See Figure 2b and Figure 2c for typical loopback diagrams. 3. FUNCTIONAL OPERATION Refer to Figure 3, the IOR7231SB Block Diagram, while reading the following functional description. 3.1 Transmit To Span (Side 1) Incoming T1 transmission from the is applied to the Side 1, FROM " port, pins 42 and 43 (T&R). These signals are transformer coupled to the Code Detector and the XMT O circuitry. The Code Detector monitors the incoming signal for maintenance control codes, for a Lossofsignal and for the presence of ESF format transmission. The XMT O switches located on S2 insert the selected amount of artificial line in the Side 1 transmit path. The XMT O can be adjusted for 0, 4.5, 7.5 and 15.0 db of artificial line, additive to 27.0 db. This artificial line has a shaped frequency characteristic consistent with the response of twisted wire pair cable used by the Local Exchange Carrier (LEC). From the XMT O circuit, the signal is transformercoupled through the Lightning and Power Cross Protection circuit to the span line via the Side 1, XMT To " port, pins 34 and 35 (T1 & R1) Lossof Signal Detection The IOR constantly monitors the incoming transmission from the for a Lossof signal (). If a occurs, the front panel red LED lights. The IOR can be switch programmed to transmit an unframed, all ones, Alarm Indication Signal (AIS) toward the facility. When the signal is restored, the LED will extinguish and the AIS generation, if enabled, is terminated. CAUTION STATICSENSITIVE This product contains staticsensitive 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 staticprotective packaging from Westell. Use antistatic mats when working on units. 2. APPLICATIONS 2.1 The primary application for Westell s IOR7231SB, shown in Figure 2, is to provide T1 High Capacity Digital Service (HCDS) over metallic cable pairs from a Central Office. 2.2 The IOR supports 60 ma bidirectional spans and can provide power to the span line repeaters, the DS1 interface connector (NIU) and, when required, the Customer Service Unit (CSU). HCDS T1 Span design, including repeater powering and endsection design, should be done in accordance with standard T1 span design or local company procedures Framing Detector The Side 1 transmission path is equipped with an ESF detector. Whenever ESF format transmission is detected from the, the IOR lights the frontpanel green ESF LED. 3.2 Receive From Span (Side 2) T1 transmission signals appearing on the IOR s RCV From " port, pins 26 and 27 (T & R), pass through the Lightning and Power Cross Protection circuit. These signals are then transformercoupled to an extended range Automatic Line BuildOut and Regenerator circuit. The Automatic Line Build Out and the Regenerator circuit regenerates signals experiencing from 0 to 35 db of loss. The output is applied to the Output Driver and the Code Detector circuit. The code detector circuit monitors the incoming signal for maintenance control codes, for a Lossofsignal, and for bipolar violations. The Output Driver provides a 6 Volt basetopeak (12 V peaktopeak) output signal. From the Output Driver, the signal is then applied via Switch S1 to a PreEqualizer or is routed to the output pins. When the PRE EQ position is selected, the internal equal I1RA

3 Rev. B Section IOR7231SB201 END SERVG OFFICE (CO or CEV) T1 LE CUSTOMER PREMISES EQUIPMENT T1 OFFICE REPEATER IOR T1 LE REPEATER ILR T1 LE REPEATER ILR WESTELL S DS1 TERFACE CONNECTOR (DNI) O NETWORK TERFACE IOR7231SB Figure 2a. Typical Application Using Westell s Intelligent Office Repeater, Westell s Intelligent Line Repeaters (ILRs), and Westell s DNI END SERVG OFFICE (CO) T1 LE CUSTOMER PREMISES EQUIPMENT T1 OFFICE REPEATER IOR T1 LE REPEATER ILR #1 T1 LE REPEATER ILR #2 WESTELL S DS1 TERFACE CONNECTOR (DNI) LIS O LIS NETWORK TERFACE Test Center IOR7231SB While in Metallic Loopback, span current is maintained toward the E Figure 2b. Loopback Application: IOR in a Metallic Loopback State () Toward the Test Center (or CO) END SERVG OFFICE (CO or CEV) T1 LE CUSTOMER PREMISES EQUIPMENT T1 OFFICE REPEATER IOR T1 LE REPEATER ILR #1 T1 LE REPEATER ILR #2 WESTELL S DS1 TERFACE CONNECTOR (DNI) O LIS LIS NETWORK TERFACE IOR7231SB Figure 2c. Loopback Application: IOR in a Customer Premises Logic Loopback State ( ) Toward the Field Test Set Field Test Set LEGEND = CUSTOMER PREMISES LOGIC LOOPBACK POT ILR = TELLIGENT LE REPEATER (WESTELL) O = LE BUILD = METALLIC LOOPBACK POT (TEST CENTER ACTIVATED) DNI = DIGITAL NETWORK TERFACE (WESTELL) IOR = TELLIGENT OFFICE REPEATER (WESTELL) = ENERATOR = TEST CENTER LOGIC LOOPBACK POT Figure 2. Typical Through and Loopback Applications for the IORs and Intelligent Line Repeaters (ILRs) izer is then set for the appropriate distance of the cable to the. The PRE EQ switch, S8, provides settings for 0 to 220, 220 to 440, or 440 to 655 feet of cable to the. When the S1 12VPP position is selected, the IOR requires an external equalizer. The signal is then transformer coupled to the via the TO " port, pins 49 and 50 (T1 and R1). 