| In force components | 
| Number 
 | Title | Status | 
| G.957 (03/06) 
 | Optical interfaces for equipments and systems relating to the synchronous digital hierarchy | In force 
 | 
| 
 | 
| Superseded and Withdrawn components | 
| Number 
 | Title | Status | 
| G.957 (12/90) 
 | Optical interfaces for equipments and systems relating to the synchronous digital hierarchy | Superseded 
 | 
| G.957 (03/93) 
 | Optical interfaces for equipments and systems relating to the synchronous digital hierarchy | Superseded 
 | 
| G.957 (07/95) 
 | Optical interfaces for equipments and systems relating to the synchronous digital hierarchy | Superseded 
 | 
| G.957 (07/99) 
 | Optical interfaces for equipments and systems relating to the synchronous digital hierarchy | Superseded 
 | 
| G.957 (1999) Amendment 1 (12/03) 
 | 
 | Superseded 
 | 
| G.957 (1999) Amendment 2 (01/05) 
 | 
 | Superseded 
 |