Tdm-Bus (Tdm Bus) - Avaya DEFINITY Server CSI Maintenance Manual

Maintenance Objects

TDM-BUS (TDM Bus)

MO Name (in
Alarm Log)
TDM-BUS
TDM-BUS
TDM-BUS
The TDM Bus consists of a duplicated TDM Bus on each port network: TDM Bus
A and TDM Bus B. Each TDM Bus consists of 256 time slots. The first five time
slots on each bus are called the Control Channel. The Control Channel is active
on only one bus at a time in each Port Network. The next 17 time slots are
reserved for dedicated tones (that is, dial tone). These time slots are called the
dedicated tone time slots and only one bus at a time carries the dedicated tones.
The rest of the time slots on each bus are for general system use (that is, phone
call).
On system initialization, the Control Channel is on TDM Bus A and the dedicated
tones on TDM Bus B in each Port Network.
Terminology:
Control Channel Bus - The TDM Bus control channel is on.
Non-Control Channel Bus - The TDM Bus control channel is NOT on.
Tone Bus - The TDM Bus dedicated tone time slots are on.
Non-Tone Bus - The TDM Bus dedicated tone time slots are NOT on.
TDM Bus Fault Detection and Isolation
Procedure
TDM Bus faults are most likely caused by a defective circuit pack connected to the
backplane or bent pins on the backplane. It is possible that a circuit pack can
cause a TDM Bus fault but still exhibit trouble-free operation. For example, the
insertion of an MBUS (Memory Bus) only circuit pack can bend the TDM Bus pins
on the backplane and short two leads together. Since the TDM Bus is a shared
resource, automatic identification of the cause of a TDM Bus fault is difficult. If a
TDM Bus problem is suspected, the system technician should run the test tdm P
system technician command. If any of the resulting tests fail, then the system
technician must manually perform a TDM Bus isolation procedure to identify the
cause of the problem.
1656
Issue 5 October 2002
Alarm Initial Command
Level to Run
MAJOR test tdm P
MINOR test tdm P
WARNING test tdm P
Full Name of MO
TDM Bus
TDM Bus
TDM Bus