RCA 70/700 Series Reference Manual page 66

Feature
5617-1
TELEX OPeration
Reference Information
• This feature enables the CCM to operate with Western Union TELEX,
through the 70/710 Telegraph Buffer. TELEX is a switched network ser-
vice operating at 6.6 characters per second. This feature provides an
alternate oscillator which generates the 50-bit-per-second modulation rate
necessary for TELEX. The oscillator set provided with this feature can
be accommodated only in the location normally occupied by either set No.
2 or set No.3.
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