| Section | Date | Issue | Size | Title |
| 553-201-201 | 1977-07-01 | 3 | 1.72 MB | "TOUCH-TONE" Calling Equipment - Identification, Installation, and Connections - 801A PBX |
| 553-201-202 | 1974-09-01 | 2 | 5.79 MB | Auxiliary Equipment - Identification, Installation, and Connections - 801A PBX |
| 553-201-205 | 1979-06-01 | 4 | 7.83 MB | 801A PBX - System Growth and Rearrangement |
| 553-201-300 | 1974-04-01 | 2 | 4.25 MB | Attendant and Station Equipment - Method of Operation - 801A PBX |