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CHAPTER 2: Introduction
2. Introduction
The Modem 202T is a Bell 202 (CCITT V.23 optional) voice-band, 1200-baud
modem. Use it on private, leased, un-switched telephone lines or any dedicated 2-
or 4-conductor wire (twisted or untwisted, shielded or unshielded). The Modem
has a range of up to 20 miles (32.2 km) on any ordinary wire pairs or unlimited on
“loaded” telephone company voice-grade (VG-6) leased lines.
The Modem 202T can operate without handshake lines using the proprietary
DataSense (DSCC) microprocessor firmware. This feature detects and buffers
incoming RS-232 data to allow the assertion and stabilization of the FSK carrier
before transmitting the buffered characters.
The nominal operating supply voltage for the Modem 202T is 12 VDC via a
2-conductor screw terminal power connector.
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