Appendix A
Motorola, Inc.
549453-001-00-a
Page 47 of 51
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The rear of the switch has two RJ21 connectors; one for the LINE (also called PBX, PSTN, or System) connections
and one for PHONE (also called House or Station) connections. The connector is wired as a 50 pin telco connector,
as follows:
RJ21 Line Connectors
Pin 26 =
line 1 Tip
Pin 1 =
line 1 Ring
Pin 27 =
line 2 Tip
Pin 2 =
line 2 Ring
Pin 50 =
line 25 Tip
Pin 25 =
line 25 Ring
RS-232 console port
Pin 1
Unused
Pin 6
Unused
Pin 2
TXD – transmit data
Pin 7
Unused
Pin 3
RXD – receive data
Pin 8
Unused
Pin 4
Unused
Pin 9
Unused
Pin 5
GND – signal ground
