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The RTU-292 is an automatic telephone interconnect
unit for the connection of one telephone line with one radio.
It offers the flexibility of several modes for manned or unmanned
station operation.
RTU-292是一台为一条电话线和一台无线电提供自动电话互接的单元。它为人工或无人工作站操作提供几种不同模式的灵活性。
General Features 一般性能
The RTU-292 Radio/Telephone Interface Unit provides trouble-free
automatic connection between a radio system and a telephone system
or other two- wire line. The unit is suited for use with HF,VHF,UHF,
or satellite systems and is applicable to full-duplex or half-duplex
modes. The unit incorporates a full-featured telephone set and
monitor speaker.
RTU-292无线电/电话接口单元为一套无线电系统和一套电话系统或其他两线电线提供无故障自动互接功能。该单元适用于HF,
VHF, UHF或卫星系统，并适用于全双工或半双工模式。该单元可实现全功能的电话机和监听喇叭的性能。
When used in manual mode, first a radio-to-radio
link is established. Then, using the telephone in the RTU-292,
the operator places a call to the distant telephone that will
be patched into the radio link. Once the distant telephone party
is on the line,the operator pushes a front-panel button to complete
the patch to the radio link. The operator may communicate with
either party using the unit's handset, and may monitor both sides
of the conversation with the speaker.
在人工模式下，首先建立起一条无线电-无线电的链接。接着，在RTU-292上使用电话功能，操作者将一个呼叫的长途电话分配入无线电链接中。一旦接通了长途电话后，操作者按下前面板上的一个按钮来实现将其接入无线电链接中。操作者也可使用该单元上的手持话筒同线路两头的任意一边通话，并可通过喇叭对两边的对话加以监听。
Auto-Dial/Auto-Answer 自动拨打/自动应答
The RTU-292 contains auto-dial/auto-answer capability. This
feature enables users to dial from any phone system through unmanned
radio stations into other phone systems. Since the RTU-292 has
built-in DSP VOX capability, the voice on the phone line at each
end of the link keys that RTU-292's respective unmanned radio.
RTU-292具有自动拨打/自动应答的能力。该性能可以使得用户通过无人职守的RTU-292无线电站从任何的电话系统中拨打到任何其它的电话系统中。由于RTU-292配备了内置的DSP（数字信号处理器）VOX（话音控制传输）的能力，在该链接中的任意一端的电话线上的话音可音控RTU-292上各自的无人值守电台。
Local Control and Monitor 本地控制与监控
With its handset and front panel telephone keypad, the RTU-292
may be used as a telephone (independent of radio connections)
using either DTMF or pulse dialing. The handset may also be used
to transmit and receive via the radio without a telephone connection.
The front panel includes pushbuttons for monitoring the radio
audio, telephone audio, or both simultaneously using the front
panel speaker and/or headphone jack.
利用手持话筒和前面板上的电话拨号按键，RTU-292可使用DTMF或脉冲拨号作为一部电话使用（独立于无线电链接之外）。手持话筒也可通过没有电话连接的电台实现无线电收发功能。前面板包括一些按键，它们可用于监听无线电话音、电话话音或同时使用前面板喇叭和/或耳机插头。
Radio Interface 无线电接口
The RTU-292 offers a standard four-wire audio connection to
the radios with balanced/unbalanced 600 Ohm or high impedance
interfaces. The unit also provides a transmit PTT driver, receiver
COR input and serial port for optional remote control of radios.
Input and output levels are adjustable to accommodate all types
of radio systems. A setup mode allows the adjustment of signal
levels without the need for external test equipment.
RTU-292提供带有600欧姆或高阻抗的平衡/不平衡接口的标准四线接线可连接到电台上。该单元也提供一个发射PTT的驱动，COR输入的接收器和为可选的无线电遥控配备的串口。输入和输出电平可根据所有不同类型的无线电系统而加以调整。一个设置模式可允许在没有外部测试设备需要的情况下对信号电平加以调整。
Telephone Interface 电话接口
The PSTN telephone interface of the RTU-292 contains a unique
adaptive hybrid circuit implemented with DSP. This circuit is
completely automatic, eliminating conventional VOX and hybrid
adjustments. The adaptive hybrid achieves a broadband balance
on reactive phone lines and continuously adapts to changing line
conditions, making operation insensitive to line impedance changes.
