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WIRE
OR
LEAD
Ringer
Line Switch
426A Tube
(501P Set)
Mtg Cord
Conn Block
End
Inside
Wire
Ring
Conn
Tip
Block
GRD
Trnsf Leads
at Conn Block
•
To silence ringer permanently for these classes of service, connect BK ringer lead to K terminal on network.
t
To silence ringer permanently for negative and positive parties, connect yellow strip to terminal 6 instead of termi
nal 5 on terminal strip .
Note:
•
Refer to section on inductive noise for connections using 4-element ( 425A) tube
BSP 502-501-115-i02_1971-05-15.jp g
Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:53:52
LINE, RINGER, AND TUBE CONNECTIONS FOR SOOP AND 501 P TELEPHONE SETS
RING
BRIDGED
COLOR
PARTY
.
.
R
L2
L2
s
BK
Ll
G
K
K
A
A
S-R
s
L2
L2
R
BK
y
R
R
R
G
G
G
y
y
y
BK
B
B
R
R
R
G
G
G
y
y
y
y
y
B
B
TABLE E
TIP PARTY IDENT GROUND
TIP
PARTY
NORMAL
RINGER REV.
NO
CONNEC-
WHEN CONN
I DENT
liONS
TO L.L. EQUIP
GRO*
100011
26 5011
100011
26 5011
L2
B
B
K
G
B
B
G
K
B
K
G
A
B
G
K
L?
A
A
A
G
G
G
G
G
R
R
R
R
y
y
y
y
B
B
B
B
R
R
R
R
G
G
G
G
G
y
y
y
y
y
y
y
y
y
y
B
B
B
B
ISS 2, SECTION 502-501-115
NEG(-) PARTIESt
TO SILENCE
RINGER
RING
PERMA-
•
NENTLY
100011
26 5011
1 AND 5
2 AND6
G
K
B
G
K
G
K
G
A
B
B
K
B
K
K
G
A
L2
L2
L2
LlorG
Ll orG
K
L2
G
R
G
R
R
R
G
y
y
y
y
B
B
B
B
R
R
R
R
G
G
G
y
y
y
y
y
y
B
B
B
B
.•
POS!+l PARTIESt
TIP
RING
TIP
3
7
8
AND
4AND
L2
G
L2
L2
G
L2
A
A
A
K
K
K
L2
L2
L2
L2
L2
K
K
K
L2
G
G
R
G
G
R
G
R
y
y
y
B
B
B
R
R
R
G
G
G
y
y
y
y
y
y
B
B
B
u
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