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01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

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第2第 System Description 第3第 HUAWEI ETS1000 Series Fixed Wireless Terminal 第4第 Table of Contents 第5第 Table of Contents 第1第 Chapter 1 Overview.........................................1-1 第2第 Chapter 2 Features.........................................2-1 第3第 2.1 Main Features.......................................2-1 第4第 2.2 Main Services.......................................2-2 第5第 2.3 Main Specifications.................................2-2 第6第 2.4 Main Performances...................................2-3 第7第 Chapter 3 System Architecture..............................3-1 第8第 3.1 Appearance..........................................3-1 第9第 3.2 Technical Parameters................................3-1 第10第 3.3 External Interface Description....................3-2 第11第 Chapter 4 Service and Application........................4-1 第12第 4.1 Common Voice Application..........................4-1 第13第 4.2 Attended Public Telephone Application.............4-1 第14第 4.3 Wide coverage Application.........................4-2 第15第 4.4 Data Service Application..........................4-3 第16第 4.5 Fax Application...................................4-4 第1第 i
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Page 1: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第2 章 System Description

第3 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第4章 Table of Contents

第5 章

Table of Contents

第1 章 Chapter 1 Overview.........................................................................................1-1

第2 章 Chapter 2 Features.........................................................................................2-1

第3 章 2.1 Main Features..................................................................................2-1

第4 章 2.2 Main Services..................................................................................2-2

第5 章 2.3 Main Specifications...........................................................................2-2

第6 章 2.4 Main Performances...........................................................................2-3

第7 章 Chapter 3 System Architecture...................................................................3-1

第8 章 3.1 Appearance.....................................................................................3-1

第9 章 3.2 Technical Parameters.......................................................................3-1

第10 章 3.3 External Interface Description.....................................................3-2

第11 章 Chapter 4 Service and Application............................................................4-1

第12 章 4.1 Common Voice Application.........................................................4-1

第13 章 4.2 Attended Public Telephone Application.......................................4-1

第14 章 4.3 Wide coverage Application............................................................4-2

第15 章 4.4 Data Service Application............................................................4-3

第16 章 4.5 Fax Application..............................................................................4-4

第1章 i

Page 2: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第2 章 System Description

第3 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第4章 Table of Contents

第5 章第17 章 Chapter 5 Purchase Guidance...................................................................5-1

第18 章 5.1 Host Purchase..............................................................................5-1

第19 章 5.2 Antenna Feeder System Purchase..............................................5-1

第20 章 5.2.1 Antenna Feeder System Purchase Reference.................5-1

第21 章 5.2.2 Purchase List for Antenna Feeder System.........................5-2

第22 章 5.3 Purchase of Terminals Supporting Fax Function.........................5-2

第23 章 5.4 Select of Product Features............................................................5-3

第24 章 5.5 Purchase of Optional Fittings.........................................................5-3

第25 章 5.5.1 Purchase Reference of Optional Fittings............................5-3

第26 章 5.5.2 Purchase List for Optional Fittings.......................................5-4

第27 章 Chapter 6 Acronyms.....................................................................................6-1

第1章 ii

Page 3: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第7 章 System Description

第8 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第9章 Chapter 1 Overview

第10 章

Chapter 1 Overview

Based on the IS-2000 protocol and CDMA technology, HUAWEI ETS1000 Series

Fixed Wireless Terminals have the following features:

Clear conversation, low call drop, high secrecy, low radiation, environmental

health, etc.

In remote areas of sparse population, compared with the cable access system,

the wireless access system only needs less investment so that network

operators can take back their cost in shorter time.

HUAWEI ETS1000 Series Fixed Wireless Terminals support multiple

interfaces, through which users can connect external devices with the terminal,

thus providing subscribers with high-quality voice service, high-speed packet

data service, circuit data service, digital fax, G3 analog fax, wireless public

telephone service, etc. Such rich service functions not only meet the demands

of subscribers, but also effectively increase the ARPU of operators.

HUAWEI ETS1000 Series Fixed Wireless Terminals are easy and flexible to

install, so they are applicable to the areas where a cable access system has

difficulty in configuration or variable locations. For example, you can easily add

office telephones in various temporary locations (such as large building site,

large sports match and emergency and crisis dealing sites), or assemble them

on mobile cars or ships for use as business or private telephones.

At present, HUAWEI ETS1000 Series Fixed Wireless Terminals involves three

series and six models of products. Table 1-1 describes the three series and

corresponding models.

Table 1-1 Series and models of HUAWEI ETS1000 Series Fixed Wireless Terminals

Series Model Description

ETS1000(450MHz)

Series

ETS1000/

ETS1001

ETS1000/ETS1001 operates at 450MHz band.

