Technical data

G-4 Troubleshooting and Customer Support 90362-01
NetBlazer LS ISDN Troubleshooting
The D-channel light is off. Something is wrong with your ISDN connection. Either the cables are
not connected to the NT1, or the NT1 is not connected to an active
ISDN line. If you suspect that your ISDN line is not active, call your
Service Provider.
The D-channel light is
flashing.
There is a partial connection, but one of the cables may be loose, or
you’ve attached more than one NetBlazer to the same NT1. You
should only have one NetBlazer attached to each NT1. Also, make
sure that no other ISDN devices (such as ISDN monitoring devices) are
attached to the NetBlazer or the NT1; if any attached monitoring
devices are left in emulation mode it may cause connection problems.
The B-channel light is
flashing.
The NetBlazer is attempting to initiate or receive an ISDN connection.
The light should blink briefly, then stay on once the connection is
made. If the light continues to blink, the NetBlazer is unable to create
the connection. Check to make sure the phone number to the remote
NetBlazer is correct, and that the remote NetBlazer is up. Also, check
to see if the B-channels on the remote NetBlazer are all in use. The
B-channel lights may also flash if the SPIDs or DNs are incorrect (for
example, in some cases the DNs should not include an area code), or
if you’ve selected the wrong switch type.
You fixed one of the
above problems, but
ISDN still isn’t working.
Try turning the NetBlazer off for a few seconds and then rebooting; this
makes sure that the NetBlazer resets.