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A DC-powered router that is equipped with a DC terminal block is intended only for
installation in a restricted access location. In the United States, a restricted access
area is one in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical
Code ANSI/NFPA 70.
NOTE:
Primary overcurrent protection is provided by the building circuit
breaker. This breaker should protect against excess currents, short circuits,
and earth faults in accordance with NEC ANSI/NFPA70.
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Ensure that the polarity of the DC input wiring is correct. Under certain conditions,
connections with reversed polarity might trip the primary circuit breaker or damage
the equipment.
•
For personal safety, connect the green and yellow wire to safety (earth) ground at both
the router and the supply side of the DC wiring.
•
The marked input voltage of –48 VDC for a DC-powered router is the nominal voltage
associated with the battery circuit, and any higher voltages are only to be associated
with float voltages for the charging function.
•
Because the router is a positive ground system, you must connect the positive lead to
the terminal labeled
RETURN
, the negative lead to the terminal labeled
–48V
, and the
earth ground to the chassis grounding points.
Related
Documentation
M120 DC Power Supply Description on page 31
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Installing an M120 DC Power Supply on page 180
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Replacing an M120 DC Power Supply on page 177
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Replacing an M120 DC Power Supply Cable on page 183
Agency Approvals and Compliance Statements for the M120 Router
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Agency Approvals for M120 Routers on page 219
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Compliance Statements for NEBS for the M120 Router on page 220
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Compliance Statements for EMC Requirements for the M120 Router (European
Community) on page 221
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Compliance Statements for EMC Requirements for M Series, MX Series, and T Series
Routers (United States) on page 222
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Compliance Statements for EMC Requirements for M Series, MX Series, and T Series
Routers (Japan) on page 222
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Compliance Statements for EMC Requirements for M Series, MX Series, and T Series
Routers (Canada) on page 223
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Compliance Statements for Environmental Requirements for M Series, MX Series, and
T Series Routers on page 223
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Compliance Statements for Acoustic Noise for the M120 Router on page 223
Copyright © 2010, Juniper Networks, Inc.
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M120 Multiservice Edge Router Hardware Guide
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