Bell System Practices 1634 Service Manual

BELL SYSTEM PRACTICES
Plant Series
SECTION 502-611-402
Issue 1, June 1970
AT&TCo Standard
SERVICE
1634- AND 1635-TYPE TELEPHONE SETS
1.
GENERAL
1.01
This section contains connection and maintenance
information for 18- and 30-button telephone
sets equipped with 10-button TOUCH-TONE; dials
and used with station line concentrators.
1.02 The 1634- and 1635-type telephone sets are
rated MD.
1.03
Connection information for these sets was
formerly contained in Section 502-634-411
~vhictl is hereby canceled.
2. CONNECTIONS
2.01 See
SD-69498-01 (key telephone systems,
6A, lA1, and 1A2, sbation line concentrator)
and appropriate sections in Division 518 for
connections to station line concentrator using 23,5B
or 236B key telephone units.
2.02
A 235J3 KTU is associated with each 1634-type
(MD) telephone set and a 236B KTU with
each 1635-type (MD) telephone set. Because of
the single common talking and control lead pattern
in these set% a line concentrator KTLT must be
associated with each telephone set installed and
cannot be shared, even on a bridged station basis.
2.03 Connections for the stiation busy lamp feature
are provided on the 235- or 236-type KTU.
Refer to the section on station line concentrators
in Division 518 for connection information.
2.04
A 599B or 657B key may be used ill the
first key position to provide ringer or line
cutoff (Fig. 2 and 3). When other uses are required,
they must be provided for by means of an auxiliary
relay separately mounted and controlled by the
turn key contacts since there are insufficient
mounting cord conductors to permit full switching
at the key.
2.05
Because of insufficient leads from the first
module plug for use with a 599H key, the
supplemental hold feature cannot be used in these
sets.
2.06 To convert a key position from pickup
(locking) to signaling (non] ocking) remove
the screw detail P-1 OE837 entirely from the plunger
at the key position to be converted. Make the
necessary wiring changes as shown in Table B.
When converting a k;y
P-11E977 insulating detiail
adjacent to key plunger.
for signaling, place a
over the 2 key contacts
TABLE A
P-90D197 POLARITY GUARD CONNECTIONS
I
LEAD
I
COLOR REMOVE FROM CONNECT TO
1
Line Switch
(w)
,
~
(G-WF$
c"
s-t
Dial
(BK)
RR* – T-t
Polarity
(w) c*
Guard
(G)
RR*
* Network terminal.
~ Polarity guard terminal.
125Y3 dial only.
Notes:
1.
2.
Polarity guards shall be installed only
when specified by local instructions for end-
to-end signaling when battery and ground
reversals may be encountered.
The polarity guard is located to the right
and rear of the TOUCH-TONE dial.
'C American Telephone and Telegraph Com]mny, 19'70
Printed in U.S.A. Page 1