HP J3138A, Installation Manual

Page: 19 / 104

2-3
Installing the HP AdvanceStack Internet Router
Preparing to Connect to a Network
In
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ISDN Connections
Use a BRI cable to connect the router directly to an ISDN. (See table 2-1.)
W A R N I N G
Network hazardous voltages are present in the BRI cable. If you detach the
BRI cable, detach the end away from the router to avoid possible electric
shock. Network hazardous voltages are also present on the system card in the
area of the BRI port (RJ-45 connector), regardless of when power is turned
OFF.
W A R N I N G
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 nonremovable, connect-one-time-only
lug) must be made only by PTO staff or suitably trained engineers.
Table 2-1 lists the specifications for ISDN BRI Cables. Refer to the section
“ISDN BRI Port and Cable Pinouts” in appendix A “Cable Specifications” for
pinouts.
Table 2-1. ISDN BRI Cable Specifications (S/T Cable)
Specification High-Capacitance Cable Low-Capacitance Cable
Resistance (at 96kHz) 160 ohms/km 160 ohms/km
Capacitance (at 1 kHz) 120 nanoFarads/km 30 nanoFarads/km
Impedance (96 kHz) 75 ohms 150 ohms
Wire diameter 0.024 inch (0.6 mm) 0.024 inch (0.6 mm)
Distance limitation 32.8 feet (10 m) 32.8 feet (10 m)