ETS1000 does not support G3 analog fax function,

while ETS1001supports it besides any other

functions of ETS1000.

ETS1200(800MHz)

Series

ETS1200/

ETS1201

ETS1200/ETS1201 operates at 800MHz band.

ETS1201 supports analog fax function, while

ETS1200 does not.

第6章 1

Page 4: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第7 章 System Description

第8 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第9章 Chapter 1 Overview

第10 章

ETS1500(1900MHz

) Series

ETS1500/

ETS1501

ETS1500/ETS1501 operates at 1900MHz band.

ETS1501 supports G3 analog fax function, while

ETS1500 does not.

第6章 2

Page 5: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第12 章 System Description

第13 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第14 章 Chapter 2 Features

第15 章

Chapter 2 Features

2.1 Main Features

Wide coverage

HUAWEI ETS1000 Series Wireless Terminals are equipped with standard TNC

antenna interfaces, through which an outdoor/indoor antenna can be connected

with the terminal. In remote or poor-signal-quality areas, you can choose an

outdoor antenna to improve the coverage of the terminal. Especially, ETS1000

(450MHz) Series terminals operate at 450MHz, so they provide more wide

coverage.

High-quality voice

HUAWEI ETS1000 Series Wireless Terminals adopt highly-effective voice codec

technologies (such as 8k EVRC and 8k/13k QCELP) to provide the high-quality

voice access.

High-availability data services

HUAWEI ETS1000 Series Wireless Terminals can provide packet data services

with a maximum rate of 153.6kbps/38.4kbps (Downlink/Uplink) and circuit data

services with a maximum rate of 14.4kbps.

High-availability fax services

HUAWEI ETS1000 Series Wireless Terminals support PC digital fax services. In

addition, ETS1001/ ETS1201/ETS1501 terminals support G3 analog fax services.

Wireless public telephone services

HUAWEI ETS1000 Series Wireless Terminals offer charging interfaces, through

which a charging meter can be connected with the terminal to implement the

attended public telephone service. At present, the terminals support three charging

interface standards: polarity reversal, 12KC and 16KC.

Rich interfaces

HUAWEI ETS1000 Series Wireless Terminals offer two RJ11 interfaces in parallel,

through which you can connect a telephone, fax machine or charging meter. The

terminals offer one serial data interface to support packet data services and circuit

data services, and this interface can also be used for the normal maintenance and

第11章 1

Page 6: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第12 章 System Description

第13 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第14 章 Chapter 2 Features

第15 章software version upgrade of the terminal. In addition, the terminals offer a standard

TNC interface, through which an outdoor/indoor antenna can be connected.

Easy maintenance

HUAWEI ETS1000 Series Wireless Terminals provide a maintenance tool. You can

flexibly configure equipment parameters through the serial data interface on the

terminal.

2.2 Main Services

HUAWEI ETS1000 Series Wireless Terminals provide the following services:

High-quality voice service, supporting 8k EVRC and 8k/13k QCELP voice

codec technology.

Supporting emergency call service.

Supporting multiple supplementary services: calling number identification

presentation, call transfer, call forwarding, call waiting, call hold and three-way

services.

Supporting packet data service, maximum transfer rate is 153.6kbps/38.4kbps

(Downlink/Uplink).

Supporting circuit data service, maximum transfer rate is 14.4kbps.

Supporting PC digital fax function.

Supporting G3 analog fax function (applicable only for ETS1001/

ETS1201/ETS1501).

Providing charging interface (polarity reversal/12KC/16KC), through which a

charging meter can be connected with the terminal to implement the attended

wireless public telephone service.

2.3 Main Specifications

HUAWEI ETS1000 Series Wireless Terminals support the following functions:

Supporting global settings of subscriber line interface parameters such as dial

tone, busy tone, ringback tone and ringing tone.

Supporting calling number identification presentation function set by DTMF and

FSK.

Supporting volume adjustment function by an external telephone keypad.

Providing echo cancellation and noise suppression functions.

Providing intuitive field intensity indication function and power supply status

indication function.

第11章 2

Page 7: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第12 章 System Description

第13 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第14 章 Chapter 2 Features

第15 章 Providing a spare battery, when the battery capacity is insufficient and AC

power supply is in use, the system can automatically charge the battery.

Providing DTMF secondary dialing function.

Providing UIM interface and support ROM-SIM (terminal and card integrated)

and R-UIM (terminal and card separated).

