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Circuit Pack Descriptions
Issue 3 June 2000
7-7
Transmission/Timing Circuit Pack Interfaces
7
The main processor can read and write parameters on the transmission circuit
packs through a custom serial interface called the intrashelf control bus. These
circuit packs have a built-in serial link receiver which provides an address map
into the device. Through this interface, the processor accesses the custom
devices and circuit pack parameters, as well as a small EEPROM which stores
each circuit pack's inventory information (
CLEI
*
code, date of manufacture, etc.).
Through this link, the main processor can also light the faceplate LEDs on the
circuit packs.
Redundancy has been built into this bus to allow a pack to be switched out of
service in the event of a failure within a circuit pack.
Operation Interfaces
7
The SYSCTL supports all of the operations interfaces described in Chapter 6,
"Operations Interfaces."
OC-1 Transport Overhead Channel
7
The SYSCTL terminates an overhead channel from each Main slot in the shelf.
The overhead channel terminates the 192 kb/s section DCC.
Power Monitoring and Fan Control
7
The SYSCTL monitors the two
−
48 volt feeders and generates an alarm if one
fails. It also monitors AC power in a remote terminal application via a power minor
alarm input closure and can control the external fan, based on an on-board
temperature sensor. The system also monitors the fan control relay for contact
failure.
If the voltage to the shelf drops below the safe operating voltage, the system will
suspend normal operations and wait for safe operating voltage to return. This is
referred to as "brownout protection." Assuming a sufficient voltage level, an "L" will
be displayed on the SYSCTL. The BBG8/BBG8B operates in either integrated or
isolated grounding (-48VRTN not connected to frame ground) architecture
systems.
* COMMON LANGUAGE is a registered trademark and CLEI, CLLI, CLCI, and CLFI are
trademarks of Telcordia Technologies.
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