Cisco 2520-RF - 2520 Router Spécifications télécharger pdf (Page 28)

2-12 Cisco Multiport Router Hardware Installation and Configuration Guide

Preparing to Connect to a Network

EIA/TIA-232 Connections

The EIA/TIA-232 standard supports unbalanced circuits at signal speeds up to 64 kbps.

The serial port (labeled “SERIAL”) supports synchronous connections. The console and

auxiliary ports also use an EIA/TIA-232 connection; however, the console and auxiliary

ports support asynchronous connections.

The network end of the EIA/TIA-232 serial transition cable (not included) provides a

DB-25 connector, as shown in Figure 2-2. The end that connects to the serial port on the

rear panel of the router has a DB-60 connector.

EIA/TIA-232 serial transition cables are available with a DB-25 connected in either DTE

or DCE mode. To order a cable, see the section “Obtaining Service and Support” in the

“Overview of the Router” chapter.

Figure 2-2 EIA/TIA-232 Serial Transition Cable Connectors, Network End

EIA/TIA-449 Connections

The EIA/TIA-449 standard, which supports balanced and unbalanced transmissions, is a

faster (up to 2 Mbps) version of the EIA/TIA-232 standard that provides more functions

and supports transmissions over greater distances.

The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard, but it was

not widely adopted primarily because of the large installed base of DB-25 hardware and

because of the larger size of the 37-pin EIA/TIA-449 connectors, which limited the number

of connections possible (fewer than possible with the smaller, 25-pin EIA/TIA-232

connector).

H1343a

DTE

DCE

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Cisco 2520-RF - 2520 Router Spécifications Page 28