Chamberlain SENTEX INFINITY Installation Instructions Manual page 5

TELEPHONE INTERFACE BOARD CONNECTIONS
NOTE: To avoid potential damage to the board, remove power to the unit BEFORE connecting or disconnecting the phone line.
1. Connect a 2-conductor, 18 to 22 AWG cable to TELCO LINE on the telephone interface board (Figure 2 or 3).
2. Connect the other end of this cable to the "tip" and "ring" terminals on the telephone company jack (polarity is unimportant).
NOTE: Installation where fiber optic phone lines are present may require additional modifications from your telephone provider. Contact
your provider for more information.
Figure 2
TELEPHONE INTERFACE BOARD (SN1100329)
Line
Ring
Click
Detect
DAUGHTER BOARD (SN1110080)
Mic
Panel
Sens
Mic
Click
Level VR3
W I R I N G
Panel Speaker J1
Off Hook
Click
Handset
Level
Speaker
Level VR4
Line
Bal 1
Line
Telco
Bal 2
Line
Figure 3
TELEPHONE INTERFACE BOARD (SN1110429)
Line
Click
Ring
Click
TB1
Enable
Mic
Sens
Click
Level
5
Off Hook
Speaker Level VR4
Panel
Line
Mic
Bal 1
Line
Telco
Bal 2
Panel Speaker J1
Handset
TB1