Routine Maintenance Procedures

NT7E65DJ 323-1111-546 SONET Transmission Products S/DMS TransportNode OC-3/OC-12 NE TBM Routine Maintenance Procedures Standard Rel 14 February 2001 What s inside... Routine maintenance Routine maintenance on the OPC

Copyright 1992 2001 Nortel Networks, All Rights Reserved The information contained herein is the property of Nortel Networks and is strictly confidential. Except as expressly authorized in writing by Nortel Networks, the holder shall keep all information contained herein confidential, shall disclose it only to its employees with a need to know, and shall protect it, in whole or in part, from disclosure and dissemination to third parties with the same degree of care it uses to protect its own confidential information, but with no less than reasonable care. Except as expressly authorized in writing by Nortel Networks, the holder is granted no rights to use the information contained herein. Nortel Networks and S/DMS TransportNode are trademarks of Nortel Networks. VT100 is a trademark of Digital Equipment Corporation. UNIX is a trademark of X/Open Company Ltd. Printed in Canada

Contents iii About this document v Routine maintenance 1-1 Chapter task list 1-1 Routine maintenance frequency 1-1 List of procedures 1-1 Changing air filter elements in air filter units NT4K15AA and NT4K15CA 1-2 1-2 Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA) 1-4 1-3 Cleaning the cooling unit grille 1-6 1-4 Changing the lamp bulbs on the NT7E56AA/AB/BA breaker interface panel 1-8 Routine maintenance on the OPC 2-1 Chapter task list 2-1 Routine maintenance intervals 2-1 List of procedures 2-1 Maintaining the OPC 2-2 2-2 Cleaning the OPC internal digital data storage (DDS) tape drive heads 2-5 Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

iv Contents S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

About this document v This document provides maintenance routines that should be performed every 6 months, or as needed, on OC3/OC-12 network elements. Audience This document is for the following members of the operating company: network administrators field maintenance engineers system lineup and testing (SLAT) engineers and technicians Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

vi About this document S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

1-1 Routine maintenance 1- The S/DMS TransportNode OC-3/OC-12 network element (NE) Transport Bandwidth Manager (TBM) requires little maintenance. Routine maintenance actions follow. Chapter task list The following table includes tasks in this chapter. Task Changing air filter elements in air filter units NT4K15AA and NT4K15CA Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA) Page 1-2 1-4 Cleaning the cooling unit grille 1-6 Changing the lamp bulbs on the NT7E56AA/AB/BA breaker interface panel 1-8 Routine maintenance frequency The following table includes tasks in this chapter and the frequency with which to perform them. Task Changing air filter elements in air filter units NT4K15AA and NT4K15CA Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA) Cleaning the cooling unit grille Changing the lamp bulbs on the NT7E56AA/AB/BA breaker interface panel Frequency Every 6 months, or as required As required As required As required Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

1-2 Routine maintenance Procedure 1-1 Changing air filter elements in air filter units NT4K15AA and NT4K15CA Use this procedure to change air filter elements in air filter units NT4K15AA and NT4K15CA every 6 months, or sooner if required. Air filter unit NT4K15AA is located above cooling unit NT4K18AA (below the upper shelf). Air filter unit NT4K15CA is located under the bottom-most shelf in the bay. The frequency of replacement depends on environmental conditions in the equipment location. Customers determine the frequency. Note 1: The recommended period of 6 months is based on atmospheric conditions that meet the Network Equipment Building System (NEBS) specifications, as outlined in NEBS, section 4.6, Airborne Contaminants. Note 2: To change the air filter element in the TBM shelf and cooling COP kit (NT7E51AA), see Procedure 1-2, Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA). Note 3: Through-flow cooling units (NT4K18BA) and COP cooling units (NT7E7801) for the enhanced TBM shelf (NT4K19AC) have no air filters. Step 1 Disengage the air filter unit from its locking mechanism by quickly pushing and releasing the front face of the air filter unit. 2 Remove the air filter unit by pulling it outwards (see the following figure). FW-3357 Filter retaining lid Air flow FW-3357 Air filter element Air filter unit Cooling unit continued S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Procedure 1-1 (continued) Changing air filter elements in air filter units NT4K15AA and NT4K15CA Routine maintenance 1-3 Step 3 Lift the filter retaining lid, remove the old air filter element, and replace it with a new NPS50004-08 nonwoven synthetic air filter element. Note: Make sure the new air filter element is positioned correctly for the air flow (according to manufacturer instructions for the air filter). 4 Close the filter retaining lid, and reinsert the air filter unit into the shelf until it locks into place. end Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

