V.25 Bis 108.2 Mode Interface Specifications; Interface Connections - General DataComm SpectraComm V.34 Installation & Operation Manual

V.25 bis Command Set Operation
3. Hang up the handset. You may now commence data communications.
4. To terminate communication, turn Off terminal interface circuit 108.1.

V.25 bis 108.2 Mode Interface Specifications

Physical connections between a DTE and a DCE may be either synchronous or asynchronous. The
ITU-T V.25 bis 108.2 mode recommendations describe the exchange of commands and responses
between the units using both types of operation. The V. 34 supports command/response exchange
in either mode.
The following paragraphs describe the functional characteristics of the V.25 bis synchronous and
asynchronous interfaces, as used in the Dual V.34 Modem.

Interface Connections

From DCE to DTE:
104 RXD
106 CTS
107 DSR
125 Call Indicator/Ring Detector
114 TX Timing (synchronous only)
115 RX Timing (synchronous only)
From DTE to DCE:
103 TXD
105 RTS
108.2 DTR
113 TX Timing (synchronous only)
5-12
V.25 bis 108.2 Mode Interface Specifications
SpectraComm Dual V.34 Modem
Installation and Operation
060R122-000
Issue 15