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This chapter describes periodic maintenance procedures, troubleshooting procedures, and the replacement of major parts for the Release 3.0 AXIS.
Most monitoring and maintenance of the AXIS shelf is done via the operating system software. Preventive maintenance of the AXIS shelf hardware is minimal and requires only the following:
Troubleshooting the AXIS shelf
This section describes basic troubleshooting steps to be taken for some of the more obvious node failures (refer to Table 7-1). This is not an exhaustive set of procedures, and does not take into account any of the diagnostic or network tools available to troubleshoot the AXIS shelf. Refer to the CLI Display Commands in Chapter 5, "Service Configuration", for information on commands and command usage.
General Troubleshooting Procedures
The AXIS shelf runs self tests continuously to ensure proper function. When the unit finds an error condition that affects its operation, it downs the card or line that is affected. If it is caused by a card failure and there is a redundant card, the failed card is downed and the standby card becomes the active card.
The FAIL lights on the cards indicate that the system has found these cards defective in some mode, and now considers them as failed cards. It is at this point that you would use Table 7-1 to find the cause and obtain the information on replacing the failed component.
Table 7-1 : Troubleshooting the AXIS shelf Node
After an alarm occurs, use the AXIS shelf software to isolate the problem. (Refer to Troubleshooting the AXIS shelf for troubleshooting information). If an the AXIS shelf part has failed, then it must be replaced.
Parts should be replaced only by qualified personnel who have taken the StrataCom training courses or have been trained by a qualified system manager. For assistance in diagnosing or replacing a failed part, call the StrataCom ISC representative.
When replacing a part, save the electrostatic bag, foam, and carton that the new part comes in. These packaging materials are needed for returning the failed part to StrataCom. Refer to Appendix D, "Customer Support" for instructions on ordering and returning the AXIS shelf parts.
The the AXIS shelf front cards are as follows:
When a card has failed, the red FAIL light for that card turns on. Before replacing it, check to see if the card only needs to be reseated and check that the appropriate back card is correctly installed. After reseating the card, wait for it to run its self-tests to see if the ACTIVE light comes on. If the card is seated correctly, but the FAIL light is still on, replace the card.
When replacing a card that has no redundant equivalent, the service provided by that card will be disrupted. Replacing a non-redundant ASC or BNM card will bring down the entire shelf. Replacing a FRSM card will bring down the channels that are serviced by that card.
To remove a front card:
To install a front card:
Back cards are retained through two screws: one at the top of the faceplate and one at the bottom of the faceplate. Back cards contain very few active components (if any) and should rarely need replacing.
To remove a back card:
To install a back card:
Replacing a DC Power Entry Module
DC Power Entry Modules (PEMs) contain few active components so they should rarely need replacement. Access is from the back of the shelf. To remove a PEM, proceed as follows:
Replacing the Cooling, Booster, Plenum, and AC Power Assemblies
To replace the assembly:
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Symptom
Probable Cause
Remedy
No front panel LEDs are lighted.
Circuit breakers on the AXIS shelf Power Entry Module(s) switched off.
Press in the black button on power entry modules to switch on circuit breakers. If problem persists, pull all cards and power supplies out to see if a shorted card or supply exists.
The AXIS shelf power cord plug disconnected from AC supply.
Reconnect power cord.
Card front panel fail LED lit
Card failed self-test.
Check status of card at control console using dspcds screen. If alarm confirmed, try card reset (resetcd command). Finally, remove and replace the card.
Card stby LED on.
Card is off-line.
Not a problem as long as a primary card is active.
BNM major or minor LED on.
Service-affecting (major) or non-service affecting (minor) system fault.
Check event log to identify problem reported.
Network trunk failed.
Observe Port LEDs on each BNM.
Use control console dspln to locate failure.
Internal temperature is higher than normal resulting from blocked air flow or defective fan.
Check front of cooling assembly for freedom of air flow. Replace the assembly that may have failed or slowed. Check free air flow in plenum chamber, remove blockage if necessary.
ASM hist LED lit.
If no other alarm indications, a fault occurred in the past but has been cleared.
Press ASM history clear button. Check NMS event log to determine cause.
BNM Port LED is red.
Trunk is in local or remote alarm.
Use short BNM loopback cable line module connector for local test of trunk. Loop trunk at DSX-3 crossconnect to check cable.
ASC fail LED flashing
Downloading system software or configuration data.
Wait for download to complete.
If you accidentally attempt to insert a service module back card into slots 1, 2, 3, or 4 and then have difficulty in operating the shelf, examine the backplane pins and the connector on the wrongly inserted backcard to see if they have been bent or damaged.