3.3 Facility LossOfSignal Detection The IOR constantly monitors the incoming transmission from the Facility for a Lossofsignal (). If a occurs the front panel red FAC LED lights. The IOR can be switch programmed to transmit an unframed all ones, Alarm Indication Signal (AIS) toward the. When the signal is restored the LED will extinguish and the AIS if enabled is terminated. 3.4 Bipolar Violation (BPV) Detector When bipolar violations are detected from the span, not caused from B8ZS transmission, the IOR flashes its BPV (Bipolar Violations) LED. 3.5 Fault Locate Output The IOR provides a fault locate output for use with an external fault locate system. The IOR does not require termination of the fault locate pair if external fault locate filters are not deployed. 3.6 Span Powering Westell s IOR is equipped with an Automatic Span Power Regulator (ASPR) circuit. The IOR automatically provides the required voltage, up to ±130 Volts DC, to power a 60 ma bidirectional span line from the 48 VDC office battery supply. 0806I1RB 3

4 Section IOR7231SB Rev. B RCV From Span T R Lightning & Power Cross Protection 10 Ohms AO Side 2 Regenerator FAC 12V PP Output Driver S VPP S1 PRE EQ T Fault Locate R To Out T1 R PWR BPV ESF ARM 16bit Code Detector AIS/LIS Generator Microprocessor FAC AIS OFF S10B /130V S3 130V Automatic Span Power Regulator (ASPR) DCDC Converter AIS/LIS Generator ALM Fuse Alarm 48 V Open Loop Detector 10 Ohms 16Bit Code Detector 3V Driver Battery Return Ground T R1 XMT To Span Lightning & Power Cross Protection S2 XMT O Side 1 From In T R Figure 3. IOR Block Diagram Maximum Span Voltage Control (S3) Switch S3 controls the maximum voltage delivered to the span line. When optioned for 130V, the IOR supports spans with up to 2160 Ohms of simplex resistance. When optioned for ±130V, the IOR supports spans with up to 4330 Ohms of simplex resistance. NOTE To minimize the effects of electrolysis, the IOR should be optioned for 130V whenever the maximum simplex resistance is below 2160 Ohms Input Power Indication The IOR is equipped with a green Power (PWR) LED. The PWR LED lights when 48 VDC office battery and battery return ground are present on pins 39 and 17, the internal power supply is functioning properly, and current is flowing through the span. If span current is interrupted the PWR LED pulses at 1 second intervals. When the IOR is placed in the remote Power Down mode, the PWR LED flashes. If the PWR LED is not illuminated the 48 VDC battery supply is absent Input Power Fuse and Alarm LED The IOR has a PCBmounted replaceable ¾Amp fuse, that when open, lights the red ALM (Fuse Alarm) LED and provides 48 VDC to the output of the Power Alarm Lead, pin Span Current and Voltage Pin Jacks The IOR is equipped with four pintype test jacks that are used for monitoring span current and span voltage. Span current is measured as a voltage across precision 10 ohm resistors. The and " jacks are used to measure the simplex current on the RCV FROM simplex lead. The and " jacks are I1RA

5 Rev. B Section IOR7231SB201 used to measure simplex current on the XMT TO simplex lead. The voltage measured across the " or " pin jacks should be between.57 and.63 VDC which equates to a span current of 57 to 63 ma. The span current indicated should be balanced within 2%. Span voltage is measured across the " and " jacks. The span voltage measured should be consistent with the calculated span voltage. SPECIAL ATTENTION The DC to DC converter of the IOR will fold back during open circuit conditions. The open circuit voltage measured across the " and " pin jacks is approximately 95 VDC with option switch S3 in the 130V position and approximately 190 VDC with S3 in the ± 130V position. The voltage measured across the and " and and " jacks will be 0 VDC indicating no span current and an open circuit condition. 