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Phone:
800-324-8388 970-249-6129 Fax: 970-249-8919 |
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Phone:
800-324-8388 970-249-6129 Fax: 970-249-8919 |
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The G-8000C Transceiver is a narowband modem used for limited spectrum communication media such as radio and wire-pair.
This Modem allows half- or full-duplex communication of RS-232 data over a narrow spectrum up to 600bps.
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The G-9615A comes in an extruded aluminum case and interfaces a dial-up OEM modem to either an RS-232 or an RS-485 port, selectable by a mode switch. On all applications, the RS-232 port is used to set the modem profile for correct handshake with a device on either port.
The RS-232 port is used in single device applications,and the RS-485 port is used in a network of devices communicating at up to 9600bps in an addressed fashion.
The modem is powered with either +5Vdc or 9-30Vdc for a variety of application possibilities.
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The G-9714A also comes in an extruded aluminum case and interfaces either RS-232 or RS-485 data to a leased line circuit running 1200bps data in a 202T fashion.
The RS-232 port is used in single device applications and the RS-485 port is used in 4-wire, addressed networks at 1200bps or less.
The G-9714A is powered with either +5Vdc or 9-15Vdc for a variety of applications.
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The G-8415B Dual 1200 bps Modem consists of a single card with two high quality integrated FSK tone transceivers mounted on it. The G-8414B Single 1200 bps Modem has transceiver B left off the pc board. The only part common between the two modems is the 5.0V regulator.
All inputs and outputs from the modem chip are buffered to EIA RS232C levels. The modems are strapped as standard for 1200 bps, Bell 202 compatible. Strap positions are available for CCITT V23 and Bell 202 operation at 75,150,600 and 1200 bps.
A compromise line equalizer, a bias distortion adjustment, an automatic grain control and a carrier detector level adjustment are provided to optimize the performance and give the lowest possible error rates. Switched capacitor filtering techniques are used in the modem.
Switches are provided so the circuits can be either full duplex for 4 wire operation or 1/2 duplex for 2 wire operation. An adjustable delay of 10 to 200 ms is provided for the clear to send (CTS) lead. This allows the communication circuit to stabilize after a request to send (RTS) signal before data transmission can begin. Optional 10 VA relay contacts may be installed to key local radio sets upon receipt of the RTS signal.
Front LED's indicate the condition of the RTS, CD, TD and RD leads of each transceiver. Test points monitor the 2 wire line, the receiver input level, the transmit data (TD) and the receive data (RD) of each modem.
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The G-9632 A Dial-Up Modem is an auto-answer, auto-dial 14.4 Kbps modem with DB-25 DCE connector on one end and a screw terminal connector on the other for telephone line termination. The G-9632 derives its power from the DTE port of the intelligent device through the DB-25 connector. The G-9632 provides no case and is designed to be a part of other systems. LEDs are provided for indicating activity on the TD and RD data lines.
The G-9632 Dial-Up Modem has positions for both the Cermetek CH1786 2400 BPS modem and the Ceremetek CH1794 14.4 KBSP modem. This allows the G-9632 to be easily upgraded in the field since both sockets are provided. Extened temperature ranges are available for either modem, taking the range to -40°C to +85°C by adding a "ET" to the end of the part number.
The G-9632 utilizes the standard 'AT' command set plus additional commands as defined by the OEM modem manufacturer. A copy of this command set is included with the modem.
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The use of the G-2014-1 on a dedicated full time dry line allows the installation of high speed (600 to 57600 b/s), low cost dial-up modems to upgrade RS-232 communication systems.
The G-2014-1 Ring Generator and Loop Current Power Supply consists of components and circuit groups from the Da-Tel G-8820 PABX and G-9420 PALS which have FCC, Part 68 approval. The G-2014-1 provides ring signal and loop current control for dry dedicated private lines.
Many modems and smart instruments today are designed for the public dial-up system and can not be used on lines without loop current and ring control. The G-2014-1 ring signal and loop current unit provides the control needed for a dedicated dry full time line to operate these public dial-up systems.
Figure 1 Block Diagram shows a typical arrangement in which the G-2014-1 supplies the loop current, ringer signal and logic to allow the use of dial-up modems to down load smart RS-232 instruments or operate two computers, via a dedicated line. Da-Tel Research has two dial-up modems, the G-9615A and G-9632A, which can be used in this application.
The G-2014-1, modem and power supply are mounted into a G-7409 Flat Shelf (1 3/4"X19").
FIGURE 1 Block Diagram
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The G-2529A Notch Filter makes it impossible for a computer to access the internet via a dial-up modem. A modem, as found in a typical laptop requires four frequencies to operate. These voice band tones are 1070, 1270, 2025 and 2225Hz. Da-Tel's Notch Filter blocks 2225Hz from reaching the line, so that when someone tries to dial into an ISP (Internet Service Provider), the call will ring and attempt to connect, fail, then disconnect. Also known as a "reject filter" this passive filter causes no noticeable voice degradation and requires no external power.
The G-2529A provides 8 ports for incoming telco lines and mounting holes for wall mounting at your patch bay or wherever the phone lines come into the building.
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