2.4 Main Performances

HUAWEI ETS1000 Series Wireless Terminals include the following performances:

Operating frequency band

Table 1-2 Operating frequency band

Series Frequency band

ETS1000(450MHz)

series

(International BLOCK A sub-band) uplink: 452.5MHz~457.5MHz;

downlink: 462.5MHz~467.5MHz

(International Block C sub-band) uplink: 450.0MHz~454.8MHz; downlink:

460.0MHz~464.8MHz

ETS1200(800MHz)

seriesUplink: 824MHz~849MHz; downlink: 869MHz~894MHz

ETS1500(1900MH

z) seriesUplink: 1850MHz~1910MHz; downlink: 1930MHz~1990MHz

Maximum transmit power:

ETS1000 (450MHz) series: 250mW

ETS1200 (800MHz) series: 200mW

ETS1500 (1900MHz) series: 200mW

Receiving sensitivity: -104dBm.

Maximum input power: -25dBm.

Maximum packet data rate: 153.6kbps/38.4kbps (Downlink/Uplink).

Maximum circuit data rate: 14.4kbps.

Spare battery: 2-hour speaking time and 24-hour standby time. Note that

speaking time and standby time depend on the network. The type of the spare

battery is NiMH and its capacity is 12V/1500mAh.

AC power supply adapter: AC input (90V~264V AC, 47Hz~63Hz), DC output

(19V±5% DC, 1.0A).

第11章 3

Page 8: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第12 章 System Description

第13 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第14 章 Chapter 2 Features

第15 章

第11章 4

Page 9: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第17 章 System Description

第18 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第19 章 Chapter 3 SystemArchitecture

第20 章

Chapter 3 System Architecture

3.1 Appearance

27.2

Figure 1-2 Terminal appearance

3.2 Technical Parameters

Table 1-1 Technical parameters of HUAWEI ETS1000 Series Wireless Terminals

Item Description

Dimensions(W X D X H) 182mm X 182mm X 42mm

WeightLess than 1.0kg (containing rechargeable

battery)

Mounting mode Horizontally mounting or wall-mounting

Input voltage AC: 90V-264V (47Hz~63Hz)

第16章 1

Page 10: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第17 章 System Description

第18 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第19 章 Chapter 3 SystemArchitecture

第20 章Item Description

Spare chargeable batteryType: NiMH

Capacity: 12V 1500mAh

Maximum transmit power

250mW ETS1000 (450MHz) series

200mW ETS1200 (800MHz) series

200mW ETS1500 (1900MHz) series

Typical speaking power consumption 8W

Typical standby power consumption 1W

Ambient temperature -10C~50C

Storage temperature -20C~70C

Relative humidity 5%~95%

3.3 External Interface Description

Table 1-2 External interfaces of HUAWEI ETS1000 Series Wireless Terminals

Interface

name

Connector

type

Quant

ityDescription

POTS

interface

RJ11

(ITU-T Q.552)2

Two interfaces are connected internally in

parallel (the same telephone number). If

multiple telephones need to be connected in

parallel, you can extend them.

Serial data

interfaceDB9 (Female) 1

If a serial cable is connected through the

interface, you can maintain the terminal. If a

serial data cable is connected through the

interface, you can achieve data services of

the terminal.

Antenna

interfaceTNC(Male) 1

Support indoor antenna, outdoor directional

antenna, outdoor omni antenna and vehicle

mounted antenna.

第16章 2

Page 11: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第17 章 System Description

第18 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第19 章 Chapter 3 SystemArchitecture

第20 章Interface

name

Connector

type

Quant

ityDescription

Power supply

interface1-pin connector 1 DC input: +19V±5%

Power supply

indicatorGreen 1

ON: indicates that the external power supply

operates normally

OFF: indicates that no external power supply

is connected

Field intensity

indicatorGreen 4

The field intensity is indicated by ON/OFF of

indicators. The more the lit indicators, the

stronger the signal.

Battery

indicatorGreen/Orange 1

Green: indicates that the battery quantity is

sufficient

Orange: indicates undervoltage or that the

battery is charging

OFF: indicates no battery or that the battery

operates abnormally

第16章 3

Page 12: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第22 章 System Description

第23 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第24 章 Chapter 4 Service andApplication

第25 章

Chapter 4 Service and Application

4.1 Common Voice Application

The common voice application is the most primary application of HUAWEI

ETS1000 Series Wireless Terminals. Figure 4-1 shows the connection relation

between a terminal and a common telephone.