1-4 Routine maintenance Procedure 1-2 Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA) Use this procedure to change the air filter element NPS50004-06 every 6 months, or sooner if required. The air filter unit NT7E5090 for the TBM shelf and cooling COP kit (NT7E51AA) is located below the TBM shelf. The frequency of replacement depends on environmental conditions in the equipment location. Customers determine the frequency. Note: The recommended period of 6 months is based on atmospheric conditions that meet the Network Equipment Building System (NEBS) specifications, as outlined in NEBS, section 4.6, Airborne Contaminants. Step 1 Remove the front cover of the TBM shelf to expose the latch of the air filter. For instructions on how to remove the shelf cover, see Common Procedures, 323-1111-846. 2 Rotate the latch and pull out the air filter unit using the latch. 3 Remove the filter retaining lid (see Figure 1-1). 4 Remove the old air filter element, and replace it with a new NPS50004-06 nonwoven synthetic air filter element. Note: Make sure you position the new air filter element correctly for the air flow (according to manufacturer instructions). 5 Close the filter retaining lid, and reinsert the air filter unit into the shelf until it snaps into place. 6 Reinstall the front cover of the TBM shelf. end S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Routine maintenance 1-5 Figure 1-1 Changing the air filter element in the TBM shelf and cooling COP kit (NT7E51AA) FW-4120 (TBM,113) 1 Place your fingers in the holes in the filter retaining lid and pull the lid to the back Air filter unit frame Air filter retaining lid 2 When the opposite side of the retaining lid clears the frame of the unit, lift the lid up and out of the frame Air filter unit frame Air filter element Air filter retaining lid 3 Remove the retaining lid and old air filter element (NPS50004-06). Air filter retaining lid Air filter unit frame Air filter element Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

1-6 Routine maintenance Procedure 1-3 Cleaning the cooling unit grille Use this procedure to remove the buildup of dust that accumulates on the grille at the back of the cooling unit NT4K18AA or through-flow cooling unit NT4K18BA. This buildup occurs infrequently because the grille has sufficiently wide holes so that dust does not get trapped. Step 1 Unlock the fan module handle by rotating the screw head until the raised dots no longer align (see Figure 1-2). 2 DANGER Risk of personal injury Keep your fingers away from the fan blades. The blades continue to rotate after the fan module disengages, and can cause injury. Grasp the handle on the front of the fan module and pull straight it out until the module disengages from the backplane. 3 Use both hands to carefully pull the fan module all the way out of the cooling unit (see Figure 1-2). 4 Insert the vacuum cleaner nozzle into the fan module slot and vacuum the area inside the slot. 5 Reinsert the fan module into the cooling unit and press firmly to engage the module into the cooling unit backplane. As the module engages in the backplane, the red LED comes on briefly to show connection. 6 Rotate the screw head to lock the fan module into place (see step 1). 7 Repeat steps 1 to 6 for each fan module. CAUTION Risk of equipment damage The fan module is heavy. To avoid dropping the module, support it with one hand while pulling with the other. end S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Routine maintenance 1-7 Figure 1-2 Removing a fan module FW-1879 Fail LED (red) Indicates a fan failure in this module To open Lock position Support with hand while pulling Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

