Alcatel 7750 SR-12, Руководство по установке

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Installing DC PEMs
Page 66
7750 SR-12
Notes:
• The remote power source (circuit breaker panel, outlet, etc.) must be easily accessible.
• Each DC-input PEM requires a dedicated 100A (maximum) service.
• Cables are not provided. In the United States, use #6 AWG, high strand count copper wire. If the
7750 router is located outside the USA, consult local and national electrical code for proper wire
sizing.
• For the DC PEM terminal block, lugs are provided. If they are missing or misplaced, use a
Panduit LCC F6-14A copper, standard barrel, 2-hole lug with two 1/4-inch (.635 cm) diameter
holes on a 3/4-inch (1.905 cm) spacing (0.250-20 UNC).
• Two PEM slots are located at the bottom rear of the chassis (see 7750 SR-12 Chassis Rear View
on page 17 ). The slots are not labelled but for documentation purposes the top slot is referred to as
slot “1” and the bottom slot is referred to as slot “2”. For full redundancy two PEMs must be
installed and each PEM must be attached to an independent power source with a dedicated circuit
breaker. One -48 DC,100A (maximum) branch circuit is required for each PEM.
• The 7750 SR-12 requires a minimum of one DC power entry module (PEM) to operate, but two
are recommended for redundancy. When two PEMs are installed, they share the electrical load
equally as long as both PEMs are operational. If one PEM fails, the remaining PEM provides the
power the router requires for normal operation.
• For full redundancy, each power supply module should be attached to an independent power
source with a dedicated circuit breaker.