2
Getting Started
28
Transmission Test Set Quick Reference Guide
DCC Port
Connector
9-pin miniature D-type.
Use this port to insert and drop either the D1-D3 DCC channel
or the D4-D12 DCC channel. The first bit of data inserted will be
put into the MSB of the DCC channel. The MSB of the dropped
data bytes will be output first. The transmit (drop) and receive
(insert) capabilities are independent, that is the transmit and
receive clock rates can be set to different rates. The instru-
ment acts as a DCE (Data Communications Equipment), sup-
plying the clock signal for both drop and insert operation.
Rates
D1-D3 DCC: 192 kb/s, D4-D12 DCC: 576 kb/s
Signal Type
Unipolar differential signal as defined in ANSI
EIA-422-B and EIA-423-B.
Input Termination
100 ohms differential.
Input Sensitivity
500 mV over a +/-15 V common mode
range and 200 mV over a +/-7 V range.
Pin Number
RS-449/422 Circuit
1
Rx Data Output (+)
2
Rx Clock Output (+)
3
Signal ground
4
Tx Clock Output (+)
5
Tx Data Input (+)
6
Rx Data Output (–)
7
Rx Clock Output (–)
8
Tx Clock Output (–)
9
Tx Data Input (+)
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