Cisco 2600 Series Hardware Installation Guide

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Cisco 2600 Series Routers Hardware Installation Guide
OL-2171-02
Chapter 2 Preparing to Install the Router
Preparing to Connect to a Network
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232 signals. The
recommended distance limits for EIA/TIA-449 shown in Table 2-3 are also valid for V.35, X.21, and
EIA-530. Typically, EIA/TIA-449 and EIA-530 can support 2-Mbps rates, and V.35 can support 4-Mbps
rates.
Asynchronous/Synchronous Serial Module Baud Rates
The following baud-rate limitations apply to the slow-speed serial interfaces found in the
asynchronous/synchronous serial modules:
• Asynchronous interface—Maximum baud rate is 115.2 kbps.
• Synchronous interface—Maximum baud rate is 128-kbps full duplex.
EIA/TIA-232 Connections
EIA/TIA-232 supports unbalanced circuits at signal speeds up to 64 kbps. The network end of the
adapter cable is a standard 25-pin D-shell connector known as a DB-25. (See Figure 2-1.) The router
console and auxiliary ports also use EIA/TIA-232 connections; however, the serial module ports support
synchronous connections, and the console and auxiliary ports support asynchronous connections.
Figure 2-1 EIA/TIA-232 Adapter Cable Connectors, Network End
EIA/TIA-449 Connections
EIA/TIA-449, which supports balanced (EIA/TIA-422) and unbalanced (EIA/TIA-423) transmissions,
is a faster version of EIA/TIA-232 (up to 2 Mbps) that provides more functions and supports
transmissions over greater distances.
Table 2-3 Serial Signal Transmission Speeds and Distances
EIA/TIA-232
Distance
EIA/TIA-449, X.21, V.35,
EIA-530 Distance
Rate (bps) Feet Meters Feet Meters
2400 200 60 4100 1250
4800 100 30 2050 625
9600 50 15 1025 312
19200 25 7.6 513 156
38400 12 3.7 256 78
56000 8.6 2.6 102 31
1544000 (T1) — — 50 15
H1343a
DTE
DCE

Cisco 2600 Series Specifications

General

Brand	Cisco
Model	2600 Series
Category	Network Router
Language	English