Multitech MMH900, User Manual

Page: 123 / 200

123
Appendix C - Cabling Diagrams
RJ45 Cabling for Internal DSU
1 2 3 4 5 6 7 8
{
{
Receive
Transmit
RT
RR
TT
TR
Back to Back Mux Cable*
25-PIN CONNECTOR (FEMALE)
1
2
3
4
5
7
6
8
15
17
20
24
1
3
2
5
4
7
20
24
6
8
15
17
FG
TD
RD
RTS
CTS
SG
DSR
DCD
TXC
RXC
DTR
INT. CLK
25-PIN CONNECTOR (FEMALE)
FG
RD
TD
CTS
RTS
SG
DTR
INT. CLK
DSR
DCD
TXC
RXC
“DCE” “DTE”
* 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.