Asynchronous/Synchronous Serial Module Baud Rates; Isdn Bri Connections - Cisco Router 3600 Hardware Installation Manual

Chapter 2 Preparing to Install the Router
Table 2-3
Rate (bps)
2400
4800
9600
19200
38400
56000
1544000 (T1)
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
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:
•
•

ISDN BRI Connections

The BRI WAN interface cards provide Integrated Services Digital Network (ISDN) Basic Rate Interface
(BRI) connections. The BRI modules and BRI WAN interface cards are available with either an S/T
interface that requires an external Network Terminator 1 (NT1), or a U interface that has a built-in NT1.
You can install the BRI modules in any available slot in the chassis.
Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF
Warning
or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables,
detach the end away from the unit first. Statement 1026
Use a BRI cable (not included) to connect the BRI WAN interface card directly to an ISDN.
lists the specifications for ISDN BRI cables. Also, refer to the
Specifications online document for pinouts. This document is located on Cisco.com and the
Documentation CD-ROM.
OL-2056-05
Serial Signal Transmission Speeds and Distances
EIA/TIA-232
Distance
Feet Meters
200 60
100 30
50 15
25 7.6
12 3.7
8.6 2.6
— —
Asynchronous interface—Maximum baud rate is 115.2 kbps.
Synchronous interface—Maximum baud rate is 128-kbps full duplex.
EIA/TIA-449, X.21, V.35,
EIA-530 Distance
Feet Meters
4100 1250
2050 625
1025 312
513 156
256 78
102 31
50 15
Table 2-3
Cisco Modular Access Router Cable
Cisco 3600 Series Routers Hardware Installation Guide
Preparing to Connect to a Network
are also valid for V.35, X.21, and
Table 2-4
2-13