| Section
| Date
| Issue
| Size
| Title
|
| 851-201-101 | 1978-08-01 | 3 | 2.54 MB | Protective Relaying Channel - Transmission Specifications and Considerations |
| 851-201-101 X1 | 1978-08-01 | 3 | 333.57 KB | Computational Examples - Multiple Frequency Signal - Enhanced Trip Signals |
| 851-330-122 | 1981-09-01 | 2 | 1.76 MB | Centrex Service FX Trunks and Remote WATS Trunks - Transmission Design Objectives - Switched Special Services Systems Engineering |
| 851-400-104 | 1981-10-01 | 2 | 100.12 KB | Multiport Conference Bridge Circuit with Switched-Gain Amplifiers (SD-5G099-01) - Transmission Design - Special Services Systems Engineering |