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ZyXEL modem FAQ List v4.2, Nov 20 1995, Part 4 of 5 [Info / IDSN]

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Archive-name: modems/ZyXEL/FAQ/part4
Last-modified: 1995/04/09
Version: 4.2
Posting-frequency: monthly;the third Monday of every month

See reader questions & answers on this topic! - Help others by sharing your knowledge
                             ZyXEL Modems 
                           Frequently Asked
                            Questions List

                              Version 4.2

                    Archived at: rtfm.mit.edu in 
         /pub/usenet/news.answers/modems/ZyXEL/FAQ/part[1-5]
       
           Please mail any additions to: rwong@direct.ca


=================
Table of Contents
=================

 I.      Information Sources
 I.1     WWW servers know to carry ZyXEL info
 I.2     FTP servers known to carry ZyXEL info
 I.3     Mail servers known to carry ZyXEL info
 I.4     Known mailing lists dealing with ZyXEL modems
 I.5     ZyXEL's CELP compression mode for voice
*I.6     What is V.34, and what speeds are supported?
*I.7     What are the advantages to V.34?
*I.8     How good is V.34?
*I.9     What is the difference between a good V.34 modem and one made
         by Joe?
*I.10    What will happen to the old models?
*I.11    Will ZyXEL implement a subset of V.34 on the 1496 series?
*I.12    What is ZyXEL's upgrade plans for the 1496RN+ modems?
*I.13    Why can not the new V.34 modems do faxing at 28.8 kpbs?
*I.14    What are flash ROMs and how will they work?
*I.15    How will the parallel port on the modems work?
*I.16    What is the benefit of the using the parallel port?
*I.17    Can the second port be used for other purposes?
*I.18    Why is there not an ethernet interface on the modem?
*I.19    What is ISDN?
*I.20    What is required for an ISDN hookup?
*I.21    Why doesn't ZyXEL include the NT1?
*I.22    What are the benefits of ISDN?
*I.23    Can normal analog phone calls be made after the ISDN upgrade?
*I.24    What kind of call processing does ZyXEL support?
*I.25    Is the Euro-ISDN the same as the American-ISDN "modem"?


================================================================================
Subject:  I.  Information Sources
================================================================================

Subject:  I.1     WWW servers known to carry ZyXEL info
--------------------------------------------------------------------------------

http://www.zyxel.com/                   Experimental ZyXEL USA WWW site
                                        Info on new V.34 modems, etc

