363-206-285
Circuit Pack Descriptions
7-2 Issue 3 June 2001
— 22D/22D-U OC-3 (IS-3) OLIU
— 22G-U/22G2-U/22G3-U
/22G4-U OC-3 (Long Reach) OLIU
— 24G-U OC-12 OLIU on OC-3 shelf
— 24H-U OLIU 1550 OC-12 (nm Long Reach) OLIU
— 26G2-U OC-1 OLIU
— 27G-U/27G2-U OC-3 (Dual OC-1 Long Reach) OLIU
— 29G-U 1310 OC-12 (nm Long Reach) OLIU
— 29H-U 1550 OC-12 (nm Long Reach) OLIU.
Compatibility 7
Note the following circuit pack compatibility requirements:
â– The BBG8/BBG8B SYSCTL circuit pack and the BBG9 OHCTL circuit pack
are both required and must be running compatible software.
Control 7
There are two control circuit pack slots, one for the SYSCTL and one for an
OHCTL. The control system controls and reports the status of the signal
transmission through the DDM-2000 OC-3. All system features are implemented
or supported through the control system. However, transmission is unaffected by
control system failure. If a controller does fail, protection switches are not done.
Therefore, if there is another circuit pack failure requiring a protection switch along
with the controller failure, service may be affected depending on the function of
the failed circuit pack. The control system continuously monitors the equipment to
determine if a protection switch is necessary and to provide equipment
performance information.
The control system in each DDM-2000 in a subnetwork can communicate with the
control system of other DDM-2000 NEs in that subnetwork via the SONET section
data communications channel (DCC). This allows a user at one point in the
subnetwork to control the shelves throughout the subnetwork.
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