Mike's PBX Cookbook

NT5D61 Input/output Disk Unit with CD-ROM (IODU/C)

This procedure describes how to replace a faulty IODU/C card.

See Software Input Output Administration (NN43001-611) for a description of all maintenance commands, and Software Input Output Reference - System Messages (NN43001-712) for interpreting system messages.

CAUTION! Service Interruption!
At some point in this procedure the system warm starts, causing a momentary interruption in call processing.

Before replacing the card, make a backup copy of the customer database on a 4MB diskette by using the data dump routine:

Performing a data dump to back up the customer database

  1. Log on to the system
  2. Load the Equipment Data Dump Program (LD 43).
  3. When "EDD000" appears on the terminal, enter EDD To begin the data dump
  4. When "DATADUMP COMPLETE" and "DATABASE BACKUP COMPLETE" appear on the terminal, enter **** To exit the program

CAUTION! - System Failure!
If the data dump is not successful, do not continue; contact the technical support organization. A data dump problem must be corrected before proceeding. .

Accessing the cores

1. To access the Core during the replacement procedure, connect a terminal to the J25 port on the I/O panel in the inactive Core Module or Core/Network Module.
2. To communicate with the processor, you must use the following settings on the terminal:

  • 9600 baud
  • 7 data
  • space parity
  • 1 stop bit
  • full duplex
  • XOFF

3. If using only one terminal or a switch box, switch the connection from Core to Core as needed.

Splitting the Core

1. Verify that the disk drives are synchronized:
LD 137    - to load the program
STAT      - to get the status of the disk drives

If the disks are synchronized, proceed with Step 2. If they are not synchronized, execute the SYNC command:

SYNC      - Synchronize the drives
****      - Exit the program

2. Verify that the clock controller associated with the faulty IODU/C is inactive.
If it is not, switch clock controllers:

LD 60     - Load the program
SSCK      - Get the status of the clock controllers
SWCK      - Switch clock controllers (if necessary)
****      - Exit the program

3. Verify that the IODU/C card being replaced is on the inactive Core:

LD 135    - Load the program
STAT CPU  - Check CPU status
TEST CPU  - Test the CPU

If the IODU/C card being replaced is on the inactive Core, proceed with step 5. If the IODU/C being replaced is not on the inactive Core, swap Cores and verify again:

SCPU      - to swap CPUs
STAT CPU  - to check CPU status

4. Verify that the faulty IODU/C card is inactive. It may be necessary to switch IODU/Cs.

LD 137    - Load the program
STAT      - Get the status of IODU/C.
SWAP      - Switch IODU/Cs (if necessary).

5. Set the MAINT/NORM switch on the CP card to MAINT on the active Core.
6. Set the ENB/DIS switch on all CNI cards to DIS on the inactive Core.
7. Perform the following three steps in uninterrupted sequence:

a. Press and hold the MAN RST button on the CP card in the inactive Core.
b. Set the MAINT/NORM switch on the CP card in the inactive Core to MAINT.
c. Release the MAN RST button.

Replacing the IODU/C card in a redundant system

1. Set the ENB/DIS switch on the faulty IODU/C card to DIS.
2. Unhook the locking devices and remove the IODU/C card.
3. Remove the round 1/2" diameter IODU/C Security Device from the black round Security Device holder on the top right corner of the IODU/C card being replaced.
4. Put the IODU/C card being replaced into a static bag and box.

5. With the Nortel side facing upward, slide the Security Device between the security device holder and the holder clip in the new IODU/C card. Do not bend the clip more than necessary when inserting the Security Device. Ensure that the Security Device is securely in place.

6. Insert the new IODU/C card into the following slots: For NT5D21 Core/Net Modules, insert the IODU/C card in slots 17,18, and 19.

7. Lock the locking devices by pushing them gently towards the faceplate. Set the ENB/DIS switch to ENB.
A blinking letter "E" and number "5" displayed indicates that a failure occurred. In that case, reseat the Security Device in its holder and reinsert the card.

8. Press the MAN RST button on the CP card.
Once the keycode is validated against the Security Device, the Install menu is displayed.

9. At the Install menu, select <o> to copy the software from the active Core.
10. Select <a> to confirm.
11. Select <a> to confirm the software release to be copied.

12. When the software is installed successfully, press to install CP-software from the hard disk to Flash EEPROM, and install CP-BOOT ROM. Follow the screen directions until the Main Menu returns.

13. When the Main Menu returns, select to install IOP-ROM.
14. Select <a> to continue with the IOP-ROM upgrade
15. At the Install Menu, select the following options in sequence to copy the customer database from the redundant disk.

<d> to go to the Database menu
<d> to copy the database from the redundant disk
<y> to confirm installation status summary
<a> to confirm database copy

16. Remove the diskette from the IODU/C card and select <q> to quit and reload the system.
17. Select <y> to confirm quit
18. Select <a> to reboot the system.

The system automatically performs a sysload and system initialization during which several messages appear on the system terminal. Wait until initialization has finished (INI messages are no longer displayed on the system terminal) before continuing.

19. In the inactive Core, enable the NT6D65 CNI cards by setting the ENB/DIS faceplate switches to ENB.
20. In the inactive Core, perform the following steps in uninterrupted sequence:

a. press and release the MAN RST button
b. when SYS700 messages appear on CP LCD display, set the MAINT/NORM switch to NORM.

Within 60 seconds, the LCD displays the following messages, confirming the process.


An "HWI534" message from the CPSI or SDI port indicates the start of memory synchronization. Within 10 minutes, an HWI533 message on the inactive Core CPSI or SDI TTY indicates the memory synchronization is taking place. Wait until the memory synchronization is complete.

21. Switch the NORM/MAINT switch on the active CP card to NORM.
22. Synchronize the disk drives:

LD 137    - Load the program
SYNC      - Synchronize the drives. Synchronization may take up to 50 minutes.
****      - Exit the program
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