Black Box ME260A, Owner'S Manual

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20
MODULAR MODEM ELIMINATOR
2.3.2 I
NTERFACING BY
G
ENERAL
-P
URPOSE
M
ODULES
Figure 2-8 shows a typical interface signals flow diagram for an interface converter
application that uses two general-purpose interface modules.
In this application, the mode jumper of the interface module connected to the
DTE must be set to the DCE position, and the mode jumper of the other module
must be set to the DTE position. Interface-control signals are then transparently
transferred from side to side, as shown in
Figure 2-8 .
NOTE
The data rate is determined by the DCE, therefore the DTE must operate
with external timing.
Figure 2-8. Typical interface-signal flow diagram
(two general-purpose interface modules).
External Clock
J1 J2
DCE Mode
DTE Mode
DTE
DCE
Internal Clock
TC
TD
RTS
RC
RD
TTC
DCD
DSR
DTR
CTS
FG
SG
TC
TD
RTS
RC
RD
TTC
DCD
DSR
DTR
CTS
FG
SG