SMC Networks SMC7500A/VCP - Manual (Page 29)

C
ROSSOVER
C
ABLE
17
Crossover Cable
If the twisted-pair cable is to join two ports and both ports are labeled with
an “X” (MDI-X), or neither port is labeled with an “X” (MDI), a crossover
must be implemented in the wiring.
RJ-11 Ports
Standard telephone RJ-11 connectors and cabling can be found in several
common wiring patterns. These six-pin connectors can accommodate up
to three wire-pairs (three telephone lines), but usually only one or two pairs
of conductor pins and wires are implemented.
The RJ-11 ports on the side of the TigerAccess Extended Ethernet CPE
contain two wire-pairs, an inner pair (pins 3 and 4) and outer pair (pins 2
and 5). On the LINE port, the inner wire-pair carries both voice and
digital data. On the PHONE port, the inner wire-pair carries voice only.
Crossover RJ-45 Pin Assignments
End 1 End 2
1 (TD+) 3 (RD+)
2 (TD-) 6 (RD-)
3 (RD+) 1 (TD+)
6 (RD-) 2 (TD-)