SDC Option Set 3—Sync Dial Only

In a typical dial application, a remote terminal dials the host for file transfers. This allows remote users to dial in as needed, with a higher throughput than formerly attainable over the PSTN. Alternately, the DTE and host (Figure 4-3)could be nodal equipment (e.g., X.25 PADs, routers, bridges). In this configuration, the SDC modems are used for remote dial-up branch connectivity. This is useful for remote uploading or downloading data over the PSTN as needed.

Select SDC Option Set 3 for either of these applications.

Note the following:

•With Option Set 3, the modem provides the network timing (Clock=Internal).

•Specify the speed at which the modem communicates with the DTE using the

DTE Rate (AT*DE) option, to use a value other than the default. See the DTE Rate description in Appendix A.

•With Option Set 3, the modem originates calls with its V.25bis ACU. DTR is set to 108.1 so that an off-to-on DTR transition instructs the modem to connect to the telephone line. If the modem detects an incoming call, the call is connected. If the modem does not detect an incoming call and you have

enabled Default Dial (AT*DA), the modem dials the number specified. If the Default Dial (AT*DA) is disabled, the modem refers to the Mode option (AT*AC). If set to answer, the modem goes off-hook and sends an answer- back tone. An on-to-off DTR transition disconnects the modem from the

telephone line. If DTR is low, the modem does not auto-answer. DTR transitions govern how the modem answers and disconnects calls.

•If you want the V.25bis ACU to manipulate the DTR signal, set DTR=108.2. Other options in the ACU OPT’S category are set for a typical sync DTE.

•Select SDC Option Set 3 in both the local and remote modems, and ensure that Mode (AT*SM) is set the same in both modems.

•The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This ensures maximum throughput when line quality is poor.

Configuring the Modem

To 56/64 kbps

326XFAST

SDC NMS

Host

PSTN

326XFAST

SDC

DTE

Network Management Channel

Figure 4-3. 326X-SDC Dial-Only Application—Option Set 3

Configuring the Modem 4-25

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Telenetics V.32bis Series, V.34-SDC, 326X V.34 manual SDC Option Set 3-Sync Dial Only, X-SDC Dial-Only Application-Option Set
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326X V.34, V.32bis Series, V.34-SDC specifications

Telenetics has been a key player in the field of telecommunications, offering advanced modem solutions that cater to diverse communication needs. Among their notable products are the V.34-SDC and V.32bis series, including the 326X V.34 modem. These modems have been designed to enhance data transmission reliability and speed in various applications.

The Telenetics V.34-SDC modem represents a significant leap in technology, supporting data rates of up to 28.8 Kbps. This modem utilizes the advanced V.34 modulation scheme, which optimizes the use of existing telephone lines to deliver impressive performance, especially for users requiring high-speed data transmission. The V.34-SDC model also features robust error correction and data compression techniques, ensuring that users receive accurate data even over less than ideal connections. With its extended line-conditioning capabilities, the V.34-SDC modem can efficiently handle long distances and poor line conditions.

Equally noteworthy is the V.32bis series, which provides backward compatibility with V.32 modems, enabling seamless integration into existing systems. Capable of speeds up to 14.4 Kbps, the V.32bis modems are ideal for businesses and environments where legacy systems remain in use. It features adaptive equalization and advanced echo cancellation, ensuring a clear signal is maintained throughout the data transmission process. This versatility allows users to connect with various devices across different infrastructures.

The 326X V.34 modem further exemplifies Telenetics' commitment to high performance. It combines the V.34 capabilities with enhanced security features, offering users encryption options for sensitive data. This is particularly crucial for businesses that need to safeguard their information against potential vulnerabilities during transmission. The 326X also supports various data communication protocols, making it adaptable for multiple platforms and applications.

In summary, Telenetics’ V.34-SDC, V.32bis series, and 326X V.34 modems stand out for their high-speed data transmission, compatibility, advanced error correction, and security features. These technologies make them excellent choices for both enterprise and networking applications where reliable communication is vital. Telenetics continues to innovate, delivering modem solutions that meet the evolving demands of the telecommunications landscape.
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