363-206-305
Circuit Pack Descriptions
7-2
Issue 3 June 2000
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Optical Interfaces
— 22D-U OC-3 (IS-3) OLIU
— 22F/22F-U/22F2-U OC-3 (Intermediate Reach) OLIU
— 22G-U/22G2-U/22G3-U/22G4-U (OC-3 Long Reach) OLIU
— 26G2-U OC-1 optical line interface unit (OLIU)
— 28G-U/28G2-U OC-3 optical line interface unit (OLIU)
— 29G-U 1310 OC-12 (nm Long Reach) OLIU
— 29H-U 1550 OC-12 (nm Long Reach) OLIU
Control Circuit Packs
7
The DDM-2000 FiberReach Multiplexer uses one main control circuit pack for the
SYSCTL. The user panel on DDM-2000 FiberReach provides the physical CIT
interface and the alarm and status LEDs. The control system provides user
interfaces to the system and controls, monitors, and reports the status of the
signal transmission through the DDM-2000 FiberReach Multiplexer. 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 FiberReach in a subnetwork can
communicate with the control system of other FiberReach 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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