Bell System Practices Plant 33 ASR Manual page 15

(
(
(
(
(
LOOP
IMPEDANCE
1255
900
850
750
575
500
410
220
TABLE C
DATA SET 108A-TYPE
HYBRID NETWORK STRAPPING
DATA SET !OBA-TYPE DATA SET !OBA-TYPE
SCREW SWITCH C CLOSED E-F CONNECTION
2-3 Cut
2-3 Strapped
1-2 Cut
3-4 Cut
1-2, 3-4 Cut
1-2
Strapped
3-4
Strapped
1-2, 3~4 Strapped
4.05
Connect TTY power cord to the customer-
provided ac receptacle.
4.06
Adjust Rll potentiometer on data set for
output level specified on service order
and/or circuit layout record card.
Note: If no output level is measured, op-
erate carrier squelch (CS) switch on DAS
820Bl or 820B2 to OFF. Restore CS switch
after adjustment of Rll and remove TTS-28.
4.07
Connect the incoming data line to the tip
(T) and ring (R) terminals on TS A lo-
cated on DAS 820Bl or 820B2.
4.08
Perform installation tests in accordance
with the section entitled No. 1 Electronic
Switching System ADF, Half-Duplex -100
Word Per Minute Data Station Using 4-Row
Teletypewriters, Test Procedures (580-301-500).
5. PREOPERATIVE ADJUSTMENTS AND TESTS-
DAT A SET 109A-TYPE
5.01
There are no preoperative adjustments
and tests required for Data Set 109A-
type (Fig. 8).
ISS 1, SECTION 580-301-200
5.02
Verify that Data Set 109A-type is seated
firmly in its connector .
5.03
Connect the incoming data line to the tip
(T) and ring (R) terminals on TS A lo-
cated on DAS 820Bl or 820B2.
5.04
The data line must be connected
to
DAS
820B1 or 820B2 correctly (tip
to
T ter-
minal and ring
to
R terminal). The tip
has a positive potential from the STC.
Perform installation tests in accordance
with Section 580-301-500.
Fig. 8 - Data Set 109A-Type
Page 15
15 Pages