http://www.comm-data.com/zyxel/         Info on ZyXEL FAQ, etc



Subject: I.2 FTP servers known to carry ZyXEL info -------------------------------------------------------------------------------- ftp.csie.nctu.edu.tw mirror of ZyXEL (Taiwan) BBS Look in /ZyXEL cca.camb.com Mirror of ftp.csie.nctu.edu.tw ftp.zyxel.com OR: ZyXEL USA FTP site ftp.sdsc.edu Look in /pub/other/zyxel Contains latest official roms and software. (Not intended to replace the ZyXEL BBS, which has a much wider array of available files.) ftp.tcl.com.hk TCL Technology FTP site Look in /pub/TCL/ZyXEL grind.isca.uiowa.edu Look in /info/ZyXEL iacrs1.unibe.ch Look in /pub/ZyXEL another mirror of ZyXEL, Taiwan ftp.cd.chalmers.se Look in /pub/zyxel Same info as above sites, with more files from ZyXEL, USA BBS and more voicemail programs ftp.luth.se ROM images, files, info, etc. Look in /pub/misc/zyxel ftp.cs.psu.edu Look in /pub/fenner/ZyXEL Owner says: odd tibits, etc. Usually no ROM images. ftp.twi.tudelft.nl Look in /pub/ZyXEL Eprom images, zfax, FAQ and other goodies kaiwan.com Look in /pub/ZyXEL.US.bbs.mirror Contains files from ZyXEL BBS sgi.com Look in /sgi/modems Contains file called: fix-zyxel (mirrored on wuarchive.wustl.edu) Replacement files for /usr/lib/uucp and /etc (gettydefs) to use ZyXELs Look in /sgi/fax Contains FlexFAX software shape.mps.ohio-state.edu Look in pub/netfax-zyxel Contains netfax patches for ZyXELs sparco.com Look in /pub/sparco Contains pricing and order info for Sparco, a ZyXEL mail-order vendor 129.26.9.88 (name unknown) Look in /usr/pub/zyxel/ibm/jhb Contains beta version of PD voicemail program for PC Germany: dsrbg2.informatik.tu-muenchen.de Look in /physik/ZyXEL Contents similar to ftp.luth.se faramir.informatik.uni-oldenburg.de Look in /pub/amiga/incoming/zyxel pretty much a mirror of ROM images, etc. quepasa.cs.tu-berlin.de Look in /pub/atari/modem File called: zyxelinf.lzh ftp.rrzn.uni-hannover.de Look in /pub/special/zyxel ftp.uni-stuttgart.de Look in /pub/systems/pc/comm/zyxel sun.rz.tu-clausthal.de Look in /pub/atari/telecomm File called: zyxelinf.lzh vax.ph-cip.uni-koeln.de Look in /pub/amiga/comm/zyxel Contains amiga-soft for ZyXELs and newest ZyXEL-ROMs Amiga FTP (AmiNet) sites: ************************* Australia splat.aarnet.edu.au 192.107.107.6 (*) (*) closed 6:30am to 4pm weekdays Germany ftp.uni-kl.de 131.246.9.95 ftp.uni-erlangen.de 131.188.1.43 ftp.cs.tu-berlin.de 130.149.17.7 ftp.th-darmstadt.de 130.83.55.75 ftp.uni-paderborn.de 131.234.2.32 Switzerland litamiga.epfl.ch 128.178.151.32 Scandinavia ftp.luth.se 130.240.16.3 USA ftp.wustl.edu 128.252.135.4 merlin.etsu.edu 192.43.199.20 wcarchive.cdrom.com 192.153.46.2
Subject: I.3 Mail servers known to carry ZyXEL info -------------------------------------------------------------------------------- questor.org send mail to 'mail-server@questor.org' with a body of 'HELP' to get instructions
Subject: I.4 Known mailing lists dealing with ZyXEL modems -------------------------------------------------------------------------------- zyxel-programmers@sfu.ca Please send all subscription/cancellation requests to owner-zyxel-programmers@sfu.ca mgetty@greenie.muc.de Please send all subscription/cancellation requests to mgetty-request@greenie.muc.de
Subject: I.5 ZyXEL's CELP compression mode for voice -------------------------------------------------------------------------------- CELP compression is currently available only on Plus model modems. The implementation of CELP in the ZyXEL plus model modems is proprietary. As such, ZyXEL has not published any information regarding the manual decoding/ encoding using this method. ZyXEL also will not confirm nor deny any sources of information that will will further elucidate the CELP decoding/ encoding algorithms. A listing of all the US Federal Standard 1016 sources is available by sending e-mail to Robert Wong (rwong@direct.ca). The numerous pages of USFS descriptions do not help in decoding ZyXEL's CELP. They may help to understand what ZyXEL's CELP C code basically does. The USFS 1016 descriptions are nice to learn about what CELP *could* do ;-) For further understanding of CELP, it needs a real mathematician and deeper knowledge of voice processing theories.)
Subject: I.6 What is V.34, and what speeds are supported? -------------------------------------------------------------------------------- V.34 is a ITU-T (International Telecommunication Union - Telecommunication standards group) recommendation for 28.8 kbps asynchronous data communication. V.34 supports 28.8 kbps as the fastest speed. V.34 will also support fallback speeds (in 2400 bps decrements) down to 2400 bps. Thus V.34 will run at 28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12.2K, 9600, 7200, 4800, 2400 bps.
Subject: I.7 What are the advantages to V.34? -------------------------------------------------------------------------------- Speed! V.34 is a *standard*, ITU-T protocol that specifies a transmission speed of up to 28.8 kbps. The previous standard speed was V.32bis, transmitting at 14.4 kbps. Lawrence Kirby (fred@genesis.demon.co.uk) writes: In theory, V.34 could support 14.4 kpbs on lines that V.32bis could not and where V.32bis would have to drop down to lower speeds. In practice this is a quality of implementation issue which may not be present in current products.
