Bell System 500A, Reference

Page: 5 / 16

ISS 3, SECTION 502-501-101
WIRE
OR
LEAD
Ringer
Leads
Line Switch
Lead
426A
Tube
( 3-element)
Mtg
Cord
in
Set
Mtg
Cord
at Conn
Block
Line
Ring
Wire
at Tip
Conn
Grd
Block
Notes:
TABLE C
500C/D AND 501C/D TELEPHONE SET LINE, RINGER, AND TUBE CONNECTIONS
(NOTE 3)
NEGATIVE (-)
TIP PARTY !DENT GROUND PARTIES
TIP
(NOTE 4)
INDIV
RING
PARTY
COLOR
OR NO
RINGER REV.
BRIDGED
PARTY
I DENT
NORMAL
WHEN CONN
GRD
CONNECTIONS
TO L.L. EQUIP. RING TIP
(NOTE 2) (1·5) (2-6)
10000 26500
10000
26500
R
L2 L2 L2 K B B G G G
BK G G G G B B K G G
s K K K B K
G
B A A
S-R A A A B G
K B K K
s L2 L2 L2 A A
A
A
L2
L2
R
Ll or G Ll or G
BK K K
y
L2 L2
R L2 L2 L2 L2 L2 L2
L2
L2 L2
G
Ll Ll Ll Ll Ll Ll Ll Ll Ll
y
G G G G G G G G G
R R R G G G G G
R
G
G G G
R R R R R G R
y
G
y y y y
y y y y
R R
R R R R R R R
R
G
G G G G G
G G G G
y
y y y y y
y y y y
1. To silence ringer permanently:
POSITIVE ( +)
PARTIES
RING TIP
(3-7)
(4-8)
L2
L2
L2 L2
A A
K K
L2
L2
L2 L2
K K
G G
L2 L2
Ll Ll
G G
R G
G R
y y
R
R
G G
y y
(a) For all classes of service except tip party identification, connect (Y) mounting cord to same terminal as (R)
mounting cord lead at connecting block.
(b) For tip party with 1000 ohms identification ground; remove (R) ringer from K of network and insulate and store
on unused terminal.
(c) For tip party with 2650 ohms identification ground; remove the (S) ringer lead from K of network and insulate
and store on unused terminal.
(d) For the 501C/D telephone set connect (Y) mounting cord lead to same terminal as (R) mounting cord lead at
the connecting block.
2. If bell taps on stations connected to long line equipment, use these connections to retain party ground identification.
3. When grounded ringer arrangements are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.
4. See Note 4, Fig. 6.
Page 5
SSP 502-501-101-i03_1972-07-0S.;pg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:41:09