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).
The network end of the EIA/TIA-449 serial transition cable (not included) provides a DB-37 connector,
as shown in Figure 2-3. The end that connects to the serial port on the rear panel of the router has a
DB-60 connector.
EIA/TIA-449 serial transition cables are available with a DB-37 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 2-3: EIA/TIA-449 Serial Transition Cable Connectors, Network End
V.35 Connections
The V.35 standard is recommended for speeds up to 48 kbps, although in practice it is used successfully
at 4 Mbps.
The network end of the V.35 serial transition cable (not included) provides a standard 34-pin
Winchester-type connector, as shown in Figure 2-4. The end that connects to the serial port on the rear
panel of the router has a DB-60 connector. V.35 cables are available with a standard V.35 plug or
receptacle in either DTE or DCE mode. To order a cable, see the section "Obtaining Service and
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2500/2520/2520_23/c2520pre.htm (9 of 13) [10/27/2000 3:07:41 PM]
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