Symmetricom 1100, 1000 manual Replacing the IOC, Removing Two IOCs

Chapter 6 Maintaining and Troubleshooting the TimeProvider

Diagnosing the IOC

Removing Two IOCs

To remove both IOCs in a shelf, use the following procedure.

1.Save the contents of the Active IOC memory in the IMC by issuing the following command.

CPY-MEM:::::IOC,IMC,IOC;

This command may take more than two seconds to execute; if it does, then the In-Process response is issued. See the TimeProvider TL1 Reference Guide for more information on the CPY-MEM command.

2. Issue the following TL1 command to take the Standby IOC out of service:

ED-EQPT::IOCm:::IOCSTATE=OOSRV;

where m is 1 or 2, and corresponds to the location of the Standby IOC (1 is the left slot and 2 is the right slot).

Caution: Output signals are turned off when you place the second IOC out of service.

3.Attach a wrist grounding strap and connect it to the TimeProvider chassis.

4.Loosen the captive retaining screws and pull out on them to unseat the IOC from the shelf.

Warning: To avoid possible electrostatic damage to the IOC, place it in a static-free bag or on a static-free surface.

5.Place the IOC in a static-free bag or on a static-free surface.

6.Repeat Steps 2, 3, and 4 for the Active IOC.

7.Install new IOCs using the appropriate procedure in Replacing the IOC, on page 160.

Replacing the IOC

This section contains procedures for replacing IOC in three circumstances;

Replacing the only IOC in a shelf

Replacing one of two IOCs in a shelf

Replacing both IOCs in a shelf

160 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008