AT&T Bell System Plant Series Identification And Operation page 4

SECTION 594-011-100
DATA RELAYS
----CONTROL RELAYS------
Fig. 3 - Dat~ Set, Front View, Cover Removed
3. 05 Frequencies accepted by the data sets
are shown in Table C . Minimum re-
ceiving level for each frequency is · -39 dbm
for frequencies below 2050 cps and -49 dbm
for frequencies of 2050 cps and above.
3 . 06 Frequencies of 600, 1098, and 1950
cycles are termed REST frequencies
and are used for echo suppression.
3. 07 The answer-back oscillator responds
to signals from the business machine
and transmits tones to the distant station.
Frequencies of the tones are 101 7 and 1785
cps.
3. 08 A D3BT - 61 cord, 5-1/2 feet long,
equipped with a Cannon MC - 14E-8-3SN
plug on one end, is furnished for connection
between the TEL LINE jack on the data set
and the telephone line.
3. 09 A KS-14532, List 15 gray cord as-
sembly, 10 feet long, is provided for
connection to a 117-volt ac 3-wire recepta-
Page 4
TABLE C
DATA FREQUENCIES
Frequency
Relay
cps
Operated
697 KlA
770
K2A
852 K3A
941
K4A
1209
KlB
1336 K2B
1477 K3B
1633
K4B
2050 KlC
2150 K2C
2250
K3C
2350 K4C
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