Interface cards descriptions
40
SmartNode 1000 and 2000 Series Getting Started Guide
1 • General Information
Operating modes
The four ports can be used in three different modes, which are tabulated in
table 14
.
•
An X in the NET column of the table means that the port performs network side signaling and that the pin
out corresponds to an ISDN NT. A NET port is connected to an ISDN terminal, i.e. a telephone or a PBX.
•
An X in the USR column means that the port performs user side signaling and the pin out corresponds to
an ISDN terminal. The two ports (2, 3) have configurable pin outs.
•
An X in the HW Bypass column refers to the fallback mode.
The possible BRI port configurations are listed in
table 14
.
Hardware bypass
BRI 1 and BRI 2 can be used to provide an emergency service. If a power failure occurs a relay connects these
two interfaces with each other.
•
BRI 1 must be connected with a telephone terminal or PBX if the bypass is active.
•
BRI 2 must be connected to the ISDN network if the bypass is active.
Table 14. BRI Port Configurations
Port
NET
USR
HW Bypass
BRI 0
X
BRI 1
X
X
BRI 2
X
X
X
BRI 3
X
X
