DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1703TDM-BUS (TDM Bus)
9
TDM-BUS (TDM Bus)
Each port network has a pair of TDM busses, 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 all other available time slots are 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 busses, 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 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 all circuit packs that
terminate on the TDM bus, including the Expansion Interface TN570, and 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
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
1. P is the Port Network number. Use list cabinet to find the port network(s) contained in a
given cabinet.
Full Name of MO
TDM-BUS MAJOR test tdm P TDM Bus
TDM-BUS MINOR test tdm P TDM Bus
TDM-BUS WARNING test tdm P TDM Bus
