Data Sheet
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Support for the 56K modem technology allows users to achieve maximum data transfer rates,
while still allowing support for V.34 technologies. The modems are software upgradable, and will
support future standards as they become available. This high speed ensures the fastest
downloads of Web pages and files.
Note: Actual speeds vary, depending on line conditions. Because of FCC limitations, speeds in
the United States are less than 56 kbps.
V.92 and V.44 Support
The V.92 and V.44 standards provide consumers and teleworkers what is called a "broadband-lite"
Internet experience at dialup prices. V.92 encompasses numerous specifications, including "Quick
Connect," which dramatically improves how quickly users can connect with their ISP or a branch
office, and "modem on hold," which enables users to suspend and reactivate their dialup
connection to either receive or initiate a telephone call. This can be a tremendous productivity
enhancement for teleworkers because they do not have to waste valuable time dialing back into
a central site every time they get a phone call.
V.44 technology provides a new standard for compressing data. When compared to V.42,
throughput is increased 20 to 60 percent because of a new compression algorithm that is
optimized for typical Web content. Of all the new features, V.44 is the only one that speeds the
delivery of Web pages to the end user.
Note: The V.92 standard also includes support for pulse code modulation (PCM) upstream,
which boosts the upstream data rates from the user. However, PCM upstream is not supported
on the digital modem network modules because of limitations in the Modem ISND Channel
Aggregation (MICA) modem technology.
Single Solution for Modem and ISDN Callers
The Cisco 3600, 3700, and 3800 can take incoming ISDN or voice calls and automatically switch
them to the appropriate internal circuitry. The PRI and BRI switching is based on Q.931 messaging
in the ISDN D channel. This out-of-band signaling channel provides a way for the telephone
network to label each call as to the type of call. Specifically, when an incoming call is labeled
"voice" by the telephone network, the Cisco 3600, 3700, and 3800 direct it to one of its modems.
When a call is labeled "ISDN data," it is directed to one of its High-Level Data Link Control (HDLC)
controllers. The benefits here are one phone number for modem and ISDN users. R2 and CT1
interfaces also support this switching ability.
Ease of Management
The Cisco 3600, 3700, and 3800 provide complete, centrally managed modem capabilities, key
requirements for branches and enterprises building midsize dial-in pools. The Cisco 3600, 3700,
and 3800 modems can be managed via the same Simple Network Management Protocol (SNMP)-
based tools used to manage the rest of the network, providing network managers with one solution
at a central management point. Optional enhanced modem management (Management Modem
Technology License [MMTL]) capabilities allow for the gathering of modem statistics, real-time
call-in-progress, monitoring modem activity log, modem hard and soft busy out, and the ability to
accomplish modem firmware upgrades.
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