Advanced Diagnostics - ISDN MDL error codes
- Nathaniel Halbrooks
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 free: remove TEI | Receipt of unsolicited response |
D | UA (F=0) | TEI removal procedure or free: remove TEI | 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 | Unsuccessful retransmission |
H | DISC | TEI check procedure, then if TEI: free: remove TEI | Unsuccessful retransmission |
I | Status Enquiry | Error Log | Unsuccessful retransmission |
J | N(R) error | Error Log | Other |
K | Receipt of FRMR | Error Log | Other |
L | Receipt of frame with | Error Log | Other |
M | Receipt of I field | Error Log | Other |
N | Receipt of frame | Error Log | Other |
O | N201 error | Error Log | Other |
Adapted from ETS 300 125.