Csu/Dsu Connections - Cisco 1900 series Hardware Installation

Preparing to Connect to a Network
The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact.
Warning
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
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 WIC directly to an ISDN.
specifications for ISDN BRI cables. For information about pinouts, refer to the
Router Cable Specifications
Table 3-3
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, refer to Cisco.com.

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, refer to Cisco.com.
Cisco 1900 Series Hardware Installation
3-6
Chapter 3
online document, which is located on Cisco.com.
ISDN BRI Cable Specifications
High-Capacitance Cable
160 ohms/km
1
120 nF /km
75 ohms
0.024 in (0.6 mm)
32.8 ft (10 m)
Cable Information and Specifications for Cisco 1900 Series Routers
Low-Capacitance Cable
160 ohms/km
30 nF/km
150 ohms
0.024 in (0.6 mm)
32.8 ft (10 m)
Table 3-3 lists the
Cisco Modular Access
OL-19084-01