Subject: I.8 How good is V.34? -------------------------------------------------------------------------------- an171@FreeNet.Carleton.CA (Anthony Hill) writes" Well first of all if you're getting a 14.4 connection between two v.34 connections, the chances of you ever getting a 14.4 connection between two v.32bis connections are next to nill since v.34 is so much better at handling poor lines (I get 28.8/28.8 or 28.8/26.4 connects most of teh time on what are fairly average lines for North America). Also v.34 is asymetrical, meaning you can have the protocol talking faster in one direction then in the other direction, so you might end up with a 14.4/16.8 connections where as with v.32bis you'd only have a 14.4 connection (well actualy you'd rpobably have a 7200 or 9600 connection, if any at all). Basicaly v.34 is better then any other ITU-T protocol in pretty much every way. Of course a v.34 modem connecting to a v.32bis modem will provide no advantage over a v.32bis modem connecting to another v.32bis modem as modems must can only use the highest common protocol.
Subject: I.9 What is the difference between a good V.34 modem and one made by Joe? -------------------------------------------------------------------------------- V.34 has a collection of implementation options which will affect the eventual performance of the modem. Some options to look for in a product are asymmetrical transmission, auxiliary channel, lower speed baud rates, nonlinear encoding, precoding, trellis states, etc. Good quality modems will have implemented more of the V.34 options. [Hopefully they would have also done a *GOOD* job in the implementation.] Data Communicatons magazine, Nov 1994, pg 99-108 is a good reference to these options and their impact on interoperativity and performance. Two good V.34 modems are more likely outperform two Joe Average modems. The enhanced performance will be noticeable on lousy lines, and may be noticeable on good lines. This also means that a good V.34 modem connecting with the "Joe" modem will not notice any performance benefits.
Subject: I.10 What will happen to the old models? -------------------------------------------------------------------------------- They will still be sold. Kolja Waschk (kawk@Yo.COM) writes: ZyXEL said they'd implement whatever [subset of V.34] is possible on the U1496, and they won't stop support and firmware development for the U1496 series in the future.
Subject: I.11 Will ZyXEL implement a subset of V.34 on the 1496 series? -------------------------------------------------------------------------------- Kolja Waschk (kawk@Yo.COM) writes: As far as I know, it is IMPOSSIBLE to handle any v.34 'subset' with the U1496 hardware. v.34 needs more processing power even for the lower speeds than other 19k2 methods like ZyXEL's own 19k2 and v32.terbo; more than the U1496 series offer. Correct me if I'm wrong.
Subject: I.12 What is ZyXEL's upgrade plans for the 1496RN+ modems? -------------------------------------------------------------------------------- That will depend upon whether or not the new board can fit (physically) into the existing chassis. Officially, there has not been a decision as far as upgrade path for the rack mounts. The LED model will come out first, then the LCD, and then rack.
Subject: I.13 Why can not the new V.34 modems do faxing at 28.8 kpbs? -------------------------------------------------------------------------------- Currently there is no ITU-T standard for faxing at 28.8 kbps. When this standard exists, ZyXEL will implement faxing at 28.8 kbps.
Subject: I.14 What are flash ROMs and how will they work? -------------------------------------------------------------------------------- The current U-1496 generation of ZyXEL modems update ROM versions via a ROM *replacement*. This involves opening the modem, removing the ROM chips, and inserting the new chips. The new ZyXEL modems will have flash ROMs to facilitate ROM updates. Users will get a new copy of the ROM images, and run a program in DOS or in MacOS. The new ROM images are sent to the modem, and the new images are "flashed"/ written to the flash ROM chips. This method of ROM updates should be much easier to perform. brentm@zyxel.com (Brent Mosbrook) writes: The [flash] chips are rated at 100,000 flashes..
Subject: I.15 How will the parallel port on the modems work? -------------------------------------------------------------------------------- The new ZyXEL Elite modems have a parallel printer port on them. An Elite can be hooked up directly to a HP Deskjet/LaserJet/PCL-based printer. The Elite will then send all incoming faxes to the printer. In effect, the printer will become an incoming-only plain paper fax machine. The computer is thus bypassed, thereby removing the usual requirement for the computer to be turned on (to receive faxes). When the optional 2/4/8 Mb of RAM is installed, incoming faxes can be stored in the modem itself. The stored faxes can then be sent to the PC for futher processing. The modem will work on HP LaserJets and other PCL-based printers. Postscript printers are not *currently* supported (stay tuned!).
Subject: I.16 What is the benefit of the using the parallel port? -------------------------------------------------------------------------------- Joe Gray (jgray@onramp.net) wrote: : Brent, what kind of speed difference can I expect between the serial port : at 115K (assume 16550 UARTs) and the parallel port? I know that : theoretically the parallel should be faster, but what about in real life? brentm@zyxel.com (Brent Mosbrook) writes: The speed is not the most important factor.. reliability and reduced CPU load are the primary reasons to run the parallel driver.
