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Connecting Your 3000 Series Secure Gateway Router
16 3000 Series User Guide
Caution
You can also use an RJ-11 cable with a regular
analog telephone to connect the 3000 Series to the
ISDN wall jack.
N
x
Networks discourages using an RJ-11 cable for
this purpose, however, because you may
inadvertently plug the 3000 Series into a normal
telephone jack rather than into an ISDN wall jack.
This can damage the 3000 Series.
ISDN S/T Module
Notes:
• You can install this module only in slot 3 (D3).
• You must connect to the ISDN network via a line isolation unit (NT1
device).
The S/T module does not have a built-in NT1 device. You must provide an
external NT1 device. A typical NT1 device looks like a small modem and has
S/T port(s) and a U interface on the back of it.
The ISDN S/T module can co-exist with other ISDN equipment using the
same ISDN line.
To connect your ISDN S/T module,
1. Connect one end of the RJ-45 ISDN cable (not supplied with your router)
to the RJ-45 ISDN connector on the ISDN S/T module.
2. Connect the other end of the ISDN cable to the S/T port on the NT1
device.
3. Set the S/T terminator switch on the ISDN module to the appropriate
position. See Setting the S/T Switch on page 17.