ZyXEL Communications U-1496 series Bedienungsanleitung

ZyXEL

U-1496 Series Modems

User’s Manual

Chapter One - INTRODUCTION

THE U-1496 SERIES UNIVERSAL MODEMS

The U-1496 series of high-speed modems feature five base models.

They are:

U-1496

External stand alone model with 20 x 2 LCD display and menu

control.

Also called U-1496S. Includes 2/4-wire leased line support.

U-1496E

External stand alone model with LED status indicators. 2-wire

application only.

U-1496B

PC internal card version.

U-1496R

Rack mount modem card version. Up to 16

U-1496Rs can be housed in

a RS-1600 rack with central panel control and 20 x 4 LCD display.

U-1496P

A portable model, particularly suitable for cellular data

communications.

There are also models with a plus (+) suffix, such as U-1496E+,

U-1496R+, and U-1496B+. These plus versions have a faster

processor and more memory space to support the ZyXEL 19200 bps

high-speed mode, advanced voice capability, and future updates

with more enhanced features.

The basic features, functions, and operation of the plus versions

are the same as those of the normal version. We do not

specifically mention the plus version in this manual unless there

are functional or operational differences. The U-1496 LCD model

is always a plus version.

HOW TO USE THIS MANUAL

This manual describes the use of all models in the U-1496 series,

the U-1496, U-1496E, U-1496B, U-1496P, and U-1496R. Usually, this

manual describes the operation of the U-1496, the model with the

largest set of functions. If a description does not apply to a

certain model, you may skip the description.

The manual is structured into roughly 5 sections.

The first section comprises chapters 1 through 3. It gives a

basic overview of the U-1496 series modems' features, introduces

some basics of modem operation for novice users, and explains the

installation of the different models of the U-1496 series

including the U-1496B PC-card. Please note that the COM port and

interrupt number must be properly chosen, before the U-1496B can

be installed.

The panel operation of the U-1496 is described in Chapter 4 and

5. The U-1496 has an LCD display menu control panel. The rack

system has a central menu control panel similar to that of the

U-1496. Users of the other models should consult the equivalent

AT command sections listed for each of the panel operations.

The third section, chapters 6 through 8, provides an overview

of the settings and commands which are available in the U-1496

series.

Section four comprises chapters 9 through 17 and describes many

special functions of the U-1496 series modems in detail,

including data compression, synchronous and lease line operation,

remote configuration, caller ID, cellular mode, fax send and

receive, voice mail, network management, and diagnostic features.

Section five is the trouble-shooting and special advice section.

Here you find additional information on how to use a U-1496

series modem with your computer, and some hints and tips

relating to a number of communication software applications.

A glossary, several appendices with technical details and

information on standards, and a thorough index complete this

manual.

The RS-1600 rack system comes with a supplemental User's Guide

describing the use and installation of the rack system. The

Network Management System comes with a separate manual detailing

its installation and usage.

Compatibility

ZyXEL U-1496 series modems are high performance universal

modems capable of transmission speeds up to 19.2 Kbps full-duplex

on a 2-wire dial-up line. Universal compatibility covers a broad

range of CCITT and BELL standards, and provides data compression

and error free transmission.

Various operation modes that can be achieved are as follows:

Bit rate Baud rate Modulation Carrier

(+/-0.01%) (+/-0.01%) Freq

bps baud Hz

ZyX19200 19,200 2743 256TCM 1800

ZyX16800 16,800 2400 256TCM 1800

V.33 14,400 2400 128-TCM 1800

V.33 12,000 2400 64-TCM 1800

V.32bis 14,400 2400 128-TCM 1800

V.32bis 12,000 2400 64-TCM 1800

V.32bis 7,200 2400 16-TCM 1800

V.32 9,600 2400 32-TCM 1800

V.32 uncoded 9,600 2400 16-QAM 1800

V.32 4,800 2400 4-DPSK 1800

V.29 9,600 2400 16-QAM 1700

V.29 7,200 2400 8-QAM 1700

V.29 4,800 2400 4-DPSK 1700

V.27ter 4800 1600 8-PSK 1800

V.27ter 2400 1200 4-DPSK 1800

V.23 1200/75 1200/75 FSK

V.23 600/75 600/75 FSK

V.22bis 2,400 600 16-QAM 1200 Orig. 2400 Ans.

