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8. Connecting/Disconnecting the
Cables at the Cabinets
This procedures in this part describe the various cabling connections to the SRUs in
the system. The connections include:
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•
•
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Cabling connections to the office cross-connect panel and external systems are
shown in Fig. 8-1.
Connections are made to the SRUs through cutouts in the metal backpanels of the
cabinets. Cables are routed down the left side of each cabinet (facing from the rear).
The cables leave the cabinet via a space below the rear door. Cables are typically
dressed with plastic ties.
The pre-installation wiring contractor makes the cross-connections from the office
cross-connect panel to the building wiring or other distribution frames before the
systemis installed. If for some reason the cross-connections have not been made,
refer to Part 9 for instructions. These cross-connections are then routed to the
central office, the host PBX, or via the building wiring to LAN Interface Units
(LIUs), M4000-series terminals, and personal computers.
the cabling that serves as the SCSI (Small Computing Systems Interface) bus
for systems using the SCSI interface (that is, the cables inter-connecting the
Primary Processor, disk storage SRUs, and tape units)
the cabling for systems using the SASI interface (Shugart Associates Systems
Interface), that is, the cabling between the Primary Processor, the 80 Megabyte
Mass Storage SRU, and, optionally, the 350 Megabyte Mass Storage SRU
direct cabling connections from RS-232-C devices to the Primary Processor or
Applications Processors (to be used with Northern Telecom's authorization
only)
cabling connections to the office cross-connect panel from the interface SRUs
(for example, the LANlink and Analog Link SRUs)
cabling from the Digital Trunk Link SRU to DS1-compatible devices
connecting the ac power input cable to the Input Jumper Assembly.
Practice 450-1011-201
9
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