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When planning the cabling scheme for a new TSR system, determine the most effective cable routing method for the equipment by determining space available and considering any site restrictions.
This section describes general cabling considerations for the TSR. External TSR system cables can be suspended from the ceiling for systems mounted on a concrete floor or routed below the floor for systems mounted on a raised floor. If the cables are run below a raised floor, they must be directed in front of the row of bays.
The TSR bay cables route as follows:
The fiber and Ethernet cables route up through the floor or down from the ceiling and through vertical cable channels at the left and right front corners of the bay. Refer to Figure 4-1.
Figure 4-1. Internal Vertical and Horizontal Cable Channels
It is recommended that 2.0 mm thick (.078-in.) optical cables be used to interface to the TSR system.
CAUTION To prevent equipment damage due to improper air flow, do not route cables directly above TSR bays.
- Power and safety ground cables descend from directly above the bay to the rear of the BIP or route up through raised floors at either the left or right side of the bay in vertical cable channels.
- Ethernet 100BaseT and 10BaseT cables route in the vertical cable channels with the fiber cables. Route the cables from either the left or right side of the bay.
- Fiber cables also route in the vertical cable channel at either the left or right side of the bay.
Fiber Cable Routing
Industry standard ducts keep fibers separate from other types of wires. In planning your system configuration and keeping future system expansions in mind, consider the following:
- Up to eight fibers can be connected to each router module (38 router modules per bay = 304 fibers)
- A 14 bay system completely filled with modules could have as many as 4,256 fibers
NOTE It is recommended that a cross-connect patch panel be used for fiber connections between TSR bays and interface equipment. If cables are routed point-to-point from interface equipment to TSR bays, the handling, routing, and system flexibility can be compromised. For example, in-service fibers could be disturbed or damaged upon additional system installations or maintenance.
Using a patch panel approach as opposed to a cross-connect solution introduces a patch cord for each link (two additional connector interfaces contributing about 0.5 db. of loss).Fiber Management Frames
The customer is responsible for purchasing and installing the fiber management frame for their system fiber-optic cables. A Siecor fiber management system is recommended for overhead cable routing of multiple system configurations.
Central Office Alarms and Cabling
Central office alarms, when connected at the CO, report the occurrence of events such as a component failure. Alarms originate in either a bay controller or server.
The alarm task resides in the bay controller and is responsible for setting and clearing of alarms as well as maintaining an alarm database. A DB-15 connector on the TSR bay provides the ability to connect the visual and audible alarms to your central office system.
Central office alarm cables route to the TSR bay using customer supplied alarm cables. The alarm cables connect to the TSR bay via a D-type, 15-pin connector. The DB-15 connector is located below the BIP on the front of the TSR bay. Refer to Figure 4-3.
Figure 4-2. CO Alarm Connector
Configuring Central Office Alarm Cable Connections
The TSR has three sets of relays to generate central office alarms. When connected at the CO, the relays provide audible (bells, chimes, gongs) and visual (red, amber) indicators in the CO. Refer to Figure 4-3 for the pinout.
Figure 4-3. DB-15 Pinout
For a more detailed explanation on CO alarm installation, see "Terabit Switch Router Install Guide."
Customer Installable Cables
Customer installable cables are those cables that interconnect TSR bay modules to each other and to external customer equipment.
Figure 4-1 provides information for ordering these cables.
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Avici Systems Inc.
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Last Updated: 06/11/01 at 10:42:23
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