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DataTalker Owner’s Manual
RJ-48 Cable for Internal ISDN Terminal Adapter
1 2 3 4 5 6 7 8
T
R
RJ-48 Cable for Internal DSU
1 2 3 4 5 6 7 8
RT
RR
{
{
Receive
Transmit
RT
RR
Frame Ground (AA)
Receive Data (BB)
Transmit Data (BA)
Clear To Send (CB)
Request To Send (CA)
Signal Ground (AB)
Data Terminal Ready (CD)
Internal Clock
Data Set Ready
Carrier Detect
Transmit Clock
Receive Clcok
Back to Back Mux Cable
DB-25 FEMALE
CONNECTOR
1
2
3
4
5
7
6
8
15
17
20
24
1
3
2
5
4
7
20
24
6
8
15
17
Frame Ground
Transmit Data
Receive Data
Request To Send
Clear To Send
Signal Ground
Data Set Ready
Carrier Detect
Transmit Clock
Receive Clock
Data Terminal Ready
Internal Clock
DTE
DTE
DB-25 FEMALE
CONNECTOR
This cable is used to connect two DataTalkers back to back. The cable is asymmetrical and allows
one of the DataTalkers to provide clocking to the TxC and RxC pins of the other DataTalker. Make
sure the composite link configurations of the DataTalkers have one of them set for an internal clock
and the other for an external clock.