Chamberlain EL MODELS User Manual
Page 10
Wiring Multiple Units to Telco Line
Wiring Multiple Units to Telco Line
Up to 7 units can share the same phone line. The bypass boards allow the units to be disconnected without
interrupting normal telephone operation.
interrupting normal telephone operation.
NOTE: Installation where fiber optic phone lines are present may require additional modifications from your
telephone provider. Contact your provider for more information.
telephone provider. Contact your provider for more information.
• When the units are in use, the bypass switches must be set to the operate position.
• When the units are disconnected, the bypass switches must be set to the bypass position.
Tip
Ring
Tip
Ring
RES
TELCO
Tip
Ring
Tip
Ring
RES
TELCO
OPERATE
BYPASS
Ring
HOME
Tip
Ring
TELCO
Tip
SYSTEM
4 3 2 1
BYPASS
Ring
TELCO
Tip
Bypass Board for Unit 1
Bypass Board for Unit 2
Ring
Ring
Ring
Tip
Tip
Tip
Ring
Tip
Use 18-24 AWG
2 twisted pair
IMPORTANT: You must program the unit ID's
for each unit wired in the series. See Keypad
Programming Manual.
for each unit wired in the series. See Keypad
Programming Manual.
OPERATE
BYPASS
Ring
HOME
Tip
Ring
TELCO
Tip
SYSTEM
4
3
2
1
Last Bypass Board
4
3
2
1
Home Phone
Unit ID 1
Output Board
(See page 6)
Telco Entrance Box
Demarcation Point
DO NOT overload the removable
terminal block connectors. One wire
per hole.
terminal block connectors. One wire
per hole.
IMPORTANT: The Bypass
Boards (located inside the
property) allow access to
the phone in case any of
the units fail.
Boards (located inside the
property) allow access to
the phone in case any of
the units fail.
Never run Telco wires and High
Voltage wires in the same
conduit. The high voltage wires
may interfere with the Telco
wires, possibly causing the
system to malfunction.
Voltage wires in the same
conduit. The high voltage wires
may interfere with the Telco
wires, possibly causing the
system to malfunction.
4 3 2 1
Unit ID 2
Output Board
(See page 6)