Tdm-Bus (Tdm Bus) - Avaya S8700 Maintenance Manual

Maintenance Object Repair Procedure

TDM-BUS (TDM Bus)

MO's Name (in
Alarm Log)
TDM-BUS
TDM-BUS
TDM-BUS
1. P is the port network's number. Use list cabinet to find the port network(s) contained in a given
cabinet.
Description
Each port network has a pair of TDM buses, designated TDM bus A and TDM bus
B, each with 256 time slots. This division allows for duplication of control
channels and dedicated tone time slots. The first five time slots on each bus are
reserved for the control channel, which is active on only one bus at a time in each
port network. The next 17 time slots are reserved for system tones such as dial
tone, busy tone and so on. As with the control channel, these time slots are active
on only one bus, A or B, at a time. The rest of the time slots on each bus are for
general system use such as carrying call-associated voice data. The 17
dedicated tone time slots that are inactive can also be used for call processing
when every other available time slot is in use.
When the system initializes, the control channel is on TDM bus A and the
dedicated tones on TDM bus B in each port network. If a failure occurs on one of
the two buses, the system will switch any control, tone and traffic channels to the
other bus. Service will still be provided, though at a reduced capacity.
The set tdm PC command has the effect of putting both the control channel and
tone time slots on a specified bus, A or B. P specifies the port network's number,
and C specifies the TDM bus, A or B. Throughout this discussion, PC refers to a
specific TDM bus. References to port circuit packs include every circuit pack that
terminates on the TDM bus, including the following service circuit port boards: Call
Classifier (TN744), Integrated Announcement (TN750), Maintenance/Test
(TN771), Speech Synthesizer (TN725B), Tone Detector (TN748 or TN420). Other
terms used are:
Control Channel Bus: the TDM bus carrying the active control channel
Non-Control Channel Bus: the TDM bus with the inactive control channel
Tone Bus: the TDM bus carrying the active tone time slots
Non-Tone Bus: the TDM bus with the inactive tone time slots
8-1108 Issue 1 May 2002
Alarm
Level Initial Command to Run
MAJOR test tdm P
MINOR test tdm P
WARNING test tdm P
1
Full Name of MO
TDM bus
TDM bus
TDM bus
555-233-142