Juniper PTX Series - Maintaining the PTX5000 Power System

• Avoid bending fiber-optic cable beyond its bend radius. An arc smaller than a few
inches can damage the cable and cause problems that are difficult to diagnose.
• Frequent plugging and unplugging of fiber-optic cable into and out of optical
instruments, such as analyzers, can cause damage to the instruments that is expensive
to repair. Instead, attach a short fiber extension to the optical equipment. Any wear
and tear due to frequent plugging and unplugging is then absorbed by the short fiber
extension, which is easy and inexpensive to replace.
• Keep fiber-optic cable connections clean. Small microdeposits of oil and dust in the
canal of the transceiver or cable connector could cause loss of light, reducing signal
power and possibly causing intermittent problems with the optical connection.
Related
Documentation
PTX Series PIC Description on page 36•
• Maintaining the PTX5000 PICs on page 112
• Troubleshooting the PTX5000 PICs and PIC Cables on page 147
Maintaining the PTX5000 Power System
Purpose For optimum performance, verify the condition of the power supplies and grounding.
Action On a regular basis:
• Periodically inspect the site to ensure that the grounding and power cables connected
to the packet transport switch are securely in place and that no moisture is
accumulating near the packet transport switch. To review grounding and site wiring
requirements for the packet transport switch, see “PTX5000 Chassis Grounding Cable
and Lug Specifications” on page 259..
• Check the status of the power supplies by issuing the show chassis environment pdu
command.
• Make sure that the DC power cables are arranged so that they do not obstruct access
to other packet transport switch components.
• Routinely check the status LEDs on the PDU and PSM faceplates and the craft interface
to verify that the power supplies are functioning normally. For more information about
the PDU and PSM LEDs, see “PTX5000 Power Distribution Unit LEDs” on page 42 and
“PTX5000 Power Supply Module LEDs” on page 43..
During normal operation:
• The green PDU OK LEDs light to indicate that the PDUs are functioning normally.
• Each green –48 V 120 A LED on a DC PDU lights when the input is receiving source
DC power.
• Each CB ON LED on a DC PDU lights when the circuit breaker is on.
113Copyright © 2012, Juniper Networks, Inc.
Chapter 13: Maintaining Packet Transport Switch Hardware Components