User Interface Guide
Express 6503 SHDSL ATM DSU User Manual
16
© 2002 ADTRAN, Inc.
61200296L1-1C
Figure 2. Rear Panel
Connector Pinouts
Table 2 below and Table 3 on page 17 give the pinouts for the V.35 and X.21 connectors.
Table 2. X.21 Interface
Pin
Name
I/O
Description
1
Shield
I/O
Shield for cable
2
TD-A
I
Transmitted Data
3
RTS-A
I
Request to Send
4
RD-A
O
Received Data
5
CD-A
O
Carrier Detect
6
CLK-A
O
Signal Timing
7
ETC-A
I
External Transmit Clock
8
SG
I/O
Signal Ground
9
TD-B
I
Transmit Data (return)
10
RTS-B
I
Request To Send (return)
11
RD-B
O
Receive Data (return)
12
CD-B
O
Carrier Detect (return)
13
CLK-B
O
Signal Timing (return)
14
ETC-B
I
External Transmit Clock (return)
15
NC
N/A
No Connection
I= Input, O= Output, N/A= Not Applicable
NETWORK
V.35
CRAFT
90-240VAC 50/60Hz .1A
X.21
