Determining the Operating Status
Evaluating Power Loads for a Two-Power Supply Switch
Beta Draft Confidential
5-84/5/03 CBX 500 Multiservice WAN Switch Hardware Installation Guide
• CBX 500 IOPs have a maximum power consumption limit of 100 watts per slot.
Using this number, you can calculate the worst-case power consumption on the
switch backplane, as follows: 14 x 100 (IOMs) + 260 (SPs) + 75 (fans) = 1735
watts.To obtain the input power, divide this number by the power supply
efficiency, 0.70.
Problems should not occur if the configuration does not exceed the 1050 watt limit.
Table 5-7 describes the breakout of the total power used by CBX 500 SPs, IOMs, and
fan assemblies.
Table 5-7. Power Consumption by CBX 500 Components
Components Power Consumption (Watts)
Switch Processor (SP) Modules
Switch Processor (SP) Pair
(single-chassis power supply)
260
(active SP- 170)
(standby SP - 90)
I/O Processor (IOP) Modules
1-port OC-12c/STM-4
(with NRTS)
65
(82)
4-port OC-3c/STM-1 ATM (electrical and optical)
(with NRTS)
65
(80)
4-port Ethernet 91
4-port channelized DS3/1/0 Frame 75
6-port DS3 Frame/IP 90
8-port T1 and E1 ATM
(with NRTS)
65
(83)
8-port DS3 and E3 ATM
(with NRTS)
75
(91)
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