Bell System Practices Plant Series Identification, Installation, Operation, Connections, And Maintenance page 4

SECTION 529-226-113
TABLE A
MODULE AND KEY ARRANGEMENT
1ST MODULE
KEY
UNIT
599A KEY
1st Position
Control Keys
(Nonlocking)
2nd Position
3rd Position
Pickup Keys
•)
(Locking
4th Position
Line!
5th Position Pickup Key
(Lock ing)
6th Position Hold Key
•
Convertible to nonlocking by removing the P-10E837
screw detail from the key plunger.
t
Due to set wiring, this key cannot be used
pickup key, but may be connected for signaling.
:1: Convert to nonlocking to provide alarm buzzer cutoff
feature.
Note:. When any locking key is converted for use
nonlocking control or signal key, connect the associated
spade-tipped lead to the C or SG terrrJnal (respectively)
onTBVI.
TABLE B
MODIFICATION TO REDUCE DIALING TONES
IN 4-WIRE CONFIGURATION
WIRE OR
LEAD COLOR
Dial (W-BL)
(BK-BL)
FW Relay
(O-W)
Note: This modification provides for reduction
of dialing tones heard in handset receiver during
4-wire operation (equal
Page 4
2ND MODULE 3RD MODULE
KEY UNIT
KEY UNIT
598A KEY 598A KEY
Control Keys
(Nonlocking) Precedence
Signal
Keys
(Nonlocking)
Pickup
Keys
(Locking*)
• t)
(L oc kin g
• :1:
(Locking
as
a line
as
a
REMOVE CONNECT
FROM TO
R
TB1-5
Net.
R
TB1-18
Net.
TB1-5 TB1-18
to 2-wire signal level).
TABLE C
MODIFICATION TO PERMIT MULTIPLING STATIONS
WIRE OR LEAD
Mtg Cord
(Y-S)
(G-W Binder)
Strap (G-:3K)
(Y-G)
Key Plug I
(BR-BK)
(Add)
440A Diodes
This modifi c ation permits multipling a
Note:
line to more than one station.
TABLE D
RINGER CONNECTIONS
OPTION
(See Note)
With
Capacitor
Common
or Private
Without
Line Ringer
Capacitor
•
Insulated and stored
Set is factory-wired with capacitor in cir­
Note:
cuit. When power failure feature is not provided
ringer may be connected without capacitor for
common, private, or
signal unless otherwise specified.
CONNECT
REMOVE
TO
FROM
G
TBIII-T
Net.
G
TBVI-C
Net.
TBVI-Rl
TBI-A-H
TBVI-X
TBI-A-H
TBVI
�
TB
TBV1
Rl
IRI lSI I S-RI
IBKI
K
* •
TB2-1
Net.
A
• •
TB2-1
Net.
intercommunicating line