Руководство По Установке для Cisco Cisco Packet Data Gateway (PDG)
Power Cabling
▀ Power Cable Requirements
▄ ASR 5500 Installation Guide
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Power Cable Requirements
Sizing Power Cables
The following guidelines should be adhered to when sizing cable gauges for connecting the PFUs to a rack-mounted
power distribution panel.
power distribution panel.
Each conductor between the PDF and PDP should be calculated assuming a 0.3 volt drop from the PDF to the
panel.
Each cable between the PDP and ASR 5500 PFUs should be calculated a 0.3 volt drop from the panel to the
chassis. This is a total voltage drop of 0.6 volts.
Use high-flex, multiple-strand cable (minimum 4 AWG) between the power distribution panel and the chassis.
Important:
Even if the ASR 5500 chassis will not be completely filled with cards, size the cables for maximum
power draw according to the above recommendations. This practice facilitates future expansion as more cards are added
and the power supply is appropriately incremented.
and the power supply is appropriately incremented.
Terminating Power Cables
Each cable should be terminated with a 90 degree, 2-hole lug (supplied). Each feed consists of a supply (-48VDC) and
return (RTN) cable. The feed cables terminate at the rear of each PFU on 0.25-inch posts spaced 0.63-inch on center.
return (RTN) cable. The feed cables terminate at the rear of each PFU on 0.25-inch posts spaced 0.63-inch on center.
Cable Routing
All feed cables must be routed through the openings at the upper rear sides of the chassis.
Method of Connection
The method of connection at each PFU terminal is: flat washer, lug, lock washer and nut (7/16-inch). The nut(s) must be
torqued to 50 in-lb. (5.65 N-m).
torqued to 50 in-lb. (5.65 N-m).
Insulate Lugs
Use heat shrink tubing or non-conductive tape to insulate much of the exposed metal on the lug without interfering with
the attachment point.
the attachment point.
Crimp Lugs on Cables
Use the Panduit® lugs supplied with the chassis (LCD4-14AF-L). The lug must be crimped to the end of a ground cable
using Panduit crimp tool part number CT-720-1 (die color: gray, P29). The wire strip length is 7/8-inch (22 mm),
using Panduit crimp tool part number CT-720-1 (die color: gray, P29). The wire strip length is 7/8-inch (22 mm),
Follow the OEM recommendations for preparing and crimping the lugs on the ends of each feed cable.