Configuring the Modem

Option Set 4—Async Answering Central Site Without an ACU (Models 3260/ 62/65/67)

Option Set 4 satisfies the needs of an asynchronous application where most calls are inbound (see Table 4-1).

Because calls are received primarily at the central site, the modem is set to answer calls automatically. With DTR=Discon, the local DTE can control the DTR signal. This allows the local DTE to use DTR transitions to connect the modem to the central site at the beginning of transmission and disconnect it when transmission ends. The DTR signal from the DTE must be high for the modem to auto-answer. If the DTR signal is low, it does not answer incoming calls.

At the beginning of each connection, the modem negotiates the highest common data rate with the remote modem. The modem uses the adaptive rate feature in the V.34, V.32bis, or V.32 modulation modes. This ensures maximum throughput when line quality is poor.

Option Set 4—Sync Leased Line Applications With Dial Restoral (Models 3261/63/66/68)

Option Set 4 uses the modem’s leased line restoral feature. With this option set, the modem operates primarily on a leased line unless that line fails. If so, the modem automatically restores the connection over a single dial line. You must install a 326X Series Modem at both ends of the leased line to implement restoral operation.

Option Set 4 configures the modem for a general restoral application (see Table 4-1). The modem uses the adaptive rate feature in the V.34 orV.32bis Auto modes. This ensures maximum throughput when line quality deteriorates. Ifrestoral criteria are met, the modem automatically reroutes data traffic through the public switched telephone network (PSTN) over a single dial line. At that time, the modem attempts to run at its maximum rate over the dial line, and falls back to lower speeds if required. After an hour, the modem returns to the leased line.

If you operate your modems in leased-line mode with Option Set 4, and one modem has software Revision 7.8 or 7.9, set the Fast Call parameter (AT*FC, Modulation Opts Menu) to Off in both modems.

Option Set Descriptions—326XFAST-SDC Modems

Option Set 1—Async Calls to Central Site

Option Set 1 in the 326X-SDC product functions the same as Option Set 1 above.

Option Set 2—Sync Dial A/B Restoral

Option Set 2 satisfies the needs of a synchronous point-to-point digital link restoral application (see Table 4-2).

With this option set, the Clock is set to External as network timing is provided by the DSU/CSU. NOTE: With this option set, (for Telenetics and Motorola DSU/CSUs as well as non-Telenetics and non-Motorola DSU/CSUs), the DSU’s restoral configura- tion should be set to Timing=Internal.

4-8 Configuring the Modem

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Telenetics V.34-SDC, 326X V.34 manual Option Set Descriptions-326XFAST-SDC Modems, Option Set 2-Sync Dial A/B Restoral
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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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