APPENDIX B — CABLING SPECIFICATIONS
55
Pin Number
Signal
Direction
Description
16
BB
−
In
Receive data
−
17
DD In Receiver
clock
18
LL Out
Local
loopback
19
CA
−
Out
Request to send
−
20
CD Out
DTE
ready
21
RL Out
Remote
loopback
22
CE In
Ring
indicator
23
AC Gnd
Chassis
24
DA Out
Transmit
25
TM In Test
mode
The OM 2000 can either source or sync the transmit clock; this is determined by a
configuration selection. Syncing the clock is needed when sending data through a
modem through a network T1 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
modem to be sent to the network.
Ethernet 10/100 Base-T Interface Cabling
Connector type
RJ-45 connector
Cable type
STP-5 (category 5 shielded twisted pair)
Maximum cable length
150 feet
Table B-3 — Ethernet 10/100Base-T interface connector pinout
Pin Number
Signal
Direction
Description
1
TX
+
Out
Transmit data
+
2
TX
−
Out
Transmit data
−
3
RX
+
In
Receive data
+
4 and 5
n/c
No
connect
6
RX
−
In
Receive data
−
7 and 8
n/c
In
Data set ready
