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| DATA | TERMINAL |
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| TN726 |
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| EQUIPMENT, |
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| DATA | LINE | CP |
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| HOST | COMPUTER |
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| Z3A1/2/4 |
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| ADU |
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| TN742 |
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| VOICE | TERMINAL |
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| ANALOG | LINE |
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| OR |
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| ZTN78 | TIP |
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| 7101A) |
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| DATA | TERMINAL |
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| TN726 |
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| EQUIPMENT, |
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| DATA | LINE | CP |
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| Z3A5 |
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| ADU |
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| MULTILINE |
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| ZTN79 |
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| VOICE | TERMINAL |
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| ATL LINE | CP |
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| ZTN76 |
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| DIVISION |
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| MULTIPLEX |
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| CO, FX, WATS |
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| TRUNK | CP |
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| BUS |
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| — — — — — |
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| O R |
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| PAGING |
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| ZTN77 |
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| EQUIPMENT |
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| LOOP | START |
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| TRUNK | CP |
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| TN753 |
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| DID | TRUNKS |
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| DID |
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| TRUNK | CP |
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| TN760B |
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| TIE | TRUNKS |
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| TIE |
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| TRUNK CP |
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| LEGEND | : |
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| A D U – | ASYNCHRONOUS DATA | UNIT |
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| CAS | – | CALL ACCOUNTING | SYSTEM |
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| CO | – | CENTRAL | OFFICE |
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| CP – | CIRCUIT | PACK |
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| DID - DIRECT | INWARD DIALING |
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| D T U– DIGITAL TAPE UNIT |
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| ||||||||
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| FX – | FOREIGN | EXCHANGE |
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| ||||
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| MET – MULTIBUTTON ELECTRONIC TELEPHONE |
|
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| ||||||||||||
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| O P S- |
|
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| |||||||||||
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| SAT – SYSTEM ADMINISTRATION TERMINAL |
|
|
|
|
|
| ||||||||||||
|
| S M D R– STATION MESSAGE DETAIL RECORDING |
|
|
|
|
|
| ||||||||||||
|
| WATS - WIDE AREA TELECOMMUNICATIONS SERVICE |
|
|
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