User guide

Appendix A
Motorola, Inc. 549453-001-00-a Page 47 of 51
A
A
p
p
p
p
e
e
n
n
d
d
i
i
x
x
A
A
:
:
P
P
i
i
n
n
-
-
o
o
u
u
t
t
A
A
s
s
s
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i
i
g
g
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m
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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