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CHAPTER 9: TECHNICAL INFORMATION
The following table is for reference only and provides the wiring configuration of the adapter cable
used with the High Speed Synchronous Enhancement Board. The connector on the High Speed
Synchronous Enhancement Board is a 25-pin male which mates with the 25-pin female connector on
the adapter cable.
Table R:
V.35 Adapter Cable
Pin 7/B - Signal Ground
This circuit provides the common reference level for unbalanced interchange circuits (RTS, RFS,
DSR, RLSD).
Pin 4/C - Request-to-Send
The Request-to-Send is generated by the DTE to control half-duplex emulation data transmission.
The ON state of this circuit indicates that the DTE is prepared to transmit data.
Pin 5/D - Ready for Sending
The Ready for Sending circuit is controlled by the 7500 to indicate when data can be received from
the DTE. The Ready for Sending circuit operates as follows:
The OFF to ON transition of the Ready for Sending circuit follows the OFF to ON transition of the
Request to Send circuit by a fixed time delay in the range of 17 to 80 msec. This delay guarantees that
the OFF to ON transition of the Ready for Sending circuit occurs after the remotely connected terminal
adapter's Received Line Signal Detect lead turns ON. The ON to OFF transition of the Ready for
Sending circuit follows the ON to OFF transition of the Request to Send circuit by not more than 5
msec.
136
V.35 PIN
HIGH SPEED
SYNC PIN
B
14
C
1
D
8
E
5
F
7
H
3
6
J
2
L
N
4
P
13
R
17
S
24
T
16
V
21
X
20
Y
19
AA
18
15
NN
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