Figure 1-3 Common voice access

As shown in Figure 4-1, the telephone is connected to the POTS interface of the

terminal with an RJ11 cable. The POTS interface supplies power to the telephone

and provides the functions such as ringing and dial tone. This connection mode can

implement not only the application of common voice, but also the settings of the

terminal such as volume, operation mode and parameters. For the detailed

procedure, please refer to HUAWEI ETS1000 Series Fixed Wireless Terminal User

Manual.

4.2 Attended Public Telephone Application

HUAWEI ETS1000 Series Wireless Terminals provide charging interfaces, so you

can connect a charging meter with the terminal to implement the attended public

telephone service. Figure 4-2 shows their connection relation.

第21章 1

Page 13: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第22 章 System Description

第23 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第24 章 Chapter 4 Service andApplication

第25 章

Figure 1-4 Attended public telephone application

At present, HUAWEI ETS1000 Series Wireless Terminals support the following

charging interface standards: polarity reversal, 12KC and 16KC.

4.3 Wide coverage Application

Sometimes, the wireless access system needs to be applied to vast and sparsely

populated areas. In this case, the coverage of wireless networks is expected more

extensive as much as possible. HUAWEI ETS1000 Series Wireless Terminals are

designed with the advanced antenna-feeder lightning protection, so a high gain

outdoor antenna can be connected with them to further increase the coverage.

Since the outdoor antenna and indoor antenna share an interface, it is easy to

replace it. If the outdoor directional antenna is adopted, you need to adjust the

direction of the antenna in installation to ensure the strongest signal received (you

can determine the direction in which the strongest signal can be received by

observing the received signal strength indicator on the device panel). Figure 4-3

shows the connection relation between the outdoor antenna and the terminal.

第21章 2

Page 14: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第22 章 System Description

第23 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第24 章 Chapter 4 Service andApplication

第25 章

Figure 1-5 Wide coverage application

4.4 Data Service Application

HUAWEI ETS1000 Series Wireless Terminals provide multiple data service access

modes: circuit-switched domain data service and packet-switched domain data

service through the serial data interface. Figure 4-4 shows the connection relation

between the terminal and the PC.

Figure 1-6 Data service access

Packet-switched data services can be implemented in the following way: first you

need to install the dedicated USB driver of the terminal and the relevant Modem

driver on the PC, then dial the access number “#777”. For circuit-switched data

services, different service classes have different implementation modes. For the

第21章 3

Page 15: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第22 章 System Description

第23 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第24 章 Chapter 4 Service andApplication

第25 章detailed implementation procedure of data services, see HUAWEI ETS1000 Series

Fixed Wireless Terminal Data Service User Manual.

4.5 Fax Application

HUAWEI ETS1001/ETS1201/ETS1501 terminals can be connected with a G3 fax

machine through the RJ11 interface to implement the G3 analog fax service. Figure

4-5 shows the connection relation between the terminal and the fax machine.

Figure 1-7 Analog fax application

In addition, all of HUAWEI ETS1000 Series Wireless Terminals can be connected

with a PC through the serial data interface to implement the digital fax service.

Figure 4-6 shows the connection relation between the terminal and the PC.

Figure 1-8 Digital fax application

第21章 4

Page 16: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第22 章 System Description

第23 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第24 章 Chapter 4 Service andApplication

第25 章

第21章 5

Page 17: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第27 章 System Description

第28 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第29 章 Chapter 5 PurchaseGuidance

第30 章

Chapter 5 Purchase Guidance

HUAWEI ETS1000 Series Wireless Terminals are composed of terminal host,

antenna feeder system and optional fittings. You can purchase them as required.

5.1 Host Purchase

Table 1-1 Host purchase

Description Quantity Remarks

Terminal host 1 Compulsory

AC power supply adapter (input voltage ranges from 90V to 264V) 1 Compulsory

Cable plug of AC power supply adapter 1 Compulsory

Telephone line 1 Compulsory

NiMH (12V 1500mAh) 1 Optional

User manual 1 Compulsory

5.2 Antenna Feeder System Purchase

5.2.1 Antenna Feeder System Purchase Reference

In purchasing the antenna feeder system, you need to note the following issue:

Choosing an indoor or outdoor antenna depends on the local network (for the

network status, consult the operator). If the terminal is placed away from the base

station or in the location with severe indoor shielding, please choose the outdoor

antenna. If the terminal is placed near the base station or in the location where the

signal can be received easily, you can choose the indoor antenna. You can

determine the signal strength by observing the received signal strength indicator on

the host panel.

第26章 1

Page 18: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第27 章 System Description

第28 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第29 章 Chapter 5 PurchaseGuidance

第30 章In addition, in choosing the outdoor antenna, if there is a visible channel between

the local and the base station antenna, it is recommended that you choose the

outdoor directional antenna. Otherwise, you should choose the outdoor omni

antenna. The outdoor directional antenna has the directionality, so you need to

adjust the antenna to obtain the strongest signal in installation.