Subject: I.17 Can the second port be used for other purposes? -------------------------------------------------------------------------------- Only one port can be used on the new modems. Users *cannot* use the other port for diagnostic, statistic, or call progress reporting purposes.
Subject: I.18 Why is there not an ethernet interface on the modem? -------------------------------------------------------------------------------- Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] writes: We're looking into providing an ethernet interface. I don't have details as to which product, nor when it will be available though. As soon as concrete info is available, I'll post.
Subject: I.19 What is ISDN? -------------------------------------------------------------------------------- Modems (MOdulators and DEModulators) take data from the computer and modulates the data into sounds for transmission over the phone line. The modem on the receiving computer demodulates the sounds into data, which is then send to the connected computer. The modulation and demodulation process is inefficient. A better way to transmit the data is to avoid the mod/demodulation process. Use digital lines, and send the data digitally -- essentially, this is the purpose of ISDN. ISDN (Integrated Services Digital Network) is an additional *paid* service from the telephone company. It is a high bandwidth technology that allows users to send large amounts of information in short amounts of time. While V.34 can send data at 28.8 kbps, ISDN can send data at 128 kpbs. Basic Rate Service (BRS) ISDN, or 2B+D is composed of two 64 kbit/s digital channels and one 16 kbit/s control channel.
Subject: I.20 What is required for an ISDN hookup? -------------------------------------------------------------------------------- Buy a ZyXEL modem that is ISDN equipped, or buy the ISDN upgrade module for the new ZyXEL modem. Get an ISDN line wired to premises. Subscribe to BRI ISDN. Buy a a NT1 adapter (U interface). Plug the modem into the NT1 adapter and plug the NT1 into the ISDN connection. The ZyXEL modem (technically no longer a MODulator/DEModulator) is now connected via ISDN.
Subject: I.21 Why doesn't ZyXEL include the NT1? -------------------------------------------------------------------------------- Not all countries implement ISDN the same way. Some are given the NT1 by the telco.
Subject: I.22 What are the benefits of ISDN? -------------------------------------------------------------------------------- Speed and flexibility. Kari Tiihonen (kari.tiihonen@pcb.mpoli.fi) writes: Nobody has yet talked about the speed of ISDN. It's ideal for remote operations with it's V.42bis capability - you'll reach 30,00 cps if your DTE can handle it. Zipped files will move around 15, 000 cps. Nice? ISDN allows the following connection possibilities: 1. 1B - ISDN (64k) 2. 2B - ISDN (128k) 3. 1B - ISDN (64k) 1B - External Analog device (phone, fax, modem) 4. 1B - V.34 over ISDN (to a remote analog device) up to V.34 speeds 5. 1B - V.34 over ISDN (to a remote analog device) up to V.34 speeds 1B - External Analog device (phone, fax, modem) In scenario 5, users can use one B channel to maintain an ISDN connection. SIMULTANEOUSLY, users can either talk/fax/modem/voicemail on the other B channel. <Editor's note: "Awesome eh!">
Subject: I.23 Can normal analog phone calls be made after the ISDN upgrade? -------------------------------------------------------------------------------- Yes. Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] writes: "If you have the ISDN module, you can still do V.34 links. The ISDN module allows you to simulate an analog line, so you can still connect to any other V.34 modem that has a POTS line. IF you want to plug the ISDN-interface equipped modem into a real POTS line, then you would have to open the modem, remove the ISDN module, and replace it with the analog module. This is probably only an issue for folks who take their modems with them on trips and such.. The whole point of the ISDN module is to give you the flexibility to connect to EITHER type of remote device."
Subject: I.24 What kind of call processing does ZyXEL support? -------------------------------------------------------------------------------- Computer telephony can be defined as computers and telephones working together. The computer will control perform the "call control/processing" tasks such as dialling, answering, transferring, and conferencing of the phone line. Currently, there are more than a few "standards" for call processing. These standards include the AT&T/Novell Telephone Services Application Programming Interface (TSAPI), the Microsoft/Intel Telephony Application Programming Interface (TAPI), the Macintosh Telephony Architecture (MTA), etc. A true "standard" will emerge in due time. [Ed.: Hopefully this new FAQ entry is factually correct.] Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] writes: We haven't announced support for TSAPI (Novell) yet, but as the article mentioned, we will be supporting TAPI (Microsoft).
Subject: I.25 Is the Euro-ISDN the same as the American-ISDN "modem"? -------------------------------------------------------------------------------- There are hardware differences between the two "modems". Thus an ISDN "modem" purchased in the Americas will not be Euro-ISDN compatible. ================================================================================ -- Robert Wong Jr. 1921 East 61st Avenue, Vancouver, B.C., Canada, V5P 2K2, (604) 322-6918 rwong@direct.ca or wrob@unixg.ubc.ca Keeper of the ZyXEL FAQ and Head of the UBC-NeXT Users Group Standard disclaimers apply.

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