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- The Courier HST Dual Standard modem combines U.S. Robotics HST
- asymmetrical full-duplex modulation and CCITT V.32 capability for high-
- speed flexibility, performance and compatibility.
- The Courier HST Dual Standard is perfect for data centers that
- support both PC and mainframe applications, and where synchronous and
- asynchronous capabilities are required.
- The Dual Standard includes all major modulation techniques -
- HST, V.32, V.22 bis, V.22, V.21, Bell 212A and Bell 103 - providing
- compatibility with the vast installed base of synchronous and
- asynchronous modems from 300 to 19,200 bps, including all current and
- previous models of U.S. Robotics Courier HST modem.
- For typical, asynchronous, PC-style applications such as one-
- way file transfer, the Dual Standard modemâ•’s HST technology provides
- the fastest error-free transmission available on dial-up circuits.
- The Dual Standard modem V.32 capability is the versatile
- solution for applications requiring true full-duplex and/or synchronous
- transmission, such as host-to-host or micro-to-mainframe comunication,
- remote LAN bridging, two-wire leased lines, leased line dial backup or
- high-speed international standards compatibility.
- In its asymmetrical HST operation, the Dual Standard modem
- transmits asynchronous data at 9.6, 7.2 and 4.8 Kbps, automatically
- providing the fastest data rate in response to phone line conditions.
- In V.32 mode, the Dual Standard modem sends and receives asynchronous
- or synchronous data at 9.6, 7.2 and 4.8 Kbps.
- The Dual Standard modem also provides CCITT V.42 compatibility
- by including MNP Class 1 through 4 error-control protocols. The modem
- also features MNP Class 5 data compression, effectively boosting its
- data rates by up to 80 percent when connected to other MNP Class 5
- modems.
- In HST mode, the Dual Standard uses U.S. Robotics asymmetrical
- full- duplex modulation technique, splitting the phone line bandwidth
- into non- overlapping high-speed and low-speed channels. The modem
- automatically assigns the high-speed channel direction based on
- dataflow demand. The HST technique uses trellis-coded modulation for
- high-speed, error-free performance.
- In V.32 mode, the Dual Standard operates simultaneous
- send and receive frequencies using trellis-coded modulation and echo-
- concelling.
- Courier HST Dual Standard is available in external and
- rackmounted models. The rackmounted version works in U.S. Robotics
- Rackmount 30 Modular Modem System, which includes a 19-inch-wide
- chassis for up to 15 modem and interface boards.
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- DESCRIPTION
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- 7.2 and 4.8 Kbps in V.32 mode, and at 2400, 1200 and 300 bps in either
- mode.
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- Data Compression - MNP Service Class 5 compression, available at all
- transmission speeds above 300 bps, increases effective throughput by up
- to 80 percent.
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- Error Checking - MNP Service Classes 1 through 4 at all speeds above
- 300 bps (asynchronous transmission only).
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- Hardware/software flow control allows fixed RS-232 rates up to 19.2
- Kbps.
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- Asynchronous or synchronous transmission on dial-up or leased lines.
- Synchronous available in V.32 mode only at all speeds above 300 bps.
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- Auto-dial - asynchronous ("AT" command set), synchronous (nonvolatile
- RAM).
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- Ease of Use Features:
- Automatic transmission-speed adjustment guarantees highest
- possible speed under a wide range of conditions.
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- Automatically adapts to the highest data rate supported by the
- remote modem.
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- Speaker with volume control for audio call-progress monitoring.
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- On-screen and bottom label help summaries.
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- RS232-C pins 2 and 3 (Send and Receive data) switch-reversible
- for easy use with terminal, computer or printer.
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- Technical Specs:
- Twelve LED front panel indicators.
- Local analog and digital loopback, and remote digital loopback self-
- testing.
- U.S./CCITT answer sequences.
- Includes power adapter and RJ11C phone cord.
- Two phone jacks for voice/data communications.
- Size: 8.3" wide, 12.65" deep, 1.57" tall.
- Power adapter UL listed, CSA approved. Supply voltage:
- 115 VAC, 60 Hz, 16 VAC output.
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- SPECIAL FEATURES
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- High-Speed Operation - Courier HST Dual Standard offers the most
- productivity, flexibilty and compatibility.
- HST mode - High-speed compatibility with all Courier HST
- modems.
- V.32 mode - Compatible with all CCITT V.32 standard modems.
- Trellis-coded modulation in both high-speed modes ensures maximum
- immunity to telephone network impairments.
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- Nonvolatile Random Access Memory (NRAM) - Easily programmable
- nonvolatile memory stores user-defined default configuration.
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- Phone Number Storage - Creates auto dial directory of four frequently
- called phone numbers.
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- Automatic Dialing - "AT" command dialing and automatic dialing of
- stored phone number at power on, reset command or when terminal turns
- on DTR.
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- Synchronous Auto-Dialing - Automatically dials stored phone number,
- then establishes synchronous data link.
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- Diagnostics - Local and remote loopback testing provides DTE, modem
- and phone line diagnostic capabilities.
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- COMPATIBILITY
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- Courier HST-compatible at 9.6, 7.2 and 4.8 Kbps.
- CCITT V.32-compatible at 9.6, 7.2 and 4.8 Kbps.
- CCITT V.22 bis-compatible at 2400 bps.
- CCITT V.22- and Bell 212A-compatible at 1200 bps.
- CCITT V.21- and Bell 103-compatible at 300 bps.
- Uses "AT" auto-dial command set in asynchronous mode.
- CCITT V.42-compatible (MNP Class 1-4 error control).
- MNP Class 5 data compression.
- FCC, DOC certified.
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- A WORD ABOUT U.S. ROBOTICS
-
- When you purchase a modem, you buy more than data communications
- hardware. When you purchase a modem, you buy a relationship with an
- organization. To help in your evaluation, I would like to introduce us
- to you.
- We are U.S. Robotics. We are more than 175 people dedicated to
- designing, manufacturing and providing quality products, services and
- systems to enhance the capabilities of business and professional
- customers worldwide. Our mission is to strive to be "the best data
- communications company."
- Since our start in 1976, we have sold more than one million
- modems, and led the industry with many technological firsts. For
- example, we built the first modem using off-the-shelf microprocessor
- technology (1982), and the first surface-mount-technology modem (1987).
- Over the years, we have honed our quality control and manufacturing
- capabilities by making modems for Apple, Commodore, Zenith, Kaypro and
- Grid. This is reflected in our own Courier and Sportster products. For
- three out of four years,we have made the INC. 500 list of fastest
- growing private firms.
- I know you have a modem choice. As you will discover, the
- difference between vendors is partially technological - Data
- Communications magazine rated our Courier HST as the #1 high-speed
- modem (April 1988). Part of it is the way the vendor relates to its
- customers. USR was ranked as the #1 overall performing modem vendor by
- modem users surveyed by Datapro Research (October 1988).
- We are proud of our accomplishments and of the service we
- provide to our customers. Thank you for considering U.S. Robotics
- products. I believe we have much to offer, and we look forward to
- satisfying your data communications needs.
-
- Sincerely yours,
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- Jonathan Zakin
- Executive Vice President, Sales & Marketing
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