1-8 Routine maintenance Procedure 1-4 Changing the lamp bulbs on the NT7E56AA/AB/BA breaker interface panel Use this procedure to replace lamp bulbs on the breaker interface panel (BIP). When bulbs burn out, a minor alarm lights up on the BIP (unless the BIP minor alarm bulb is burnt out). Note: The NT7E56CA BIP does not use lamp bulbs. If the LED indicators of the NT7E56CA BIP are defective, then replace pack NT7E5662. CAUTION Damage to lamp socket The NT7E56 BIPs have two types of bulbs: 28-V bulbs for the NT7E56AA BIP, and 6-V bulbs for the NT7E56AB and the NT7E56BA BIP. (The 28-V bulbs can be recognized by a dark filament support in the center of the bulb.) Installing a 6-V bulb in a socket intended for a 28-V bulb damages the lamp socket. Replace NT7E56 BIP lamp bulbs with bulbs of the correct voltage rating. Step 1 Remove the snap-on BIP cover by pulling it outwards (see Figure 1-3). 2 Press the green alarm cutoff (ACO) button to perform a lamp test on the BIP lamp: Power (white), Critical (red), Major (red), and Minor (yellow). Any lamp that does not light is defective. The lamp test lasts for several seconds. 3 Remove any burnt out BIP bulbs by pulling the bulb straight out of the socket. Note: The two BIP bulbs for each alarm lamp are wired in series in the NT7E56AA, and in parallel in the NT7E56AB BIP. In the NT7E56AA BIP, only one of the two bulbs may be burnt out, even if neither bulb lights. Replace lamp bulbs in pairs. For example, if one Critical lamp bulb burns out, replace the adjacent lamp as well. 4 Replace the bulb by gently pushing the new bulb straight into the socket. 5 Perform another lamp test, by pressing the ACO pushbutton, to ensure that all replaced bulbs are correctly inserted and operational. 6 Replace the snap-on BIP cover. end S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Routine maintenance 1-9 Figure 1-3 View of the breaker interface panel, NT7E56AA/AB/BA FW-0147 Circuit breaker trip LED (red) To office battery distribution Power terminal blocks Battery filter breaker (not available on NT7E56AA) A- A+ B- B+ Modem (optional) Circuit breakers Configuration DIP switches BIP, maintenance terminal, modem, and lamp circuit breakers ACO/lamp test pushbutton To shelf power terminal blocks Power (white) critical (red) major (red) minor (yellow) Lamps Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

1-10 Routine maintenance S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

2-1 Routine maintenance on the OPC 2- The S/DMS TransportNode OC-3/OC-12 network element (NE) Transport Bandwidth Manager (TBM) requires little maintenance. The only routine maintenance actions that may be required for the operations controller (OPC) are as follows. Chapter task list The following tasks are included in this chapter. Task Page Maintaining the OPC 2-2 Cleaning the OPC internal digital data storage (DDS) tape drive heads 2-5 Routine maintenance intervals The following table indicates the intervals for performing routine maintenance. Task Maintaining the OPC Cleaning the OPC internal digital data storage (DDS) tape drive heads Interval At least every 4 months Every 25 hours of tape use, or as indicated by the slow-flashing green LED Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

