Ethernet 10/100 Base-T Interface Cabling - Motorola OM 2000 Installation & Operation Manual

APPENDIX B — CABLING SPECIFICATIONS
Pin Number
16
17
18
19
20
21
22
23
24
25
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
Cable type
Maximum cable length
Table B-3 — Ethernet 10/100Base-T interface connector pinout
Pin Number
1
2
3
4 and 5
6
7 and 8
55
Signal Direction
BB− In
DD In
LL Out
CA− Out
CD Out
RL Out
CE In
AC Gnd
DA Out
TM In
RJ-45 connector
STP-5 (category 5 shielded twisted pair)
150 feet
Signal Direction
Out
TX+
Out
TX−
In
RX+
n/c
RX− In
n/c In
Description
Receive data −
Receiver clock
Local loopback
Request to send −
DTE ready
Remote loopback
Ring indicator
Chassis
Transmit
Test mode
Description
Transmit data +
Transmit data −
Receive data +
No connect
Receive data −
Data set ready