4. OPTIONS The IOR contains five option switches located on the side of the unit on the Printed Circuit Board (PCB), two loopback push buttons on the front panel, and several LEDs and pin jacks on the front panel, which are all described and shown in Figure 4. NOTE Set any/all manual option switches prior to installing the unit. 4.1 S1 Switch S1 is a 2position slide switch that provides either 12 volt peaktopeak output to the TO direction/pins when using the external preequalizer, or provides 6 volt peaktopeak output to the TO direction/pins when using the internal preequalizer. 4.2 S2 Transmit Line BuildOut Switch S2 is a 3segment slide switch that inserts the selected amount of artificial line in the Side 1 transmit path. Each switch segment is assigned a value or amount of artificial line, and the values of any switch segments in the position are added for a total cumulative value. The XMT O can be adjusted for 0 db, 4.5 db, 7.5 db, 12 db, 15.0 db, 19.5 db, 22.5 db or 27.0 db of artificial line by placing the proper switches to the position. All segments in the OFF position equals 0 db of artificial line. 4.3 S3 Span Line Voltage Slide Switch S3 controls the maximum voltage delivered to the span line. When optioned for 130V, the IOR supports spans with up to 2160 Ohms of simplex resistance. When optioned for ±130V, the IOR supports spans with up to 4330 Ohms of simplex resistance. 4.4 S8 PreEqualization Switch S8 is a 3position slide switch that adjusts the output TO signal equalizer for either 0 to 220 feet, 220 to 440 feet, or 440 to 655 feet of cable. When using this switch, S1 must be in the PRE EQ position. 4.5 S10B AIS Slide switch S10B enables or disables the transmission of AIS upon, depending upon the switch setting. 4.6 Front Panel Push Buttons: & FAC The FAC front panel push button manually activates and deactivates loopback toward the Facility. The front panel push button manually activates and deactivates loopback toward the. Press either button once to activate loopback in the direction indicated by the push button label, and press the same push button again to deactivate. Pressing the push button for greater than 5 seconds resets the IOR to the factory default settings. 4.7 Front Panel Pin Jacks See Paragraph and Figure 4 for the location of and a description of these pin jacks. 4.8 Front Panel LEDs See Figure 4 for the location of and a description of these LEDs. 5. STALLATION The IOR should be installed according to local company practices; however, if none exist, the unit may be installed as described herein. Installation consists of the following steps. 1. Follow ElectroStatic Discharge (ESD) Precautions. Use and observe ESD precautions and procedures whenever handling the staticsensitive IOR. 2. Unpack and Inspect. If not previously inspected at the of delivery, visually inspect the unit for damages prior to installation. If the equipment has been damaged in transit, immediately report the extent of the damage to the transportation company and to Westell. 3. Set Options. Set all hard switch options prior to inserting the IOR in the mounting shelf/assembly. Option the IOR per local company practice and application or see Figure 4 for option descriptions (for manual, hard" settings). 4. Mount Unit. After setting all the switches to the correct/applicable positions, insert the IOR into its proper slot in the shelf, bay, or mounting assembly. The IOR is designed to mount in the Central Office and may be resident in any one of the following AT&T mounting configurations (or equivalent): 48 VDC bays J98725P, J98725R, J98725S (bay types), shelves J98725A, J98725B, J98725C, J98725D, and J98725F (T Carrier Small CrossSection Shelves). The IOR may be used in other 220type bays or shelves providing no more than five IORs are installed per shelf unless the Office Repeater Bay has been upgraded for 48V operation. 0806I1RB 5

