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Bell System 21A
AT&T Bell System 21A Manuals
Manuals and User Guides for AT&T Bell System 21A. We have
1
AT&T Bell System 21A manual available for free PDF download: Test Instructions
AT&T Bell System 21A Test Instructions (26 pages)
TESTBOARD
Brand:
AT&T
| Category:
Test Equipment
| Size: 1 MB
Table of Contents
Table of Contents
1
Trunks
5
Operational Tests on Concentrator Trunks
10
Sensitivity and Response Measurements
17
Signaling and Alarm Functions
17
Signaling Tests on E and M Leads
17
Retirement of a Permanent Signal
18
Auxiliary Test Equipment
23
Coded Test Lines
23
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