V.92 dial-up modem standard

Features

• Compliant with V.92 modem and V.92 modem Appendix I, upgrades are provided as the as recommendation is improved.
• Modem MIB Support (RFC 1696)
• Specifies 22 modulation rates in range of 28000 bps to 56000 bps, in increments of 1 1/3 kbps. (Administration requirements may restrict maximum rates/power allowed).
• Analog modem DAA interface using linear codec at 16.0 kHz sample rate.
• Digital modem direct interface to 8.0 kHz PCM data stream (A-law or m-law).
• PPP (RFC1662), V.14, HDLC and direct binary framing layers available.
• North American and International Dialing/Telephony functions available.
• Data protocol layer (V.42/MNP2-4/V.44/V.42bis/MNP5) available.
• System can be combined with V.110 rate adaptation software.
• System can be combined with other modulations (V.90, V.34, V.32bis, et al.) and automode procedures (V.8bis, V.8 and PN-2330).
• Data/Facsimile/Voice Distinction upon startup available. Complete facsimile systems, modulations (V.34, V.17 et al.) and protocols (T.30), and speech coders available.
• Multi-tasking environment compatible.

Benefits

• PCM upstream (PCM): V.92 specification allows a PCM upstream at rate from 24,000bps to 48,000bps. The rate increments in steps of 1.33 kbps as in V.90. Upstream rates could be 24k, 25.3k, 26.6k, 28k, etc. This is a 30% increase over the 33.6K bps attainable by V.90 modems. This higher upstream speed offers numerous benefits including a reduction in the upstream data transfer time for large e-mails with attachments and for ftp site uploads, as well as improved operation for interactive applications. Due to the real conditions of the phone lines the 48 kbps upstream is very hard to obtain.
• Modem On Hold (MOH): Allows modems to stay connected "on-hold" while you take an incoming call waiting call, or initiate an outgoing voice call (works only if V.92 server modem is configured to allow this feature). The amount of time you can place your Internet connection on hold while taking another call will be up to your Internet Service Provider (ISP).The V.92 recommendation permits ISPs to set their modems to wait for 0 to 16 minutes, or, to wait indefinitely. V.92 client modems may include software that will warn the user when the ISP determined timeout approaches, as well as to display call waiting caller ID info (requires telco call waiting/caller ID service). ISPs have an incentive to limit the use of this feature: when a call is placed on hold, the ISP modem remains unavailable to take other calls. The ISP may need to add more modems to maintain quality of service if this feature is enabled. The ISPs also have the posibility of do not accept modem-on-hold if the total time of modem-on-hold in the same session is greater that a determined value.
• Quick Connect(QC): In the ITU V.92 recommendation the time to establish a connection may be reduced with faster handshaking, using a short phase 1 and phase 2, reducing the connection time to about 20 seconds. It is also possible to reduce more this connedction time to around 10 seconds using short phase 3 and phase 4 (this feature is not in the ITU V.92 recommendatin) by forcing V.92 modems to remember line conditions and connect rates on past connections by storing data about those connections in a buffer. The modem will compare line quality variables as it dials in to a server modem with those in the buffer, and if a match is found, the handshake starts at the rate previously negotiated. Quick Connect will also be used with Modem On Hold: when a call is switched back to the modem after using the MOH feature, a retrain is required. When the V92 modem uses short phase 3 and phase 4 and the line conditions are different, the V.92 modem have to fall-back to a full retrain.

Deliverables

• DSP code
• exe code
• ANSI-C

• see the entire V.92 dial-up modem standard datasheet
• get in contact with V.92 dial-up modem standard Supplier