6 Section IOR7231SB Rev. B CAUTION Use care when installing and removing modules do not force into place. If a module resists insertion, remove it and check for debris in or near the connectors and mounting slot, then gently reinsert the module. 5. Perform Installer Connections. No installer connections are required for the IOR other than inserting the module into the cardedge connector in the shelf or assembly. IOR pinouts are shown in Table Verify Power. Verify the presence of power. The front panel PWR LED should be illuminated (see Paragraph 3.6.2). 7. Perform Testing. As a test, perform the remote programming and maintenance commands shown in Table 3. If testing is not done immediately upon installation, the span can be turned over to the test person at the test center or at the E for testing, after inserting each IOR into position and verifying the LED status. 8. Repeat steps 1 7 for each IOR installed. LEAD DESIGNATION P T From In Side 1 Input 42 R From In 43 T1 XMT to Span Side 1 Output 34 R1 XMT to Span 35 T RCV from Span Side 2 Input 26 R RCV from Span 27 T1 To Out Side 2 Output 49 R1 From In VDC Office Battery Power 39 Battery Return Ground 17 Fuse Alarm 32 Note 1: Ground lead can be wired to pins 15, 16, 17, 18, 19, or 44. Note 2: Provides a BATT output on pin 32 if the PCBmounted fuse opens. Table 1. Lead Designations and Pin Assignments 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. 6. REMOTE MATENANCE OPERATION Refer to Table 3, the Intelligent Office Repeater Loopback Activation and Maintenance Control Codes, and the following paragraphs for a description of the remote maintenance capabilities of the IOR. NOTE All codes are transmitted leftmostbit first, except the ESF Data Link codes, which are transmitted rightmostbit first. 6.1 Arming The Span Line The tester must first arm the repeaters before an IOR can be remotely accessed for maintenance testing Arming From the Inband code = > 5 sec. ESF DL code = > 16 ms The IOR is armed from the by sending the Inband Arming code (framed or unframed) for greater than five seconds or the 16bit ESF Data Link Arming code for greater than four repetitions Arming From The Network Interface (NI) ARM code = > 5 seconds The IOR is armed from the NI by sending the Inband Arming code (framed or unframed) for greater than five seconds. Upon receiving the Arming code, the frontpanel ARM LED, of the IOR lights. The IOR remains armed for two hours unless the All Loopdown and Disarm code is received. The IOR allows the Arming code to be sent through the unit towards the Farend NIU. Blocking of the Arming code can be enabled Arming Code Blocking Toggle Activate from: NI Span Line Armed Activate code: > 5 sec. Once the IOR has been armed, sending the Arming Code Blocking Toggle code (C56A hex) from the NI enables or disables the blocking of the arming code. The IOR is shipped with the Arming Code Blocking function disabled. When the function is enabled and the IOR receives Arming code for three seconds from the Network Interface side, the IOR sends an unframed, all ones Alarm Indication Signal (AIS) to the to block the Arming code from disrupting other network elements in the path. 6.2 Loopback The IOR provides a Metallic Loopback toward the and a Logic Loopback toward the NI Metallic Loopback Metallic Loopback () is activated from a test location on the side of the IOR. The Metallic Loopback point is on the spanside of the IOR. Metallic Loopback allows all components, including the Span side transformers and lightning and surge protection circuitry, to be tested. See Figure 2b Logic Loopback Logic Loopback () is activated by a field technician typically from the DS1 Interface Connector (Network Interface) location. Logic Loopback is an electronic loopback. The Logic Loopback point is located before the line drivers and lightning protection circuitry. See Figure 2c I1RA

7 Rev. B Section IOR7231SB Loopback Activation Activate from: or NI Span Line Armed Activate code: > 10 sec. Once the IOR has been armed it will respond to the 16bit IOR Loopback Activate code, received for greater than 10 seconds. When the IOR loopback is activated from the side, the frontpanel yellow (loopback) LED will light steady. When the IOR loopback is activated from the NI, the yellow LED will flash. The IOR loopback timeout period is 30 minutes Loopback Acknowledgment Biterror response: = 231 After receiving IOR Loopback Activation code for three seconds, the IOR sends the following Loopback Acknowledgment toward the direction loopback is being activated: 2 seconds of all ones", followed by IOR enters loopback and returns the unerrored loopback activate code for 5 seconds (pattern sync should be observed by tester) followed by Loopback Activate code injected with 231 biterrors Manual Loopback The IOR can be manually looped back toward the by momentarily pressing the frontpanel switch. The IOR can be