Programming instructions

191
Troubleshooting
Embedded T1/E1 (PRI, T1/D4, or MSDN/DPNSS)
Table 16: Embedded PRI Troubleshooting
Symptoms
Probable
Cause
Corrective Action
Embedded PRI
calls fail and all
Status LEDs on
the Dual T1/E1
Framer are dark
Configuration Verify that embedded PRI is programmed
properly in the following forms (see also
Program Embedded PRI/Q.SIG in the
Online Help):
• Controller Module Configuration
• Dual T1/E1 Framer Configuration
• Link Descriptor Assignment
• Digital Link Assignment
After the Digital Link Assignment form is
completed, the T1/E1 Framer status LEDs
should come on. This takes about 15
seconds.
Embedded PRI
Links are “not
seizable”,
Status LEDs
show RED
alarm
Configuration or
Wiring
Ensure that the ISDN cable is plugged into
the correct RJ-45 port on the Dual T1/E1
MMC. Verify that the ISDN cable is
correctly wired.
Change the “Termination Mode” setting in
the Link Descriptor Assignment form -
either LT or NT. This change takes about
30 seconds to take effect.
Embedded PRI
links are “not
seizable”,
Status LEDs
show flashing
GREEN
Configuration Verify the “Network Side/QSIG Master”
setting in the Protocol Assignment form.
Check the “Inverted D-Channel” setting in
the Link Descriptor Assignment form -
normally it is set to “No”. Each of these
changes takes approximately 30 seconds.
Embedded
DPNSS links
are “not
seizable”, Green
LED is ON
Configuration Ensure that the “Address for Message
Control” field in the Link Descriptor
Assignment form is set appropriately (“A”
or “B” depending on the far end.
If the configuration is correct, wait for
about one minute until every circuit has
finished negotiation with the far end.
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