Lucent Technologies 555-233-119 How to Replace a Tone-Clock Circuit Pack, Port Networks with a Single Tone-Clock Circuit Pack

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance Objects
3-1129TONE-BD (Tone-Clock Circuit Pack)
3
How to Replace a Tone-Clock Circuit Pack
Replacing the Tone-Clock circuit p ack is a service-disrup ting proced ure on Port
Networks, because the Tone-Clock circuit p ack is always needed to generate
clocks for its network. When the circ uit pack is removed, all c alls are dropped
immediately. However, if the Tone-Clock is removed for replacement, the System
Emergency Transfer feature is activated within millisec onds, and the entire
system is disrupted; no c alls can be pl aced, and existing calls are dropped .
When replacing the Tone-Clock circuit pa ck, always replace it with a TN2182
Tone-Clock circuit pack. The TN2182 may be used in all country configurati ons.
Port Networks with a Single Tone-Clock Circuit
Pack
This procedure is destructive.
1. Pull out the defective Tone-Clock circuit pac k. This will remove the clocks
and cause the system to ac tivate emergency measures:
■The system will immediately go into the Emergenc y Transfer state.
2. Insert a new Tone-Clock circuit pack. The system will d etect the return of
the clocks and will automatic ally recover as follows:
■The system will perform a reset system 2 (system cold 2 restart)
automatically. First, all red LEDs of the PPN will come on and off
within 30 seconds.
3. If the red LEDs come on but do not g o off within 30 seconds, p ull the
circuit pack out a nd reseat it. If the LEDs perform as expec ted this time,
continue with step 4. Otherwise, there may be a problem with the TDM
bus; possibly a b ent pin in the Tone-Clock circuit pac k slot. Follow the
directions in the TDM-BUS maintenance section.
4. If the red LEDs did light, as exp lained above, then go to Step 6. If the red
LEDs do NOT light, as explained above, then go on to Step 5.
5. Restart the affected Port Network:
■Restart the system via the reset system 2 command.
6. Test the new Tone-Clock circuit p ack to verify that it is functioning properly,
using the test tone-clock PC long command, and v erify that the system is
operational by plac ing several phone c alls. Where possible, try calls into,
out from, and within the affected Port Network.