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Signal Ground
Digit Present
Abandon Coli ond Retry
Coli Request
2702 or
Present Next Digit
Automatic
2703
Calling
Unit
Digit Leod NB 1
Digit Lead NB2
Digit Lead NB4
Digit Lead NBS
Power Indicate
Frame Ground
Figure 3-3. Automatic Calling Interface
Pin Number
Circuit
Function
1
FGD
Frome Ground
2
DPR
Digit Present
3
ACR
Abondon Coli and Retry
4
CRQ
Call Request
5
PND
Present Next Digit
6
PWI
PoWer Indicate
7
SGD
Signal Ground
B
11
12
14
NB1
Digit One
15
NB2
Digit Two
16
NB4
Digit Three
17
NBS
Digit Four
20
Figure 3-4. Automatic Calling Unit Interface Pin Circuit Designations
3-4
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