Cisco UBR7246VXR 하드웨어 설치 - 페이지 6

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Power Connection Guidelines for DC-Powered Systems

The DC-input power supply allows the Cisco uBR7246VXR router to operate on either -48 or -60 VDC systems.

Warning

Connect the unit only to DC power source that complies with the safety extra-low voltage (SELV) requirements in

IEC 60950 based safety standards. Statement 1033

The Cisco uBR7246VXR router (using DC power supplies) is not shipped with wiring to connect to a DC power source. You

must provide input, return, and earthing (grounding) wiring at the site, and install and protect the wiring in accordance with

local and national wiring regulations.

Cabling Guidelines

When planning the location of a new system, keep in mind signal type, signal speed, and transmission medium, as well as

distance limitations for signaling, EMI, and connector compatibility. Use this information as a guideline in planning your

network connections prior to installing the Cisco uBR7246VXR router.

Ethernet and Fast Ethernet Connections

The maximum distances for Ethernet and Fast Ethernet network segments and connections depend on the type of transmission

cable being used. See Table 2 for the maximum transmission distances between stations.

Table 2

Ethernet and Fast Ethernet Maximum Transmission Distances

Transceiver Speed

Cable Type

10 Mbps

Category 3

10 Mbps

Multimode (MMF) Full duplex and half duplex

100 Mbps

Category 5

Category 5e

100 Mbps

Category 6

100 Mbps

MMF

100 Mbps

Singlemode (SMF)

For Ethernet 10BASE-T and 100BASE-TX cables guidelines and specifications, go to the following URL:

http://www.cisco.com/warp/public/63/ethbase.html

Coax Cable Connections

Keep in mind the following information when you are setting up and cabling your system.

• The length of the cable determines the amount of signal loss.

• Headend-grade cable (quad-shield 59-series minimum) is recommended.

• Do not bend the coaxial cable tighter than the cable manufacturer's specified minimum bend radius.

• Do not tighten cable connections (F connectors) more then 10 to 15 in-lbs (1.73 to 2.31 nm).

• To prevent connection problems, always use the same size coaxial cable. For example, going from a 6-series cable to a

59-series cable may cause reliability issues (intermittent contact) in the headend environment.

For more information about cables and cable specifications, go to the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/cable/cab_rout/cr72hig/cr72coax.htm

Transmission Mode

Full duplex and half duplex

Half

Full

Half

Full

Maximum Distance Between Stations

328 ft (100 m)

1.2 mi (2 km)

328 ft (100 m)

1312 ft (400 m)

1.2 mi (2 km)

1312 ft (400 m)

6.2 mi (10 km)