V.22 (BELL 212A) 1,200 600 4-DPSK 1200 Orig. 2400 Ans.

V.21 300 300 FSK

BELL 103 300 300 FSK

G3 Fax implemented according to T.30, V.17,V.29 and V.27ter.

Cellular Modes ZyXEL proprietary cellular modes, 14400 bps to

2400 bps speed range.

1800 Hz guard tone for V.22bis/V.22 answer mode, 6 dB below

data signal level.

Note: V.33, V.29, V.27bis, V.27ter and V.26bis are only available in

models U-1496 and U-1496R for 4-wire leased line operation. The

other operation modes are common to all models.

THE U-1496 SERIES STANDARD FEATURES

Synchronous/Asynchronous operations for external stand alone

models and rack mount model.

Asynchronous operations for PC internal card model.

MNP class 4/5 error correction/data compression.

V.42/V.42bis error correction/data compression. V.42 with

selective reject feature.

Extended AT command set.

V.25bis async/sync command set.

Operate on 2-wire dial-up line or 2/4-wire leased line. (4-wire

leased line on U-1496 and U-1496R only.)

Auto-dial/answer and manual originate/answer.

Tone/Pulse dialing.

Dial tone, busy, and ringback detection.

Programmable speaker volume control.

Non-volatile memory storage.

Remote configuration.

Security call back.

Caller ID detection.

Distinctive ring detection.

Extensive Status reports.

Diagnostics available for:

Modem full self test

Analog loopback (w/ self test)

Remote digital loopback (w/ self test)

Digital loopback

XON/XOFF or CTS/RTS flow control.

Line status monitoring available for: (U-1496 and U-1496R)

Signal-to-noise ratio

Receive signal level

Frequency offset

Phase jitter

Retrain granted

Retrain requested

Round trip echo delay

Carrier loss counter

Rate change granted

Rate change requested

Blocks retransmitted

Blocks in error

20 X 2 LCD display and directional keypads. (On U-1496 model

only, 20 x 4 on rack panel.)

G3 Fax send and receive capability with speeds up to 14400 bps.

Fax-Polling / Fax-Grouping.

Automatic detection of data or fax call.

Digitized voice capability with speech compression.

Special cellular modes for data communications through cellular

link.

Full two-year warranty.

BEFORE YOU GET STARTED

Before you proceed further, please check to see if you have all

the necessary materials from the shipping package and make sure

nothing is missing. The complete package should include:

one (1) U-1496 series universal modem

one (1) power adapter pack (stand alone model only)

one (1) RJ11 telephone cable

one (1) JM8 leased line cable (U-1496 only)

one (1) U-1496 series user's manual

one (1) ZFAX 3.5" floppy disk

one (1) warranty/registration card

one (1) Quick Reference card

Contact your dealer or the store where you bought the modem if

anything is missing. After you unpack the modem,

please check for shipping damages. If you find any damage,

contact the shipping agency immediately.

Please retain the shipping carton and cushioning materials for

future storage or shipping needs.

Please direct any additional questions about damaged or missing

materials to your dealer or distributor or to factory with

address listed on your warranty card.

HOW TO BECOME A REGISTERED OWNER

Simply fill in the registration card and mail it to the address

found on the reverse side of the card. Registered owners will

receive future product and update information. You don't have to

purchase along with the warranty card are sufficient.

WHAT YOU NEED TO HAVE

You need the following equipment to operate your modem:

Computer/Terminal with communication software (e.g,. PC with

Windows Terminal).

RS-232 serial cable (not supplied with modem).

Note: If you bought the internal PC card, you don't need a serial

cable.

A telephone line from your telephone company (dial-up or leased

line).

