• 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 ATM or SONET/SDH 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.
To clean the transceivers, use an appropriate fiber-cleaning device, such as RIFOCS
Fiber Optic Adaptor Cleaning Wands (part number 946). Follow the directions for the
cleaning kit you use.
After you have cleaned the transceiver on the fiber-optic PIC, make sure that the
connector tip of the fiber-optic cable is clean. Use only an approved alcohol-free
fiber-optic cable cleaning kit, such as the Opptex Cletop-S
®
Fiber Cleaner. Follow the
directions for the cleaning kit you use.
Related
Documentation
T640 Chassis Description on page 15•
• T640 PIC Description on page 79
• Connecting PIC Cables to the T640 Router on page 216
• Replacing T640 PIC Cables on page 346
Maintaining the T640 Power Supplies
Purpose For optimum router performance, verify the condition of the power supplies.
Action On a regular basis:
• Make sure that the power and grounding cables are arranged so that they do not
obstruct access to other router components.
• The power supplies require an unobstructed airflow at both the front and rear of the
chassis. Periodically check the site to ensure that both the air intake at the bottom
front of the chassis and the exhaust from the power supply faceplates are unobstructed.
• Periodically inspect the site to ensure that the grounding and power cables connected
to the router are securely in place and that no moisture is accumulating near the router.
To review grounding and site wiring requirements for the router, see “T640 Chassis
Grounding Cable and Lug Specifications” on page 118 and “Site Electrical Wiring
Guidelines for Juniper Networks Devices” on page 538.
• Regularly inspect the air filters on each power supply for dust and debris, and replace
the side filter on AC power supplies or front filter element on AC and DC power supplies
every 6 months. To replace a power supply front air filter element, see “Replacing a
Copyright © 2017, Juniper Networks, Inc.456
T640 Core Router Hardware Guide
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