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536-070-001 i1 Mar79 - 507 PBX - Traffic Engineering

3 pages with cover sheet. 507A and 507B PBX Business Services Traffic Engineering Manual PBX Systems. Renumbered by adding a cover letter to a Traffic Business Services Facilities Engineering Practice (BSFEP) Division B Section 3 - September 1972, titled:
   Attendant Facilities 507A and 507B Switchboards (Rated MD).
Includes a brief product overview, including:
  General Description
  Capacities
  Feature and Circuit Definitions
  Operation
  Traffic Engineering Considerations
Page 4 of 4 is missing (probably contains the referenced figures).

Scanned and contributed by Russ Kirk. Contrast & clarity enhanced by Steph Kerman. OCR by Sam Etler.

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