COMMUNICATION SOFTWARE

Communication software controls the modem connected to the

computer and directs data to and from the modem. For most cases

in the PC environment, the modem is used in an asynchronous mode

and the software controls the modem by the AT commands. ZyXEL

modems support the extended AT command set and are compatible

with most communication software packages. However, there are

some unique features in the ZyXEL modem and there are a few

unique commands to control them. Some communication packages

need a "modem data file" to tell it which commands and features

the modem supports. The floppy disk included with your modem

package features sample data files for some popular communication

software packages.

CONNECTING TO YOUR PHONE

If you would like to use a single phone line for voice and

modem connections, remove your phone cable from the RJ11 junction

box and plug one end of the RJ11 cable (supplied with modem) into

the socket on the phone, then plug the other end of the cable to

the rear panel of the modem labeled "DIAL-UP LINE" or "WALL".

Finish by plugging in your phone cable to the rear panel of the

modem labeled "PHONE". Please refer to the illustration in Fig.

3-3.

DIAL-UP OR LEASED LINE

The U-1496E and U-1496B can connect to 2-wire dial-up or leased

lines only. The U-1496 and U-1496R offer you a choice of

connecting to 2-wire dial-up line (more commonly known as public

lines) and 2/4-wire leased lines. To use the U-1496 on a leased

line, you must order and install a USOC JM8 jack. You must also

specify 4-wire operation without TEK leads for the wiring option.

When setting up a pair of modems for leased line point-to-point

operation, one must be configured for originate mode and the

other for answer mode. Both RJ11C and JM8 cables are supplied for

your convenience.

Chapter Two - MODEM AND FAX BASICS

This chapter is intended for those who want to know the details behind modem and fax

operations; what's going on behind the scenes. In addition to basic modem and fax terminology,

this chapter helps users understand and use the available features. Experienced modem and

fax users may wish to skip this chapter.

WHAT IS A MODEM

Modem is a compound word of MOdulator and DEModulator. A modem is

used for computer communications. Refer to Fig. 2.1 for a

standard modem setup and application. A modem translates computer

data to analog signals (modulation) that can travel through the

telephone network and reach the other modem. The remote modem

translates the analog signal received back into data

(demodulation) and sends the information to the receiving end

computer. Modems are telephones for computers, what

they use to talk to each other.

((*MODE-02*; Modem as used in computer communications))

WHAT ARE DTE AND DCE

DTE and DCE are terminologies used in data communication. DTE stands for Data Terminal

Equipment and DCE stands for Data Circuit terminating Equipment (Data Communication

Equipment). Referring to Fig. 2.1, the computer or terminal is the DTE and the modem is the

DCE.

WHAT IS RS-232C OR EIA-232D

RS-232C is the Recommended Standard (RS) by the Electronic

Industries Association (EIA) defining the serial communication

interface between a DTE and a DCE. The most commonly used

revision is the "C" revision. For "D" revision, it changes the

prefix to EIA. Except for a few added, but not commonly used

signals, there is no practical difference between the "C" and "D"

revisions. RS-232C is equivalent to CCITT V.24 and V.28.

WHAT IS A SERIAL PORT

A serial port is the serial data connector together with its

internal circuit on the DTE or DCE with electrical and mechanical

characteristics according to RS-232C. Since some signals are

going from the DTE port to DCE port, and some signals are going

in the other direction, the signal pin is a transmitter on one

port and a receiver on the other. The DTE serial port is

different from the DCE serial port in terms of signals on the

connector pins. There are also mechanical differences in terms of

male or female connectors.

SERIAL RS-232C CABLE

A serial RS-232C cable is used to connect a DTE port to a DCE

port. A normal RS-232C connector has 25 pins and a normal RS-232C

cable has 25 wires. Many signals in the RS-232C are not used in

common applications and a 9-wire RS-232C cable is sufficient in

most applications. The PC-AT's serial port has only 9 connector

pins, eliminating the unnecessary pins.

