REQUIREMENTS/SPECIFICATIONS
Page 2-7
Rx +
Tx-
Tx+
Rx-
1
2
3
4
5
6
7
8
FEMALE RJ-45
TCU Ports:
Pin
Pin
1 No Connection
5 RX–
2 No Connection
6 TX+
3 TX–
7 No Connection
4 RX+
8 No Connection
Figure 2-1. Trunk Coupling Unit RJ-45 Pinout
STP Trunk Connections - Two Female DB-9 connectors for
attaching STP trunk cables are located on the lower left side of the
TRMIM-20R front panel. Figure 2-2 shows the signal and pin
assignments for the STP ring interface.
Trunk Port:
Pin
Pin
Ring-In
1 RX– (Main Ring)
5 TX– (Backup Ring)
2 Ground
6 RX+ (Main Ring)
3 Ground
7 Ground
4 Ground
8 Ground
9 TX+ (Backup Ring)
Ring-Out
1 TX– (Main Ring)
5 RX– (Backup Ring)
2 Ground
6 TX+ (Main Ring)
3 Ground
7 Ground
4 Ground
8 Ground
9 RX+ (Backup Ring)
Figure 2-2. Trunk Cable Connections
FEMALE DB-9 RECEPTACLE
TX+ (Backup Ring)
6
7
8
9
1
2
3
4
5
(Main Ring) RX-
Common
Ground
Common
Ground
(Backup Ring) TX-
FEMALE DB-9 RECEPTACLE
RX+ (Backup Ring)
6
7
8
9
1
2
3
4
5
(Main Ring) TX-
Common
Ground
Common
Ground
(Backup Ring) RX-
RX+ (Main Ring)
TX+ (Main Ring)
RING- IN
RING-OUT