2-2 Routine maintenance on the OPC Procedure 2-1 Maintaining the OPC This procedure provides the routine steps that need to be performed when maintaining an OPC with or without a backup OPC. Maintenance should be performed every 4 months or earlier. Any troubleshooting that is necessary for this procedure will likely involve system-wide information. Therefore, if errors occur while you are performing this procedure, contact your next level of support or your Nortel Networks support group. Step With operational backup OPC present 1 Set the primary OPC s port B to terminal. (See Chapter 1, Configuring the OPC ports in System Administration Procedures, 323-1111-302 for details.) 2 Connect a VT100-compatible terminal to the primary OPC port B. (See Chapter 1, Configuring the OPC ports in System Administration Procedures, 323-1111-302, for details.) 3 Shut down and remove the primary OPC. 4 Ensure that the backup OPC becomes active and has associations to all network elements. 5 Insert the primary OPC. 6 Ensure that the boot diagnostics are displayed on the primary OPC. 7 Ensure that the boot diagnostics pass on the primary OPC. 8 Ensure that there are no boot diagnostic error or fail messages. 9 Ensure that the primary OPC becomes active. 10 Ensure that the backup OPC becomes inactive. 11 Return port B to its original setting. 12 Provided there is a DDS tape drive, clean the DDS tape heads according to Cleaning the OPC internal digital data storage (DDS) tape drive heads on page 2-5. 13 Replace the OPC save and restore tape, if applicable. continued S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Routine maintenance on the OPC 2-3 Procedure 2-1 (continued) Maintaining the OPC Step 14 Open the Event Browser and ensure that the following events are running every night: user profile data audit OPC data synchronization ring configuration audit (if applicable) connection audit (if applicable) OPC save to tape or cartridge (if applicable) 15 Open the Backup/Restore Manager and ensure that the network elements have been updating every night. 16 Set the backup OPC port B to terminal. 17 Connect the VT100-compatible terminal to the backup OPC port B. 18 Shut down and remove the backup OPC. 19 Ensure that the primary OPC remains active and has associations to all network elements. 20 Insert the backup OPC. 21 Ensure that the boot diagnostics are displayed on the backup OPC. 22 Ensure that the boot diagnostics pass on the backup OPC. 23 Ensure that there are no boot diagnostic error or fail messages. 24 Ensure that the primary OPC remains active. 25 Ensure that the backup OPC becomes inactive. 26 Return port B to its original setting. 27 Provided there is a DDS tape drive, clean the DDS tape heads according to Cleaning the OPC internal digital data storage (DDS) tape drive heads on page 2-5. 28 Replace the OPC save and restore tape, if applicable. Without operational backup OPC present 29 Set the primary OPC port B to terminal. (See Chapter 1, Configuring the OPC ports in System Administration Procedures, 323-1111-302 for details). 30 Connect the VT100-compatible terminal to the primary OPC port B. (See chapter 1, Configuring the OPC ports in System Administration Procedures, 323-1111-302 for details.) 31 Shut down and remove the primary OPC. Note: OAM&P is lost to all network elements. 32 Insert the primary OPC. 33 Ensure that the boot diagnostics are displayed on the primary OPC. continued Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

2-4 Routine maintenance on the OPC Procedure 2-1 (continued) Maintaining the OPC Step 34 Ensure that the boot diagnostics pass on the primary OPC. 35 Ensure that there are no boot diagnostic error or fail messages. 36 Ensure that the primary OPC becomes active. 37 Return port B to its original setting. 38 Provided there is a DDS tape drive, clean the DDS tape heads according to Cleaning the OPC internal digital data storage (DDS) tape drive heads on page 2-5. 39 Replace the OPC save and restore tape, if applicable. 40 Open the Event Browser and ensure the following events are running every night: user profile data audit OPC data synchronization ring configuration audit (if applicable) connection audit (if applicable) OPC save to tape or cartridge (if applicable) end S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Routine maintenance on the OPC 2-5 Procedure 2-2 Cleaning the OPC internal digital data storage (DDS) tape drive heads A build-up of magnetic dust and debris might accumulate after prolonged operation of the internal digital data storage (DDS) tape drive. Therefore, the DDS drive heads must be cleaned under the following circumstances: when a new operations controller (OPC) is installed in the system if the tape drive is used less than once a week, clean the tape heads before each use if the tape drive is used at least once a week, clean the tape heads after every 25 hours of use before every system software upgrade Note: If you suspect that a tape has contaminated the heads with tape drive lubricant, clean the tape heads three times consecutively. The tape is not useable if the OPC software consistently fails with tape errors, even after cleaning the tape drive. The LEDs on the tape drive indicate tape drive status, for example, when the tape drive encounters excessive errors because of dirty heads or defective tapes. A flashing green LED indicates that the tape read or write operation generated excessive errors. The LED flashes slowly for read problems and quickly for write problems. The flashing green LED does not necessarily indicate a loss of data or that the operation of the DDS tape drive is affected. However, it can indicate the following conditions: the tape drive heads are dirty and must be cleaned using a cleaning tape the tape is a pre-recorded audio tape and is not recognized by the DDS tape drive Note: The amber LED on the tape drive unit is also lit if a pre-recorded audio tape is inserted. continued Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

