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APPENDIX B — CABLING SPECIFICATIONS
P i n
N u m b e r
Signal
D i r e c t i o n
D escri ption
1 6
B B -
I n
R e c e i v e d a t a -
1 7
D D
I n
R e c e i v e r c l o c k
1 8
L L
O u t
Local loopback
1 9
C A -
O u t
Request to send -
2 0
C D
O u t
DTE ready
2 1
R L
O u t
Remote loopback
2 2
C E
I n
Ring indicator
2 3
A C
G n d
C h a s s i s
2 4
D A
O u t
T r a n s m i t
2 5
T M
I n
T e s t
m o d e
The OM 2000 can either source or sync the transnnit clock; this Is detetinined by a
configuration selection. Syncing the clock Is needed when sending data through a
nnodem through a networkll line. In this case, the modem sources a clock that Is
locked to the network. The OM 2000 syncs the clock and sources data to the
m o d e m t o b e s e n t t o t h e n e t w o r k .
Ethernet 10/100 Base-T Interface Cabling
Connector type
R J - 4 5 c o n n e c t o r
Cable type
STP-5 (category 5 shielded twisted pair)
Maximum cable length
1 5 0 f e e t
Table B-3 — Ethernet 10/100Base-T interface connector pinout
P i n
N u m b e r
Signal
D i r e c t i o n
Descrip ti on
1
T X +
O u t
T r a n s m i t d a t a +
2
T X -
O u t
T r a n s m i t d a t a -
3
R X +
I n
R e c e i v e d a t a +
4 a n d 5
n / c
N o c o n n e c t
6
R X -
I n
R e c e i v e d a t a -
7 a n d 8
n / c
I n
Data set ready
55
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