Isdn Connections - Cisco CISCO2515-RF - 2515 Router User Manual

ISDN Connections

Use a BRI cable (not included) to connect the router directly to an ISDN. (See Table 2-1.)
Warning
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. (To see translated versions of this
warning, refer to the Regulatory Compliance and Safety Information document that
accompanied your router.)
Warning
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. (To see translated versions of this warning, refer to the
Regulatory Compliance and Safety Information document that accompanied your router.)
Table 2-1 lists the specifications for ISDN BRI cables. Refer to the section "ISDN BRI Port
and Cable Pinouts" in the appendix "Cable Specifications" for pinouts.
Table 2-1
Specification
Resistance (at 96 kHz)
Capacitance (at 1 kHz)
Impedance (96 kHz)
Wire diameter
Distance limitation
1. nF = nanoFarad.
Network hazardous voltages are present in the BRI cable. If you detach the BRI
The ISDN connection is regarded as a source of voltage that should be
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)
Preparing to Connect to a Network
Low-Capacitance Cable
160 ohms/km
30 nF/km
150 ohms
0.024 in. (0.6 mm)
32.8 ft (10 m)
Preparing to Install the Router 2-7