2-6 Routine maintenance on the OPC Procedure 2-2 (continued) Cleaning the OPC internal digital data storage (DDS) tape drive heads the tape is damaged or nearing the end of its life and must be replaced Note 1: If the red Fail LED on the OPC is also lit, clear the associated OPC circuit pack fail alarm by following the procedures in 323-1111-543, Alarm and Trouble Clearing Procedures, before assuming that the tape is damaged. Note 2: If cleaning the DDS drive head does not correct the flashing LED condition, replace the DDS tape. The tape is not useable if the OPC software fails consistently with tape errors even after cleaning the tape drive. The life of a DDS tape is measured by the number of passes (read, write, or rewind operations) it can support. Available DDS tapes support 1000 to 2500 passes. Because each read or write pass requires a rewind, a typical DDS tape is good for 500 to 1250 read/write operations. Applications such as save to tape and software upgrades require several read/write operations. Because not all applications require the same number of read/write operations, the life of a DDS tape depends on the type of applications for which it is used. The following table summarizes the expected useful life of a DDS tape that can support 1000 read/write operations. Application Read/write operations required Useful life (runs) Save-to-tape operations 5 200 Software upgrades 5 200 Installing OPC software loads using the localopcinstall UNIX command Checking the validity of files on the tape using the verify_tape UNIX command 12 83 11 91 Note: Dirty DDS tape drive heads contaminate DDS tapes and reduce their expected life. continued S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

Procedure 2-2 (continued) Cleaning the OPC internal digital data storage (DDS) tape drive heads Routine maintenance on the OPC 2-7 Requirements To clean the heads of the DDS drive, use a DDS certified cleaning cassette (NT7E24TB). Note: DDS cleaning tapes must be ordered with each OPC. CAUTION DDS tapes have been specifically designed to meet the demands of information storage. You must use a certified data grade 4-mm DDS tape in the OPC. The DDS data tape and cleaning tapes must bear the following DDS logo in order to be certified. CAUTION Risk of data loss Keep DDS tapes away from varying environmental conditions such as humidity, dust, extreme hot and cold temperatures, and magnetic fields and devices. When handling DDS tapes around equipment, be aware that data on the tape can be damaged or lost as a result of electrostatic discharge. Always ground yourself before handling the tape. Make sure the cassette is at room temperature before using it in the OPC tape drive. Step 1 Insert the DDS cleaning cassette in the tape drive with the write-protect opening at the top. The DDS drive loads and runs the cassette for about 10 seconds and then ejects it. Note: Each time the cleaning cassette is used, the tape advances over an unused portion. Eventually, the entire tape is used (after approximately 50 uses) and a new cleaning cassette is required. When the cleaning cassette no longer advances when inserted in the tape drive, replace the DDS cleaning cassette. 2 Remove the DDS cleaning cassette from the tape drive. end Routine Maintenance Procedures 323-1111-546 Rel 14 Standard Feb 2001

2-8 Routine maintenance on the OPC S/DMS TransportNode OC-3/OC-12 NE TBM Vol 5 323-1111-546 Rel 14 Standard Feb 2001

SONET Transmission Products S/DMS TransportNode OC-3/OC-12 NE TBM Routine Maintenance Procedures Copyright 1992 2001 Nortel Networks, All Rights Reserved The information contained herein is the property of Nortel Networks and is strictly confidential. Except as expressly authorized in writing by Nortel Networks, the holder shall keep all information contained herein confidential, shall disclose it only to its employees with a need to know, and shall protect it, in whole or in part, from disclosure and dissemination to third parties with the same degree of care it uses to protect its own confidential information, but with no less than reasonable care. Except as expressly authorized in writing by Nortel Networks, the holder is granted no rights to use the information contained herein. Nortel Networks and S/DMS TransportNode are trademarks of Nortel Networks. VT100 is a trademark of Digital Equipment Corporation. UNIX is a trademark of X/Open Company Ltd. 323-1111-546 Rel 14 Standard February 2001 Printed in Canada