Bell 502-580-408 Service Manual
BELL SYSTEM PRACTICES SECTION 502-580-408
AT&TCo Standard Issue 6, July 1979
SERVICE
500R/S AND 500SM TELEPHONE SETS
CONNECTIONS
1. GENERAL STABLE A(I
LINE AND C4B RINGER CONNECTIONS
!.01 This section contains information on the 500R/SAND500SM
500R/S (MD) and 500SM telephone sets.
1.02 This section is reissued to: (NOTE 1) PARTY
WIRE OR LEAD RING
COLOR NO IDENT
TIP PARTY
GROUND
• Show 500R/S telephone sets MD Mtg Cord (W-BL)
• Revise Fig. 2 to update information. 500R/S [G]
in Set F F
623D4
Jack (G) F F
500SM
Move Strap from
F Term on Net. to (G) E1
Move Strap from
Term. 3 to (S) E1
C4B Ringer (R) K K
(Note 2) (BK) G G
Mtg Cord [R ]
at Conn Block (W-BL) Tip Ring
(Line Only ) [G ]
500R/S (BL-W) Ring Tip
Line Wire
at Conn Block (R) Ring Ring
500SM (G) Tip Tip
Note 1" Only the optional leads are shown in the table.
Connections for the remaining leads are shown
in Fig. 1 and 2.
Note 2: To permanently silence ringer, refer to Section
501-250-303.
( ) Current color code.
[ ] MD color code.
(G-W) Ring Tip
[BR-G]
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1
SECTION 502-580-408
TABLE B
LINE AND C4A RINGER CONNECTIONS 500R/S
WIRE INDIV TIP PARTY IDENT
OR COLOR OR NO IDENT GRD
LEAD BRIDGED GROUND 1000_'-'2 2650_-_
Mtg Cord (W-BL) G F F F F
in Set [G]
Strap from
G Term. on (G) F E1 E1 E1 E1
Net. to
C4A (BK) G G G G B
Ringer (S) K K K B K
Line (W-S) Term. Term. Term. A of A of
Switch [S-BR ] 2 2 2 Net. Net.
M_ [R]
Cord at (W-BL) Tip Tip Ring Ring Ring
0o_ [G ]
Block (BL-W)
(Line Only) [ BR-G ] Ring Ring Tip Tip Tip
Strap
from A
To L2 on (S) * * * * *
Net,
44A Conn
Block 1 to 6 1 to 6 2 to 6 2 to 6 2 to 6
Strap
(R) L2 L2 L2 K B
(S-R) A A A B G
(G-W) Ring Ring Tip Tip Tip
RING
PARTY
TIP PARTY
Page 2
Note: To permanently silence ringer, refer to Section 501-250-303.
• Remove strap, if in place, when using C4A ringer.
( ) Current color code
[ ] MD color code
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