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CHAPTER 2: Introduction
2. Introduction
With our V.35 Synchronous Modem Eliminator (SME), two synchronous
hosts that are not farther apart than 300 ft. (91.4 m) can communicate with
each other for a fraction of the cost of a pair of high-speed modems. The V.35
SME supports synchronous data rates of 32, 48, 56, 64, 72, 112, 128, and 144
kbps, and can be configured to emulate dialup or leased-line service. Timing
can be set for internal or external clock, and all necessary data, clocking, and
control signals are supported.
The V.35 SME implements the V.35 electrical interface on two standard
M/34 (“34-pin M-block”) female connectors. The unit draws its power directly
from the Request to Send (RTS) and Data Terminal Ready (DTR) signal leads
(Pins C and H) on both ports, so no AC power or batteries are required.
You can configure the V.35 SME’s behavior in several other ways. For
example, you can set it to keep carrier constantly ON or to have carrier follow
RTS; you can also set it to immediately respond to RTS with CTS or to
emulate an RTS-to-CTS delay of 7 or 53 ms.