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ISDN PRI (E1/T1)
45
SmartNode 5570 User Manual
C
• Cabling
ISDN PRI (E1/T1)
The E1/T1 PRI port 0/1 is usually connected to a PBX or switch—local exchange (LE). Type and pin outs of
these devices vary depending on the manufacturer. In most cases, a straight-through RJ-45 to RJ-45 can be
used to connect the PRI port 0/1 with a PBX.
The E1/T1 PRI port 0/0 is usually connected to a PSTN NT. In most cases, a straight-through RJ-45 to RJ-45
can be used to connect.
Note
Note: Port 0/1 uses a different pin-out than port 0/0. This avoids the usage
of a PRI cross-over cable when connecting the PBX to port 0/1 and the
PSTN NT to port 0/0.
In case both ports have to be connected to a PBX, one port requires a PRI cross-over cable. The same applies
when connecting both ports to the PSTN.
The pin-out of a cross-over cable is illustrated in
CAUTION
Hazardous network voltages are present in the PRI cables. If
you detach the cable, detach the end away from the Smart-
Node or interface card first to avoid possible electric shock. Net-
work hazardous voltages may be present on the device in the
area of the PRI port, regardless of when power is turned OFF.
CAUTION
To prevent damage to the system, make certain you connect
the PRI cable to the PRI port only and not to any other RJ-45
socket.