4. System Components System Manual
Page 2-32 8/09 76.7300FP11/2, Rev A
Power Supply Unit (PSU)
4.17 This section describes the features and circuitry of the 81.CM3501-R5
PSU module used in the Tellabs 7345 Switch.
4.18 Each hot-swappable PSU supports dual -48 Vdc power feeds via
connectors on the unit’s faceplate. This dual-feed configuration allows a service
provider to choose the level of redundancy they desire for power to the system. A
single PSU may be deployed with dual feeds providing resiliency against power
cable cuts within the office. A second PSU may be deployed to protect against a
PSU failure.
4.19 The PSUs normally operate as load sharing. When a PSU fails, the other
PSU carries the entire system load. No disruption occurs.
4.20 The dual -48/60V input PSU supports single and dual configurations. For
a description and setup procedures, refer to PSU Redundancy Options (Tellabs
7345 Switch only), page 2-64.
Front Panel LEDs
4.21 For PSU LED placement, refer to Figure 4.6, page 2-32. For PSU LED
descriptions and states, refer to Table 4.4, page 2-32.
Figure 4.6 PSU LED Placement
Table 4.4 PSU LED Descriptions
LED Status Description
UB1 green Power is connected to the UB1 input.
off Power is not present at the UB1 input.
UB2 green Power is connected to the UB2 input.
off Power is not present at the UB2 input.
+12 V green The +12 V output power is present.
off The PSU has no power, the PSU has failed, or the LED is
not functional.
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