manually looped back toward the NI by monetarily pressing the frontpanel FAC switch. Manual Loopback is deactivated by momentarily reactivating the or FAC switch or by sending the appropriate loopback deactivate code. Manual Loopback does not time out Loopback Indication Signal (LIS) When loopback is activated from the, the IOR sends an unframed, all ones Loopback Indication Signal (LIS) toward the span. When loopback is activated from the Network Interface, the IOR sends LIS toward the Power Down Activate from: or NI Activation code: > 5 sec. An armed IOR can be remotely commanded, from the, to temporarily disable span line power. To disable the span power, transmit the Power Down code for greater than five seconds. After receiving the code for five seconds, the IOR enters loopback, removes power from the span line, and returns a loopback acknowledgment of BER = 231. When powereddown, the frontpanel PWR LED flashes. Power to the span line remains off until the Power Down code is removed. After the code is removed, the IOR remains in the Power Down mode for an additional five seconds. After 5seconds, power is restored to the span line and all equipment returns to idle Loopback Deactivate Activate from: or NI, Loopback Activated Activation code: > 5 sec. Loopback can be deactivated before the 30minute time frame by sending the 16bit Loopback Deactivate (ILR LPDN) code (9393 hex) for greater than 5 seconds. The repeater(s), remain armed. Each time the repeater returns to the armed state, the 30minute arming timer resets. The tester can either activate another repeater for testing or can reactivate the same repeater. If further testing is not required, the tester can deactivate and disarm the span line by sending the All Loopdown And Disarm code Loopdown And Disarm from Inband code = > 5 sec. ESF DL code = > 16 ms Sending the Inband All Loopdown And Disarm code for greater than 5 seconds or the 16bit ESF Data Link All Loopdown And Disarm code for greater than 4 repetitions from the deactivates all loopbacks, including the NIU, disarms the span line, and returns the circuit to normal Loopdown and Disarm from the NI Inband code = > 5 sec. Sending the Inband All Loopdown And Disarm code for greater than 5 seconds from the NI deactivates the repeater loopback, disarms the span line, and returns circuit to normal. 6.3 Span Line Status Queries Loopback Query Activate from: or NI Activate code: > 20 sec. The span line can be queried from the or NI to determine which repeater, if any, is in loopback. The side requesting the query sends the Loopback Query code for greater than five seconds. Upon detecting this code, one of the following responses will be returned: no pattern sync indicates none of the equipment is in loopback continuous pattern sync with no errors indicates the NIU is in loopback or there is a preexisting loopback 5 seconds of pattern sync followed by bit errors equal to 231 indicates the IOR is in loopback 5 seconds of pattern sync followed by 250 bit errors indicates an IHR is in loopback 5 seconds of pattern sync followed by 10, 20, 30, bit errors indicates the address of the line repeater in Logic Loopback. (10 errors = ILR #1, 20 errors = ILR # errors = ILR # 20) 5 seconds of pattern sync followed by 15, 25, 35, bit errors indicates the address of the line repeater in Metallic Loopback. (15 errors = ILR #1, 25 errors = ILR # errors = ILR # 20) Power Loop Query Activate from: or NI Activate code: > 5 sec. 0806I1RB 7

8 Section IOR7231SB Rev. B The tester can query an armed span line, from the side, to determine if an open power loop exists. An intelligent repeater in the Open Power Loop mode will enter loopback and return its Loopback Acknowledgment after receiving the Inband Power Loop Query Code for greater than five seconds. The Loopback Acknowledgment (bit errors) identifies the location of the cable cut within the span line. If the cable cut is located between the IOR and the first line repeater, the IOR pulses the PWR LED at 1 second intervals. After receiving the Power Loop Query Code, the IOR enters loopback, returns 231 bit errors, and lights the LED. Loopback will timeout in 30 minutes Issue Query Activate from: or NI Loopback Activated Activation code: > 10 sec. Biterror response: 210 Issue Query allows the tester to determine the Issue number of the IOR in loopback. The side requesting the query sends the 16bit Issue Query code for greater than 10 seconds. The IOR in loopback responds by injecting 210 bit errors into the looped T1 bit stream identifying the product type (200 = IOR) and Issue (10 = Issue 1). 