Furuno Felcom 82, Руководство оператора

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7. HSD COMMUNICATIONS
7-5
7.2 Automatic HSD Call
7.2.1 How to make an automatic HSD call
Two types of automatic HSD calling are available: direct call and address call.
You can select the calling method from 4 Dial Method on the HSD menu, and the
default setting is direct call.
Direct call (Hot dial)
A single subscriber’s ISDN number is preregistered at the handset.
Communications begin when subscriber’s number is dialed from the HSD
Terminal. For further information see the owner’s manual for the HSD Terminal.
The FELCOM 82 begins processing an HSD call when it receives the DTR ON
signal from the HSD Terminal.
Address call (V25.bis dial)
For HSD communications with multiple subscribers, subscriber’s number is
entered from the HSD Terminal to call.
Calling begins when the FELCOM 82 receives the CRN command.
“CRNxxxxx”: CRN is a V.25bis command, xxxxx is a subscriber’s number
When an HSD communications line is connected, the terminal unit status
displays RX C/H (HSD), RX IF AGC Level (HSD), and 2
nd
Local (HSD).
7.2.2 How to clear an automatic HSD call
Clearing by caller
The line with the subscriber is cleared when the HSD Terminal turns off DTR,
which starts the call clearing sequence. When DTR goes off the FELCOM 82
sends the clear signal to the LES and the HSD modem in the communication unit
of the FELCOM 82 turns off DCD, CTS and DSR.
Clearing by callee
When the callee clears an HSD call, the LES sends the clear signal to the callee’s
HSD Terminal. The HSD modem in the communication unit of the FELCOM 82
turns off DSC, CTS, DSR. The HSD Terminal, in response to the DSR signal,
turns off DTR.