C-11
Hardware Specifications
C.2.5.1 Connecting Switches with TP25 Network Modules
The TP25 network modules have a standard RJ45 connector that uses pins 1,
2, 7 and 8. When connecting switches using TP25 network modules, you will
need to use a UTP crossover cable with the following specification:
• Pin 1 to pin 7 in both directions.
• Pin 2 to pin 8 in both directions.
C.2.5.2 Connecting Switches with Token Ring Pinouts to Cabletron Switches
Although Cabletron Systems’ Switches use the 1, 2, 7 and 8 pin assignment
recommended by the ATM Forum, some switches use pins 3, 4, 5 and 6. Con-
necting one of these switches to a Cabletron Switch would require the connec-
tions to be mapped as follows:
• Pin 3 to pin 7 in both directions.
• Pin 4 to pin 1 in both directions.
• Pin 5 to pin 2 in both directions.
• Pin 6 to pin 8 in both directions.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TP25 Pin TP25Pin
RX+
RX-
TX+
TX-
RX+
RX-
TX+
TX-
Alternative switch Pin Cabletron Switch Pin
RX+
TX+
TX-
RX-
RX+
RX-
TX+
TX-
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8