5.2.2 Purchase List for Antenna Feeder System

Table 1-2 Purchase of antenna feeder system

ItemQuantit

y

SeriesRemarks

Indoor antenna 1

ETS1000(450MHz) Optional, gain: 2.15dBi

ETS1200(800MHz) Optional, gain: 2.15dBi

ETS1500(1900MH

z)

Optional, gain: 2.15dBi

Outdoor

directional

antenna

1

ETS1000(450MHz) Optional, gain: 11dBi, 15-, 25-, or 30-

meter feeder cable can be purchased

ETS1200(800MHz) Optional, gain: 12dBi, 15-or 30-meter

feeder cable can be purchased

ETS1500(1900MH

z)

Optional, gain: 12dBi, 15meter feeder

cable can be purchased

Outdoor omni

directional

antenna

1

ETS1000(450MHz) Optional, gain: 5.5dBi, 15-meter feeder

cable

ETS1200(800MHz) -

ETS1500(1900MH

z)

-

Note:

You need to purchase at least one of indoor antenna, outdoor directional antenna and outdoor omni

antenna.

第26章 2

Page 19: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第27 章 System Description

第28 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第29 章 Chapter 5 PurchaseGuidance

第30 章5.3 Purchase of Terminals Supporting Fax Function

Following takes the ETS1200/ETS1201 terminals as an example. The ETS1201

terminal implements the analog fax function by adding a fax module to the

ETS1200 terminal. Therefore, the two terminals have the same functions except the

analog fax function. Since the fax module of the ETS1201 terminal is installed on

the terminal before delivery, you can not implement the analog fax function of the

ETS1200 terminal only by purchasing the fax module and adding it to the terminal.

Generally, before purchasing the terminals, you should consult the local operator or

sales representative to determine the approximate proportion between the

terminals supporting and not supporting the fax function. Then you determine the

purchase quantity of ETS1200 and ETS1201 terminals. For ETS1000/ETS1001

and ETS1500/ETS1501 terminals, you should adopt the same purchase principle.

5.4 Select of Product Features

Before purchasing a certain type of terminal, user should confirm the detailed

features. There are mainly two features of ETS1000 terminals for selection: sub-

band and UIM card installation method.

Sub-band

Sub-band selection mainly intends to ETS1000 (450MHz) series terminals. Now

two types of terminals are available for supporting BLOCK A sub-band and BLOCK

C sub-band of 450MHZ band respectively. The sub-band information are shown in

Table 2-1.

UIM card installation method

There are mainly two kinds of installation methods: ROM-SIM (terminal and card

integrated) and R-UIM (terminal and card separated).

Note:

You can find the features of a terminal on its nameplate.

第26章 3

Page 20: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第27 章 System Description

第28 章 HUAWEI ETS1000 Series Fixed Wireless Terminal

第29 章 Chapter 5 PurchaseGuidance

第30 章5.5 Purchase of Optional Fittings

5.5.1 Purchase Reference of Optional Fittings

If needed, you can obtain more service functions by purchasing some optional

fittings.

Data suite

The data suite is a necessary tool to implement data services (packet-switched

data service and circuit-switched data service). It includes a serial data cable, CD

containing the driver and a CD containing Data Service User Manual.

Maintenance suite

The maintenance suite is mainly supplied to the operators and the maintenance

departments for the terminal maintenance. It includes a maintenance cable and a

CD contained the maintenance tool software.

5.5.2 Purchase List for Optional Fittings

Table 1-3 Purchase of optional fittings

Item Quantity Remarks

Data suite 1Optional, including a serial data cable, CD containing the

driver and a CD containing Data Service User Manual.

Maintenance

suite1

Optional, including a UART cable and a CD contained the

maintenance tool software. It is used for the terminal

maintenance and the parameter settings.

Note:

Since the data suite and the maintenance suite have their respective code, you do not need to

consider the specific cable and CD in purchase.

第26章 4

Page 21: 01-ETS1000 Series Fixed Wireless Terminal System Descrip (1)

第32 章 System Description

第33 章 HUAWEI ETS1000 Series Fixed Wireless Terminal 第34 章 Chapter 6 Acronyms

第35 章

Chapter 6 Acronyms

Abbreviation Full name

A

ARPU Average Revenue Per User

D

DTMF Dual Tone Multiple Frequency

P

POTS Plain Old Telephone System

U

UART Universal Asynchronous Receiver/Transmitter

第31章 1


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