INSTALLING THE TRMIM-20R
Page 3-6
3.3.2 Trunk Cabling
The TRMIM-20R Ring-In/Ring-Out ports support STP trunk cable
connections. The physical trunk connections, for both the Ring-In
and Ring-Out ports (see Figure 3-4), consist of two pairs of wire: a
transmit signal pair (TX+, TX-) and a receive signal pair (RX+, RX-).
The transmit pair at the TRMIM-20R Ring-Out port interfaces with
the primary ring path and at the Ring-In port interfaces with the
backup ring path. Similarly, the receive pair at the Ring-In port
interfaces with the primary ring path and, at the Ring-Out port,
serves the backup path.
Figure 3-4. STP Trunk Connections
STP TRUNK
CABLING
RING-IN
PORT
RING-OUT
PORT
FROM
PREVIOUS
TOKEN
RING
DEVICE
TO
NEXT
TOKEN
RING
DEVICE
Male DB-9
Connector
Male DB-9
Connector
TRMIM-20R
9
5
6
1
9
5
6
1
BACKUP
RING PATH
ORANGE
RED
BLACK
GREEN
BACKUP
RING PATH
ORANGE
RED
BLACK
GREEN
PRIMARY
RING PATH
RX+
RX+
RX–
RX–
TX–
TX+
TX+
TX–
PRIMARY
RING PATH
