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Chapter 2
Preparing for Installation
Depending on your configuration type, plan accordingly so that the CO rack accommodates your needs.
Use
amount of rack space should not exceed 42 RUs. If your total configuration exceeds 42 RUs, either
replan your configuration or use more than one rack to house the Cisco 6160 system components.
Table 2-2
Rack Space Calculation for Cisco 6160 System Configurations
Line
Instructions
Cisco 6160 with a POTS Splitter Configuration
1
Total number of Cisco 6160 chassis in the rack—Maximum is three chassis per rack (include
subtending host and subtended node chassis)
2
Total number of third-party POTS splitters in the rack
3
Number of RUs required for each POTS splitter
4
Multiply line 2 by line 3 to determine the total POTS splitter space requirement
5
Multiply 11 RUs by the total number of Cisco 6160 chassis on line 1
6
Multiply 1 RU by the total number of Cisco 6160 chassis on line 1
7
Add lines 4 through 6 to obtain the total number of RUs needed for a Cisco 6160 with a POTS splitter
configuration.
Cisco 6160 Without a POTS Splitter Configuration
8
Total number of Cisco 6160 chassis in the rack—Maximum is three chassis per rack (include
subtending host and subtended node chassis)
9
Multiply 11 RUs by the total number of Cisco 6160 chassis on line 8
10
Multiply 1 RU by the total number of Cisco 6160 chassis on line 8
11
Add lines 9 and 10 to obtain the total number of RUs needed for a Cisco 6160 without a POTS splitter
configuration.
1. See the documentation that accompanied the third-party POTS splitter to determine the number of RUs required. One RU is equal to 1.75 inches
(4.45 cm.).
2. One RU is recommended for cabling needs and the intake plenum.
2.2.2 Power Requirements
The CO power source or rectifier supplies external power to the system as –48VDC from the fuse and
alarm panel. The nominal voltage is –48VDC, the minimum operating value is –40.5VDC, and the
maximum operating value is –75VDC
Power connections from the fuse and alarm panel are wired to the power terminal block connectors on
the Cisco 6160 backplane. The power terminal block connectors are located behind each corresponding
PEM. The PWR 1 terminal block connector is for the primary PEM and the PWR 2 terminal block
connector is for the secondary (redundant) PEM. Only one power connection is necessary for system
operation.
Before you connect the system to a power source, verify that the power source is properly grounded and
Note
that it falls within the internal power supply rating.
OL-2190-02 B0
Table 2-2
to calculate the rack space necessary for your Cisco 6160 system configuration. The total
1
2
2
Cisco 6160 Hardware Installation Guide
Site Requirements
Calculation
2-13