In force components |
Number
|
Title |
Status |
Q.921 (09/97) |
ISDN user-network interface - Data link layer specification
This Recommendation is published with the double number Q.921 and I.441
|
In force
|
Q.921 (1997) Amendment 1 (06/00) |
|
In force
|
|
Superseded and Withdrawn components |
Number
|
Title |
Status |
Q.921/I.441 (11/88) |
ISDN user-network interface - Data link layer specification
This Recommendation is also included but not published in I series under alias number I.441
|
Superseded
|
Q.921 (03/93) |
ISDN user-network interface - Data link layer specification
|
Superseded
|