Pin
Function
A
Frame Ground
B
Signal Ground
C
RTS
D
NC
E
DSR
F
DCD
H
DTR
K
NC
L
NC
P
TD (A)
R
RD (A)
S
TD (B)
T
RD (B)
U
SCTE (A)
V
RT (A)
W
SCTE (B)
X
RT (B)
Y
NC
AA
NC
V.35 TO V.35 (CROSS OVER
CABLE) PIN OUT
23
A
AP
PP
PE
EN
ND
DIIX
X
D
D
PATTON ELECTRONICS MODEL 2701
INTERFACE PIN ASSIGNMENT
X.21 Interface
(DB-15 Female Connector)
(DTE /DCE Configuration)
Pin #
Signal
1. . . . . . . . . . . . Frame Ground
2. . . . . . . . . . . . T (Transmit Data-A)
3. . . . . . . . . . . . C (Control-A)
4. . . . . . . . . . . . R (Receive Data-A)
5. . . . . . . . . . . . I (Indication-A)
6. . . . . . . . . . . . S (Signal Element Timing-A)
7 . . . . . . . . . . . BT (Byte Timing-A)
8 . . . . . . . . . . . SGND (Signal Ground)
9 . . . . . . . . . . . T/ (Transmit Data-B)
10 . . . . . . . . . . . C/ (Control-B)
11 . . . . . . . . . . . R/ (Receive Data-B)
12 . . . . . . . . . . . I/ (Indication-B)
13 ........................S/ (Signal Element Timing-B)
14 .......................BT/ (Byte Timing-B)
24
Pin Function
Pin
A
Frame Ground
A
B
Signal Ground
B
C
DCD
F
D
NC
D
E
DTR
H
F
RTS
C
H
DSR
E
K
NC
K
L
NC
L
P
RD (A)
R
R
TD (A)
P
S
RD (B)
T
T
TD (B)
S
U
RT (A)
V
V
SCTE (A)
U
W
RT (B)
X
X
SCTE (B)
W
Y
NC
Y
AA
NC
AA
V.35 TO V.35 (STRAIGHT-
THROUGH CABLE) PIN OUT