SYNCHRONOUS AND ASYNCHRONOUS COMMUNICATION

There are two kinds of serial data communication. One is called

synchronous and the other is called asynchronous. In synchronous

communication, data is transmitted and received bit by bit and is

timed by an accompanying clock signal. In asynchronous

communication, data is sent character by character (or octet by

octet), the idle time between characters is variable. No clock

signal is sent; character timing is recovered from the data

itself.

A PC's COM1 and COM2 are asynchronous serial ports. Most PCs' and

Unix systems' serial data communications are asynchronous. The

serial data communication on an IBM mainframe or mini is

synchronous.

WHAT IS UART

UART (Universal Asynchronous Receiver Transmitter) is the device

used in a DTE or DCE for asynchronous data reception and

transmission. The normal UART device used in PCs is of the

NS16450 type. For high-speed serial data receiving (38400 bps and

up), the PC may not serve the UART fast enough and data may get

lost. In this case, a UART with data buffer is needed, such as

the NS16550A type.

MODEM STANDARDS AND SPEEDS

The CCITT (Comite International Telegraphique et Telephonique, now called

ITU-TSS (International Telecommunications Union - Technical Standardization Sector), is the

international standard-making body for telecommunication. They draft "recommendations". The

recommendations they made for modem applications have a "V" prefix and are called V-series

recommendations. The commonly used CCITT standards for 2-wire dial-up line are:

V.32bis 14400/12000/7200 bps

V.32 9600/4800 bps

V.22bis 2400 bps

V.22 1200 bps

V.21 300 bps

V.23 1200/75 bps

Note: bis is the French word for second.

In the USA, Bell Systems used to create the de facto standard

such as Bell 212A for 1200 bps modems and Bell 103 for 300 bps

modems. Everyone is following the CCITT standard now for newer

and higher speed modems.

ZyXEL U-1496 series modems support all the above mentioned modem

standards and are compatible with existing modems.

TYPE OF TELEPHONE LINE

The commonly used phone service is a 2-wire dial-up line. Only

two wires connect the modem to the phone company's central

office. The same two wires are used for DC current feeding,

ringing, dialing, on/off-hook monitoring, and signal transmission

in both directions. This is the type of phone service most people

have in their home or office. Since the same two wires are used

for both transmitting and receiving signals, an echo of the

transmitting signal will also be received and it is the modem

receiver's task to remove the echo before demodulation.

A leased-line phone service is also available from phone companies in a 4-wire form. Here the

transmitting and receiving signal each uses a separate 2-wire pair and thus no echo problem will

result. Normally, no DC current feeding, ringing, or dialing function is provided on a leased line.

There is also the case of a 2-wire leased line which is a

permanent 2-wire connection.

INTELLIGENT MODEM

In the old days, modem functions, settings, and operations were

simple and everything was controlled by manual switches, either

internal or external, or by wire-strapping settings. No computer

control was provided.

An intelligent modem has all its functions, including dialing and

answering, controllable by the computer or terminal it is

connected to, through the same RS-232 serial interface used for

data connection.

An intelligent modem operates in one of two states - the command

state and the data state. In command state, the modem interprets

data received from the serial interface as "commands" and send

back an action result in response. In data state, the modem

modulates the data received from the serial interface and sends

the demodulated data to the serial interface as received data.

The user needs to know whether the modem is in the command state

or data state and how to switch it.

AT COMMAND SET

The AT command set is the industry de facto standard used to

control a modem in command state. It got its name from the fact

that every command line has a prefix "AT".

AT commands were first used in the Hayes Smartmodem (R) and hence

adopted by other modem manufacturers and communication software

writers. The original set of AT commands such as dialing,

answering, etc., is used by everyone else and is standardized.

The AT command set is extended by each modem manufacturer for

control of ever-increasing modem functions and capabilities. This

"extended" or "enhanced" command set is not standardized

whatsoever.

The AT command set is used only with an asynchronous serial data

interface.

ZyXEL has defined a set of extended AT commands to support many

of its unique functions and features.

V.25bis COMMAND SET

V.25bis is a set of auto-dialing commands defined by the CCITT.

V.25bis supports both synchronous and asynchronous data

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