This is a list of some of the Bell System Practices. At present it is just Division 233, the Number 3 Electronic Switching System.
This page was partially generated from a delimited text file. If you have other Practices, please put them in this format and mail to me!
Abbrevations:
- 3ESS
- No. 3 Electronic Switching System (
ESS
is a trademark of AT&T) - CS
- Common Systems
- DTO
- Description and Theory of Operation
- SSD
- Software Subsystem Description
Have these
in the Museum's collection
| Document | Title |
|---|---|
| 233-120-100 | Switching Network DTO, 3ESS |
| 233-121-100 | Scanner DTO, 3ESS |
| 233-121-105 | Peripheral Pulse Distributer and Peripheral Decoder DTO, 3ESS |
| 233-121-110 | Frame I/O Controller DTO, 3ESS |
| 233-121-115 | Trunk, Line, and Service Circuits Description, 3ESS |
| 233-121-116 | Test Circuits Description, 3ESS |
| 233-121-120 | Low Profile Combined Distributing Frame Description, 3ESS |
| 233-121-125 | Spare Equipment Storage and Handling Procedures, 3ESS |
| 233-122-110 | Dial Tone Delay Alarm Operation, 3ESS |
| 233-130-110 | Power Equipment Description, 3ESS |
| 233-135-100 | Test Equipment Description, 3ESS |
| 233-135-105 | Trunk and Line Test Panel and Associated Equipment DTO, 3ESS |
| 233-135-110 | ROTL (Remote Office Test Line) DTO, 3ESS |
| 233-140-100 | Office Maintenance Description, 3ESS |
| 233-141-100 | Centralized Office Maintenance DTO, 3ESS |
| 233-151-105 | Call Processing SSD, 3ESS |
| 233-151-110 | Call Trace SSD, 3ESS |
| 233-151-111 | Call Trace (3E3) SSD, 3ESS |
| 233-151-115 | Operator Functions SSD, 3ESS |
| 233-151-120 | Call Charging SSD, 3ESS |
| 233-151-125 | Input Processing and Scanning SSD, 3ESS |
| 233-151-130 | Basic Call Processing SSD, 3ESS |
| 233-151-135 | Custom Calling SSD, 3ESS |
| 233-151-136 | Custom Calling (Generic 3E3) SSD, 3ESS |
| 233-151-140 | Network Path Hunt SSD, 3ESS |
| 233-151-145 | Digit Processing SSD, 3ESS |
| 233-151-150 | Translations SSD, 3ESS |
| 233-151-160 | 911 Emergency Service Bureau SSD, 3ESS |
| 254-300-190 | Teletypewriter and Teletypewriter Controller DTO, CS |
Want to read these
| Document | Title |
|---|---|
| 254-340-088 | Processor Diagnostics SSD, 3A Processor Extended Operating System |
Seem to be missing
from the Museum's collection
| Document | Title |
|---|---|
| 233-151-155 | Peripheral Control SSD, 3ESS |