母頭
Pin | 信號名稱 | 功能描述 | Circuit EIA |
---|---|---|---|
1 | N.C(懸空不用) | ||
2 | Digit Present | A signal given to the ACE indicating that the digit lines contain a digit | DPR |
3 | Abandon Call and Retry | An indicator signal from the ACE that it could not make a connection. Could be "busy". | ACR |
4 | Call Request | A signal from the DTE that tells the ACE to go "off hook" | CRQ |
5 | Present Next Digit | A signal from the ACE to the DTE to indicate that the ACE is ready to receive the next digit. | PND |
6 | N.C(懸空不用) | ||
7 | N.C(懸空不用) | ||
8 | N.C(懸空不用) | ||
9 | N.C(懸空不用) | ||
10 | N.C(懸空不用) | ||
11 | N.C(懸空不用) | ||
12 | N.C(懸空不用) | ||
13 | Distant Station Connected | Indicator from ACE to DTE that the call is succesfully made. | DSC |
14-17 | Digit Signal Circuits | Four lines containing a parallel BCD dial digit (10 digits, plus control digits) | NB1-NB8 |
18 | N.C(懸空不用) | ||
19 | N.C(懸空不用) | ||
20 | N.C(懸空不用) | ||
21 | N.C(懸空不用) | ||
22 | Data Line Occupied | An indicator that is used by the ACE to let the DTE know that the line it wants to use is used by another device. | DLO |
23 | N.C(懸空不用) | ||
24 | N.C(懸空不用) | ||
25 | N.C(懸空不用) |