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Chapter 7 - Troubleshooting
Internal ISDN Terminal Adapter
Problem
Composite link down with CTS,
XMT and RD LEDs on
Composite link down with CD,
CTS, XMT, RCV and RD LEDs
on
Flashing RXT LED
Possible Causes
Terminal adapter not
communicating with ISDN line
Faulty communication line
Composite link not configured
correctly
High error rate on communication
line
ISDN clocking configured
incorrectly
Solution
1. Verify that the the TA LED is
on. If off, ensure that DIP-
Switch #2 is set to OPEN
(Up).
2. Verify that a cable is
connected to the internal
composite DSU/TA Digital
connector.
3. Verify ISDN configuration. See
Composite Link Settings -
Internal ISDN in Tabe 7-6.
4. Call Tech Support for
assistance (see Chapter 8).
1. Call phone company and
verify communication line.
2. Call Tech Support for
assistance (see Chapter 8).
1. Verify ISDN configuration, See
Composite Link Settings -
Internal ISDN in Table 7-6.
2. Call Tech Support for
assistance (see Chapter 8).
1. View composite link statistics
(refer to Table 7-9).
2. Perform composite link
loopback tests (see
Diagnostic Testing in Table 7-
12).
3. Call phone company and
verify communication line.
4. Call Tech Support for
assistance (see Chapter 8).
1. For ISDN line, both terminal
adapters should be set for
normal clock source.
2. Call Phone company and
verify communication line.
3. Call Tech Support for
assistance (see Chapter 8).