363-206-285
Circuit Pack Descriptions
7-94 Issue 3 June 2001
Figure 7-36. TMUX Circuit Pack Block Diagram
Control Circuitry 7
The BBG20 TMUX circuit pack interfaces with the SYSCTL via the intra-shelf
control bus. Redundancy in the intra-shelf control bus assures the level of control
required to perform protection switching and alarming of a faulty circuit pack. The
BBG20 TMUX provides maintenance elements for reporting the status of the
circuit pack, status of the incoming STS-1 and DS3 signals, as well as the circuit
pack inventory information (
CLEI
code, date of manufacture, etc.). These
maintenance elements are used by the SYSCTL for fault detection and isolation.
Conversely, the BBG20 TMUX responds to control signals from the SYSCTL
(such as active and fault LED controls).
DS3
Receiver
Hybrid
Protection
Relays
DS3
Driver
LBO
Intrashelf
STS-1
To / Fr o m
OLIU CPs
From
From
Shelf
-48V Fuses
SYSCTL
-48V A
-48V B
Timing
Control
To / Fr o m
To / Fr o m
Companion CP
To / Fr o m
DS3
(Service &
Protection)
TGS CPs
(Service &
Protection)
DSX-3
DS1
To
VT1.5
To
STS-1
Mapping
M13
28
DS1s
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