Preparing to Connect to a Network
Cisco 2600 Series Hardware Installation Guide
2-22
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 into any available slot in the chassis.
Use a BRI cable (not included) to connect the BRI WAN interface card directly to an ISDN.
Table 2-3 lists the specifications for ISDN BRI cables. Also, refer to the online document
Cisco Modular Access Router Cabling Specifications for pinouts. This document is located
on both the Documentation CD-ROM that accompanied your router package, and Cisco
Connection Online.
Warning
Network hazardous voltages are present in the BRI cable. If you detach the
BRI cable, detach the end away from the router first to avoid possible electric shock.
Network hazardous voltages also are present on the system card in the area of the BRI port
(RJ-45 connector), regardless of when power is turned OFF.
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.
