Interface; Functional Description; Figure 3-4. V.35 Interface Card - Comtech EF Data SDM-650B Installation And Operation Manual

Configuration
3.2.2 V.35 Interface

3.2.2.1 Functional Description

The V.35 digital interface (Figure 3-4) provides level translation, buffering, and
termination between the internal modem signals and the V.35 DCE interface connector
on the rear panel.
Electrical characteristics of the interface signals are defined in CCITT Recommendation
V.35.
The electrical and mechanical specifications are summarized in Section 3.2.2.2 and
Section 3.2.2.3, respectively.
A functional block diagram of the V.35 interface is shown in Figure 3-5.
The V.35 interface provides a Serial Clock Transmit (SCT) clock signal at the modem
data rate.
In the Internal clock mode, the data to be transmitted, SD, must be synchronized to SCT.
In the External clock mode, the clock is accepted on the Serial Clock Transmit External
(SCTE) input to clock in the data to be transmitted.
ADDRESS SELECT JUMPERS
JP1 JP16
JP3
JP8
JP10
JP13
JP2
JP14
JP12
3–14
JP15
ASSEMBLY NUMBER
AND REVISION

Figure 3-4. V.35 Interface Card

SDM-650B Satellite Modem
V.35 ADAPTOR
CONNECTOR
Rev. 5