Isdn Bri Connections; Csu/Dsu Connections - Cisco 1841 - 3G Bundle Router Hardware Installation Manual

Chapter 5 Cable Information and Specifications for Cisco 1800 Series Routers (Modular)

ISDN BRI Connections

The BRI WICs provide ISDN and BRI connections. BRI WICs are available with either an S/T interface
that requires an external Network Termination 1 (NT1), or a U interface that has a built-in NT1. You can
install the BRI WICs in any available WIC slots in the chassis.
Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact.
Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or
connection hardware. Any hardwired connection (other than by a nonremovable,
connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers.
Statement 23
Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF
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 WIC directly to an ISDN.
specifications for ISDN BRI cables. For information about pinouts, see
Cable
Table 5-3
Specification
Resistance (at 96 kHz)
Capacitance (at 1 kHz)
Impedance (at 96 kHz)
Wire diameter
Distance limitation
1. nF = nanofarad.
For more information on BRI WICs, see

CSU/DSU Connections

CSU/DSU WICs are available that provide switched 56-kbps connections, or full or fractionalized T1
connections.
For more information on CSU/DSU WICs, see
OL-5876-03
Specifications.
ISDN BRI Cable Specifications
High-Capacitance Cable
160 ohms/km
120 nF
75 ohms
0.024 in. (0.6 mm)
32.8 ft (10 m)
Low-Capacitance Cable
160 ohms/km
1
/km 30 nF/km
150 ohms
0.024 in. (0.6 mm)
32.8 ft (10 m)
Installing Cisco Interface Cards in Cisco Access
Installing Cisco Interface Cards in Cisco Access
Cisco 1800 Series Routers (Modular) Hardware Installation Guide
Preparing to Connect to a Network
Table 5-3 lists the
Cisco Modular Access Router
Routers.
Routers.
5-5