NON-DIRECTOR EXCHANGES OF BIRMINGHAM
CIRCA 1970 (presented for historical interest only)
Main exchanges
| Name | Description | Remarks |
| Anchor | Trunk non-director | Trunk exchange with no local director unit. Located underground in deep tunnels below Newhall Street. |
| Cinema | Central Tandem | Level 1 off other tandems. |
| Colmore Lodge | Register translators | Level 1 goes to ND codes serving director exchanges. Located in Telephone House, Newhall Street. |
| Newhall | Trunk non-director plus register translators | Level 1 off R/T goes to ND. Levels 6, 7 and 8 go to ND codes serving director exchanges. Located in Newhall Street. |
| Midland Tandem | Non-director | Incoming terminal exchange serving nearby toll-area exchanges. ND codes to director exchanges. |
| 'Toll' | Non-director | Serves toll-area ND and director exchanges. |
Other tandems
| Name | Description |
| Selly Oak | Level 3 off other tandems. |
| Sheldon | Level 4 off other tandems. |
| Tipton | Level 7 off other tandems. |
| Note | All tandems have codes to director exchanges and toll-area ND exchanges. |
ND ... non-director
R/T ... register translators
Toll area included exchanges outside the Birmingham director area, within a (probably) 50-mile radius.