Cisco Cisco Packet Data Gateway (PDG) Installationsanleitung
Power Cabling
▀ Power Considerations
▄ ASR 5500 Installation Guide
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Power Considerations
Each chassis supports up to eight -48 VDC, 80-amp power feeds, four per PFU. Each feed consists of a supply and
return cable.
return cable.
Important:
The power source must be a UL/CSA listed device with a regulated output no greater than -60VDC.
Typically, the DC power feeds are fed from a power distribution frame (PDF) to a power distribution panel (PDP) at the
rack.
rack.
Important:
The DC power Battery Return (BR) or positive terminal, must be grounded at the source end (power
feed or mains power end).
Important:
Minimum 4 AWG multiple strand, high-flex cable is recommended for final connections from the
PDP to the PFUs. Although the chassis configuration may not draw maximum power, it should be sized and wired to
handle 12.8 kW of power to accommodate future expansion. See
handle 12.8 kW of power to accommodate future expansion. See
Each feed connects to supply and return terminals on the rear of the PFUs using two-hole lugs crimped to the end of
each cable. The feed cables are routed through openings in each side of the chassis. The input terminals are wired
through EMI filters to the ASR 5500 backplane.
each cable. The feed cables are routed through openings in each side of the chassis. The input terminals are wired
through EMI filters to the ASR 5500 backplane.
For a non-redundant chassis power configuration, live power feeds must be connected to all four power inputs on PFU-
A. For a redundant power configuration, live power feeds must be connected to all four power inputs on PFU-B. The
four power feeds per PFU assure that all power planes in the backplane are energized; power is available to all card slots
in the chassis. For additional information, see
A. For a redundant power configuration, live power feeds must be connected to all four power inputs on PFU-B. The
four power feeds per PFU assure that all power planes in the backplane are energized; power is available to all card slots
in the chassis. For additional information, see
The circuit breakers at the power distribution panel must disconnect the supply line of each -48VDC feed. However, it is
recommended that the circuit breakers at the power distribution panel simultaneously disconnect both poles (supply and
return) for each -48 VDC feed to completely isolate the ASR 5500 from the power source.
recommended that the circuit breakers at the power distribution panel simultaneously disconnect both poles (supply and
return) for each -48 VDC feed to completely isolate the ASR 5500 from the power source.
To maintain power redundancy, separate –48 VDC supply circuits should be used to feed each DC power input on both
PFUs.
PFUs.
Caution:
Set the circuit breakers on the distribution panel to the OFF position before making the power
connections at the PFUs.
Each power input cable must be terminated with a supplied Panduit LCD4-14AF-L 2-hole, 90-degree lug using the
appropriate crimping tool and die.
appropriate crimping tool and die.
The following alternate lug types (not supplied with the chassis) are also approved for use on the power feeds:
Panduit LCC4-14AF-L, 4 AWG, 2-hole, 90-degree long barrel lug
Burndy YAZ2C2TC1490, 2 AWG, 2-hole, 90-degree long barrel lug
If a DC power input should fail, the operating supply circuits continue to power the ASR 5500.