Multitech MMH900 User Manual page 123

RJ45 Cabling for Internal DSU
{
Receive
{
Transmit
1 2 3 4 5 6 7 8
Back to Back Mux Cable*
25-PIN CONNECTOR (FEMALE)
FG 1
TD
2
RD 3
RTS
4
CTS
5
SG 7
DSR
6
DCD 8
TXC 15
RXC
17
DTR 20
INT. CLK 24
"DCE"
* This cable is used to connect two muxes back to back during testing.
The cable is asymmetrical and allows one of the mux's to provide clock
to the TxC and RxC pins of the other mux. Make sure the configuration
of the composite link includes one of them as having an internal clock
and the other mux an external clock. The Mux Back-to-Back ($MUXB)
command is used during this testing process.
Appendix C - Cabling Diagrams
RT
RR
TT
TR
25-PIN CONNECTOR (FEMALE)
"DTE"
FG
1
RD
3
TD
2
CTS
5
RTS
4
SG
7
DTR
20
INT. CLK
24
6 DSR
DCD
8
TXC
15
RXC
17
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