Cisco ASR 1004 Overview And Installation page 32

Connecting --48 VDC Input Power to Cisco ASR 1004 Router
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Shielded cables must be used to connect to the DB-25 alarm connector on both the AC and –48 VDC
Note
power supplies in order to comply with FCC/EN55022/CISPR22 Class A emissions requirements. See
the "How Cisco ASR1000-RP Alarm Monitoring Works" section on page 2-22
Before you begin, read these important notices:
• The color coding of the –48 VDC input power supply leads depends on the color coding of the –48 VDC
power source at your site. Typically, green or green/yellow is used for ground (GND), black is used for
–48 V on negative (–) terminal and red is used for RTN on the positive (+) terminal. Make certain the
lead color coding you choose for the –48 VDC input power supply matches lead color coding used at
the –48 VDC power source.
• For –48 VDC input power cables, select the appropriate wire gauge based on the National Electrical
Code (NEC) and local codes for 60-amp service at nominal –48 VDC input voltage (–48/–60 VDC).
Three pairs of cable leads, source DC (–) and source DC return (+), are required for each power
distribution unit (PDU). These cables are available from any commercial cable vendor. All input power
cables for the chassis should have the same wire gauge and cable lengths should match within 10 percent
of deviation.
Each DC input power cable is terminated at the PDU by a cable lug. The cable lugs must be dual-hole, and
have a 45-degree angle tongue. They must be able to fit over #10 power terminal stud.
–48 VDC input power cables must be connected to the PDU terminal studs in the proper positive (+) and
Note
negative (–) polarity. In some cases, the –48 VDC cable leads are labeled, which is a relatively safe
indication of the polarity. However, you must verify the polarity by measuring the voltage between the
–48 VDC cable leads. When making the measurement, the positive (+) lead and the negative (–) lead must
always match the (+) and (–) labels on the PDU.
• A ground cable is required for each –48 VDC PDU. We recommend that you use at least 6-AWG
multistrand copper wire. This wire is not available from Cisco Systems; it is available from any
commercial cable vendor.
The ground wire cable lug should be dual-hole (as shown in
Power Supply Grounding Wire and Stud, on page
(15.88-mm) centers. Recommended lug terminal wire size Panduit part number:
•
Cisco ASR 1000 Series Router Hardware Installation Guide
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–48 VDC power supply
LEDs
DB-25 alarm connector
–48 VDC power supply
fan
◦ LCD8-14A-L for 8AWG wire size
◦ LCD6-14A-L for 6AWG wire size
Cisco ASR 1004 Router Overview and Installation
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Figure 18: Cisco ASR 1004 Router –48 VDC
34) and able to fit over M6 terminal studs at 0.625-inch
–48 VDC power supply
On (|)/ Off (O)
–48 VDC power supply
handle
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