7. TESTG & TROUBLESHOOTG 7.1 Testing After installation is complete, initial testing consists of performing the commands outlined in Table 3. These procedures are intended only to ascertain proper operation of the unit and, if problems should occur, to isolate those problems to the most probable area. 7.2 Troubleshooting If trouble is encountered, verify all installer connections to the assembly and check that the CO power fuse is not blown. Also verify all module connections and option switch settings, and verify the modules are making a positive connection with the shelf connector. If trouble persists, replace the suspect unit and repeat procedures outlined. These testing and troubleshooting procedures are not designed to effect repairs or modifications. Any tests beyond those outlined herein, or repairs made beyond replacing a faulty unit, are not recommended and may void the warranty. 8. CUSTOMER & TECHNICAL SERVICES 8.1 Customer Service & Technical Assistance If technical or customer assistance is required, contact Westell by calling or using one of the following options: Voice: (800) global_support@westell.com For additional information about Westell, visit the Westell World Wide Web site at Part Numbers This equipment is identified by a model, part, and issue number. Each time a change is made to the product which changes the form, fit, or function of the product, the issue number is advanced by one. Be sure to indicate the issue level as well as the part number when making inquiries about the equipment. 9. WARRANTY & REPAIRS 9.1 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. 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: (630) 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 10.1 Ordering Specifications To order units, call the telephone numbers shown in Paragraph 8.1 and please specify a specific model number shown in Table 2. Model# Part # Description IOR7231SB 7231SB (Issue 1) IOR7231SB Intelligent T1 Office Repeater. CLEI* Code: T1R6KSKAAA. Barcode/ECI: R: K *CLEI is a trademark of Telcordia Technologies. Table 2. Ordering and Option Information 10.2 Electrical and Physical Specifications The electrical specifications are listed below, and the physical specifications are shown in Table 4. Transmission A. Repeater Operation: Passive transmit; Regenerative receive I1RA

9 Rev. B Section IOR7231SB201 To Perform This Enter/Send Hex For This Function/Command This Code Value Long Arm from the (CO) (2in5) > 5 sec FF > 4 reps ESF Data Link Arm from the NI > 5 sec. Arm Code Blocking C56A > 5 sec. Toggle Activate IOR Loopback D3D3 > 10 sec. Loopback Query D5D5 > 20 sec. Issue Query B7 > 5 sec. Results/Action Taken/Notes IOR arms and NIU loopback is activated. When armed, IOR s ARM LED lights. If NIU enters loopback, pattern sync is recognized at T1 test location. Arming timeout = 30 minutes. Nearend IOR arms. When armed, IOR ARM LED lights. Note: After receiving arming code for 3 seconds, the IOR could block the inband code from arming farend repeaters and looping back the NIU. Arming timeout = 30 minutes. While armed from the nearend NI, the blocking of the arming code from reaching the farend can be enabled and disabled by sending this toggle code for greater than 5 seconds. Factory default has the blocking disabled. The IOR maintains the status of the blocking function and follows that selection until it is again changed. Activates IOR loopback. Loopback timeout = 30 minutes. Bit error response = 231. Upon receiving Loopback Query code, first repeater in loopback responds with Loopback Acknowledgment sequence. IOR in loopback transmits a 3digit number (total # of bit errors injected into the looped T1 bit stream) in the format of 2X0, where 2 indicates an IOR unit and X indicates the issue #. Power Loop Query B5B > 10 sec. from Power Down > 5 sec. from First armed ILR or IOR in Power Loop enters loopback, sends Loopback Acknowledgment. Loopback times out in 30 minutes. Upon receiving Power Down code, the Armed IOR powers down the span and flashes the green PWR LED. IOR remains in Power Down mode for 5 seconds after Power Down code is removed. Loopback Deactivate > 5 sec./ repeater Repeaters in loopback loopdown, but do not disarm, after