13
VHSI Port Interface Specifications
The V.35 Interface
The pin-out assignments for the V.35 interface are shown in the following
diagram.
The signal definitions and names are listed in Table 6 below.
Pin #
Signal
Name
Direction
CCITT #
A
PGND
Protective Ground
Common
101
B
SGND
Signal Ground
Common
102
C
RTS
Request to Send
Output
105
D
CTS
Clear to Send
Input
106
E
DSR
Data Set Ready
Input
107
F
DCD
Data Carrier Detect
Input
109
H
DTR
Data Terminal Ready
Output
108
J
RI
Ring Indicator
Input
125
L
TEST
Local Loopback Activation
Output
141
N
RLB
Remote Loopback
Output
140
P
TXD+
Transmit Data
Output
103A
R
RXD+
Receive Data
Input
104A
S
TXD-
Transmit Data
Output
103B
T
RXD-
Receive Data
Input
104B
U
CLK+
Transmit Clock (DTE)
Output
113A
V
RCLK+
Receive Clock (DCE)
Input
115A
W
CLK-
Transmit Clock (DTE)
Output
113B
X
RCLK-
Receive Clock (DCE)
Input
115B
Y
TCLK+
Transmit Clock (DCE)
Input
114A
AA
TCLK-
Transmit Clock (DCE)
Input
114B
NN
TI
Test Indicator
Input
142
Table 6: V.35 Interface Signals
Figure 8: V.35 Interface
P G N D
R XD +
R T S
RI
D C D
SGND
T X D+
C T S
DSR
D T R
C LK +
TEST
R LB
TI
R C LK +
TX D -
R X D -
C LK -
R C LK -
T CLK+
TC LK -
A
NN
MM
B
