Power Guidelines, Requirements, And Specifications; Site Electrical Wiring Guidelines; Chassis Grounding Specifications - Juniper BX7000 Hardware Manual

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Power Guidelines, Requirements, and Specifications

Site Electrical Wiring Guidelines

Chassis Grounding Specifications

76 Power Guidelines, Requirements, and Specifications
Advanced Clocking Module
Ports
LED
Cable and connector
Operating environment
Power consumption
TCXO Clock card
OCXO Clock Card
Site Electrical Wiring Guidelines on page 76
Chassis Grounding Specifications on page 76
AC Power Specifications on page 77
AC Power Cord Specifications on page 77
DC Power Specifications on page 78
DC Power Cable Specifications on page 78
When planning the electrical wiring at your site, consider the factors discussed in the following
sections:
Distance Limitations for Signaling
Improperly installed wires can emit radio interference. In addition, the potential for damage from
lightning strikes increases if wires exceed recommended distances or if wires pass between
buildings. The electromagnetic pulse (EMP) caused by lightning can damage unshielded
conductors and destroy electronic devices. If your site has previously experienced such problems,
you might want to consult experts in electrical surge suppression and shielding.
Radio Frequency Interference
You can reduce or eliminate the emission of radio frequency interference (RFI) from your site wiring
by using twisted-pair cable with a good distribution of grounding conductors. If you must exceed
the recommended distances, use a high-quality twisted-pair cable with one ground conductor for
each data signal when applicable.
Electromagnetic Compatibility
If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from
lightning or radio transmitters, you might want to seek expert advice. Strong sources of
electromagnetic interference (EMI) can destroy the signal drivers and receivers in the gateway and
conduct power surges over the lines into the equipment, resulting in an electrical hazard. It is
particularly important to provide a properly grounded and shielded environment and to use
electrical surge-suppression devices.
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper
operation, the gateway must be adequately grounded before power is connected. For grounding
the gateway, use a 14-AWG to 10-AWG wire whose length depends on the location where the
gateway will be mounted. Two grounding studs are provided on the right side of the front panel for
connecting the gateway to earth ground. One grounding screw is provided on the left side in the
rear of the gateway for connecting the gateway to the earth ground when it is mounted on the wall.
Description
2 BNC connectors, 1 RJ-45 connector
LED indicates the synchronization state of the clock
BNC co-axial cable with BNC connector and interface
cable
Storage temperature: –40°C to 70°C
Operating temperature: –40°C to 70°C
Humidity: 95% max.
6.82 W
10.2 W during start up
7.89 W ambient @ 25°C
Copyright © 2010, Juniper Networks, Inc.