receiving the Repeater Loopdown code. All Loopback Deactivate (3in5) & Disarm > 5 sec. From the : Repeaters and NIU in loopback loopdown and disarm after receiving the Inband or ESF Data Link Loopdown and Disarm code FF > 4 reps ESF Data Link From the NIside: Repeaters in loopback loopdown and disarm after receiving the Inband Loopdown and Disarm code. All codes sent Inband unless otherwise indicated. Bit errors are repeated every 20 sec. until the code is removed. All codes transmitted leftmostbit first, except ESF Data Link codes, which are transmitted rightmostbit first. Table 3. IOR Maintenance and Control Codes B. Line Impedance: 100 Ohms at 772 khz C. Automatic Line BuildOut (capture range): 0 to 35 db of loss D. Transmit Line BuildOut: Adjustable from 0 to 27 db in increments of 0 db, 4.5 db, 7.5 db and 15 db Signal E. Line Rate: Mb/s (±200 b/s) F. Pulse Height: 2.7 V to 3.3 V G. Line Signal Pulse Width: 324 nsec. (±30 nsec.) H. Line Pulse Amplitude: 6 V BasetoPeak (nonpreequalized) I. DC Span Current: 60 ma (±3 ma) J. Span Voltage Range: up to 260 V (balanced) K. Line Current Regulation: ±0.5% at voltages from 42 to 56 VDC (48 VDC, typical input) L. Current Drain: 460 ma at 48 VDC, maximum M. Fuse Protection: ¾Amp field replaceable Feature U.S. Metric Height 6.0 in cm Width 1.4 in. 3.5 cm Depth in. 26 cm Weight (approx.) 13 oz g Operating Temp. 40 to 150 F 40 to 65 C Humidity Table 4. 0 to 90% (no condensation) Physical Specifications 0806I1RB 9

10 Section IOR7231SB Rev. B S2 XMT O /130V Front View IOR 7231SB ALM BPV PWR FAC ESF S3 FS1 130V VOLTAGE S8 PRE EQ S1 12VPP PRE EQ AIS OFF S10B RPTR MODE Side View FAC ARM Switch Option S1 S2 XMT O 3segment switch S3 Feature (Front Panel) LEDs Pin Jacks Span Voltage Pushbuttons Position/ Label 12VPP PRE EQ /130V 130V Label ALM PWR FAC BPV ESF ARM FAC Function/Description Provides 12 volt peaktopeak output TO option when using external preequalizer. Provides 6 volt peaktopeak output TO option when using internal preequalizer. When all segments are in the " position, inserts 27 db (sum of all 3 switch segments) of artificial line into the Side 1 XMT path. Values of 4.5, 7.5, 12.0, 15.0, 19.5, 22.5 can be set by placing the appropriate combination of switch segments to the " position and adding their cumulative values. When all segments are in the " position, inserts 0 db of artificial line into the Side 1 XMT path. In /130V position, options DCDC converter to supply from10 up to 130 VDC of span voltage. Maximum simplex resistance = 4330 Ohms. Switch Option S8 PREEQ In 130V position, options DCDC converter to supply from 10 up to 130 VDC of span voltage. Max. simplex resistance = 2160 Ohms. Function/Description Function/Description ALM (red) LED lights if fuse FS1 (¾ A) opens. PWR (green) LED lights when 48 VDC office battery is present. Pulses at 1second intervals when no span current flowing. Flashes when in Remote Power Down mode. Off when IOR is not powered. (red) LED lights when IOR detects a LossOfSignal () from the. FAC (red) LED lights when IOR detects a from the facility. BPV (red) LED lights when IOR detects BiPolar Violations (BPVs) from the facility/customer. ESF (green) LED lights when Extended Superframe (ESF) framing is detected from the. ARM (yellow) LED lights when IOR is armed. Off when IOR is not armed. (yellow) LED lights when loopback is established toward. Flashes when looped back toward the NI. Push to activate permanent loopback toward the. Push again to deactivate. Push for > 5 seconds to reset to factory default settings. Push to activate permanent loopback toward the Facility. Push again to deactivate. S10B FS1 Position/ Label AIS OFF Adjusts output TO for up to 220 feet of cable. S1 must be in PREEQ position. Adjusts output TO for 220 to 440 feet of cable. S1 must be in PREEQ position. Adjusts output TO for 440 to 655 feet of cable. S1 must be in PREEQ position. In AIS position, transmits AIS upon. In OFF position, disables AIS upon. Replaceable ¾amp fuse. and pin jacks allow span current measuring on the RCV from Span" simplex lead. Voltage across and jacks should indicate 0.57 to 0.63 volts DC (equals 57 to 63 ma). (Also see Paragraph ) and pin jacks allow span current measuring on the XMT to Span" simplex lead. Voltage across and jacks should indicate 0.57 to 0.63 volts DC (equals 57 to 63 ma). (Also see Paragraph ) Figure 4. Switch Options and Front Panel Features I1RA