Advanced Diagnostics - ISDN MDL error codes
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The following table shows errors reported by the MDL-ERROR-INDICATION primitive to do with layer-2 establishment on the "D" channel.
MDL is the standard prefix for messages to do with communication between layer management and the data link layer.
In a Diva trace, these codes appear in messages 'MDL-ERROR(x)', where 'x' is one of the following error codes.
| Error Code |
Error Condition |
Action |
Error Type |
| A |
Supervisory (F=1) |
Error Log |
Receipt of unsolicited response |
| B |
DM (F=1) |
Error Log |
Receipt of unsolicited response |
| C |
UA (F=1) |
TEI removal procedure or
TEI check procedure, then if TEI:
free: remove TEI
single: no action
multiple: TEI removal procedure
|
Receipt of unsolicited response |
| D |
UA (F=0) |
TEI removal procedure or
TEI check procedure, then if TEI:
free: remove TEI
single: no action
multiple: TEI removal procedure
|
Receipt of unsolicited response |
| E |
DM (F=0) |
Error Log |
Receipt of unsolicited response |
| F |
SABME |
Error Log |
Peer initiated re-establish. |
| G |
SABME |
TEI check procedure, then if TEI:
free: remove TEI
single: no action
multiple: TEI removal procedure
|
Unsuccessful retransmission
(N200 times) |
| H |
DISC |
TEI check procedure, then if TEI:
free: remove TEI
single: no action
multiple: TEI removal procedure
|
Unsuccessful retransmission
(N200 times) |
| I |
Status Enquiry |
Error Log |
Unsuccessful retransmission
(N200 times) |
| J |
N(R) error |
Error Log |
Other |
| K |
Receipt of FRMR |
Error Log |
Other |
| L |
Receipt of frame with
undefined control field |
Error Log |
Other |
| M |
Receipt of I field
not permitted |
Error Log |
Other |
| N |
Receipt of frame
with wrong size |
Error Log |
Other |
| O |
N201 error |
Error Log |
Other |
Adapted from ETS 300 125.
First published: 01-Feb-2011
Last published: 14-Mar-2011
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