Internet connectivity via a standards-based digital modem that breaks the analog speed barrier
The 3Com Impact(TM) External Digital Modem provides high-speed ISDN access to the Internet over a dial-up link. All-digital ISDN speed allows graphical cruising of the Internet with reduced delays and lower telephone charges.
The 3Com Impact(TM) ISDN External Digital Modem utilizes ISDN service available from the telephone company to transmit at 56 or 64 Kbps--about 25 times faster than 2.4 Kbps modems and at least twice as fast as the latest generation of V.34 modems. With ISDN connections, dial-up Internet users can cruise the World Wide Web and download large files at speeds normally reserved for corporations with expensive leased lines.
Based on industry standards, the 3Com Impact modem is compatible with a wide array of Internet browsers, communications software packages for modems, and Internet Service Provider (ISP) equipment.
Key Benefits:
High-Speed, Reliable Dial-Up Internet Access
* The 3Com Impact external digital modem delivers dial-up Internet access at up to 25 times the speed of analog modems, providing LAN-like response.
* The 3Com Impact modem always connects at the top speed available and maintains that speed for the entire connection--unlike analog modems that deal with line "noise" and often drop to a lower speed in the middle of a connection, or lose the connection entirely.
System Compatibility
* Through the AT command set and IETF Point-to-Point Protocol (PPP), the 3Com Impact modem supports the major Internet browsers.
* 3Com Impact implements V.30 and Async-Sync(TM) PPP conversion, and has been tested for interoperability with ISDN equipment in use at leading ISPs.
* The analog voice port supports existing telephones, fax machines, and answering machines, letting them operate simultaneously with PC data transmission and allowing a home office user to replace several analog lines with a single ISDN line.
Ease of Installation and Use
* To avoid the need for extra equipment, ISDN network termination (NT-1 for the ISDN U interface) is integrated into the 3Com Impact .
* Front panel LEDs and a diagnostic self-test give the user valuable information on ISDN line status and connections.
3Com Impact ISDN External Digital Modem
Analog vs. ISDN Performance
ISDN digital modems are more than twice as fast as the very best V.34 analog modems--and more than 25 times as fast as many analog devices. For Internet users, high-speed ISDN links avoid long delays in finding data resources and downloading files. High-speed transmission saves money, too, by cutting telephone charges.
In fact, ISDN digital modems can be three or four times faster than the best analog products. Digital modems always connect at the top speed available and maintain that speed for the entire connection, while 28.8 Kbps analog modems often drop down to 19.2 or even 14.4 Kbps because of line conditions.
To benefit from high-speed all-digital connections, ask your Internet Service Provider (ISP) about ISDN availability in your location.
Here are ISDN speed improvements:*
Analog Modem 64 Kbps ISDN
Speeds, Kbps Modem Advantage
2.4 26.7 times faster
9.6 6.7 times faster
14.4 4.4 times faster
28.8 2.2 times faster
*Data compression increases the effective throughput of both analog and digital modems, so the relative advantage of ISDN stays the same.
Specifications
QuickAccess Remote External Digital Modem
Dimensions
Length: 10 in/25.4 cm
Width: 7 in/17.8 cm
Height: 1.5 in/3.8 cm
ISDN Signaling
North Amrican National ISDN-1 (NI-1)
AT&T and Northern Telecom custom ISDN signaling
Circuit switched data
Circuit switched voice
Circuit-Switching Compatibility
Support for Switched 56 circuits
Compatibiliy with Switched 56 CSUs and ISDN terminal adapters (TAs)
Protocol Support
TCP/IP PPP
Async PPP to synch PPP conversion
ANSI v.120
mu-law pulse-code modulation (PCM)
Voice and G3 fax
Network Port
ISDN Basic Rate Interface (BRI): Two 56 or 64 Kbps bearer (B) channels and one 16 Kbps control (D) channel
Built-in NT-1 termination with 2B1Q interface
Data Port
Female 9-pin D connector
RS-232 at 115.2 Kbps asynchronous
AT command set dialing
Autobaud matching of transmission speeds up to 115.2 Kbps
Hardware flow control
Optional Voice Port
RJ-11 modular connector
Touch-Tone (AT&T 2500) compatibility
Battery feed: 20 mA
Ringing voltage: 86 VAC
Two extensions within 100 feet (30.5 meters)
Diagnostics and Software Updates
LEDs for operation, call status, and local diagnostics
Remote diagnostics
Loopback tests
Flash memory for field software updates
Mean Time Between Failures
50,000 hours
Power
Input: 117 VAC
Output: 12 VAC
Power dissipation: 8 W
Environmental Ranges
Operating: 50[[ring]] to 122[[ring]] F (10[[ring]] to 50[[ring]] C)
Nonoperating: -40[[ring]] to 149[[ring]] F (-40[[ring]] to 65[[ring]] C)
Relative humidity: up to 90% noncondensing
Standards Compliance
UL listed
FCC Part 15, Class B
Bellcore NI-1
IETF TCP/IP PPP
ANSI V.120
Ordering Information
QuickAccess Express Digital Modem (includes user manual and quick installation guide, wall power supply, serial cable, and software diskettes)
For PCs 3C870
For Macintosh 3C875
MS DOS configuration software (includes TurboCom Windows Software and
Internet Chamelon 30-day trial copy ) 3P871 Macintosh configuration software 3C875
(c) 3Com Corporation 1995. All rights reserved. 3Com is a publicly owned corporation (NASDAQ:COMS). 3Com is a registered trademarks and Impact is a trademark of 3Com Corporation. Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries. Macintosh is a registered trademark of Apple Computer, Inc. Windows is a registered trademark of Microsoft Corporation. Other brand and product names may be trademarks or registered trademarks of their respective owners.
All specifications are subject to change without notice.
Printed in U.S.A. 400199-001 3/95