Straight-Through Wiring; Crossover Wiring - Cabletron Systems SmartSTACK ETHERNET ELS10-27 User Manual

1
2
3
6
a. The Ò+Ó and Ò-Ó signs are used to represent the polarity of the two
wires that make up each wire pair.
A.4 STRAIGHT-THROUGH WIRING
If the twisted-pair link segment is to join two ports on a switch, and only
one of the ports has an internal crossover, the two pairs of wires must be
straight-through, as shown in Table A-4.
Table A-4. Straight-Through RJ45 Pin Assignments
SmartSTACK Ethernet ELS10-27
(Crossed)
1 (Rx+)
2 (Rx-)
3 (Tx+)
6 (Tx-)
A.5 CROSSOVER WIRING
Two SmartSTACK Ethernet ELS10-27s can communicate only if the
transmitter on one unit is connected to the receiver on the other unit. This
reversal, or crossover function, can be implemented either in the wiring
or in the device itself. When connecting SmartSTACK Ethernet ELS10-27s,
a crossover must be implemented in the wiring. Refer to Table A-5 for
crossover pin assignments.
Table A-3. 10BASE-T Pin Assignments
Pin

Straight-through Wiring

Assignment
Rx+
Rx-
Tx+
Tx-
Device (Not Crossed)
1 (Tx+)
2 (Tx-)
3 (Rx+)
6 (Rx-)
a
A-5