The unit has an RJ11C connector on its rear panel into which a
PSTN line, cellular telephone, or satellite terminal can be plugged.
A 4-wire capability allows the RTU-292 to interface a device like
a STU-III secure telephone set with a radio.
RTU-292上的PSTN电话接口包括一项独特的由DSP处理的自适应混合电路。该电路是完全自动的，消除了传统的VOX和混合线路的调试问题。自适应混合电路在激活的电话线上已达到了宽带平衡，并可持续性地适应变化的线路条件，令操作对于线路阻抗变化敏感。
该单元在其背板上配有RJ11C接头，可接入一条PSTN线路、手机电话或卫星终端。
一个四芯的接线能力允许RTU-292和电台可接入如STU-III的保密电话的装置。
Voice Prompts 语音提示
When equipped with the voice prompt option,the RTU-292 contains
prerecorded messages called voice prompts that are played to guide
the user in the operation of the system. For example, a radio
user attempting to access the system would hear the words "enter
password". When successfully connected, the user would hear "connection
was successful, proceed with your conversation". These voice prompts
inform the user of the status of the system and the call they
are placing, helping an inexperienced or infrequent user to know
the status of the system..
当装入语音提示选项后，RTU-292装有称为语音提示的预先录音的留言，在系统运行时播放给用户指导操作。例如，一个无线电用户试图进入系统则将听到"输入密码"的提示。当成功接入后，用户则将听到"接入成功，开始通话"。这些语音提示告知用户系统的状态和所拨打的电话，帮助没有经验或不经常使用的用户了解系统状态。
Options 选项
In addition to the HF ALE option and the Voice Prompt option,
the RTU-292 can be equipped with a Radio Remote Control option,
a VMR (Voice Modulation Recognition) Noice Reduction option, and
a Local Phone option. The Local Phone option allows a conventional
telephone to control the RTU-292 via a length of twisted pair
field wire. The VMR/Noice Reduction option uses a second DSP to
provide high reliability VMR and effective noise reduction to
HF radios.
The Radio Remote Control Option uses the RTU-292's serial port
to remotely control radios over telephone lines, permitting a
user to change internal radio parameters such as mode, channel,
or frequency of distant unmanned radios. Optional software is
available for many kinds of radio remote control and different
operational scenarios.
除了HF ALE选项和语音提示选项外，还配有一个无线电遥控选项，一个VMR（话音调制识别）/减噪选项，和一个本地电话选项。本地电话选项可允许一部传统电话通过一条双绞被复线对RTU-292加以控制。VMR/减噪选项使用一个二次数字信号处理来提供高可靠性的VMR且有效地降低HF电台的噪音。
无线电遥控选项利用RTU-292的串口通过电话线遥控无线电台，允许一个用户改变无线电的内设参数，如：远端无人电台的制式、频道或频率。可为提供无线电遥控的多种电台和各种不同操作环境提供可供选择的软件。
RTU-292 HF ALE Telephone System Application 电话系统应用
The RTU-292 is set up to intertface cleanly
with a computer for the purpose of automatically sending or receiveing
telephone calls over an HF link using ALE capability. If a customer
already has computer control of the HF ALE capability, the RTU-292
may be interfaced to the computer without any engineering design
modifications in the unit.
The RTU-292 can also be used to construct a system which interconnects
two telephone systems via a half-duplex HF Radio link without
computer intervention. In this situation, the RTU-292 must provided
with the HF ALE controller if this capability doesn't already
exist. This system uses the Automatica Message Display (AMD) message
facility of a FED-STD-1045 Automatic Link Establishment (ALE)
system to transfer telephone numbers from the local to the distant
station. The RTU-292 allows an untrained user who is unfamiliar
with radio operating procedures to make a telephone call over
a radio link. A user must know only the following three numbers:
(1) the telephone number of the local unmanned radio station,
(2) his user password, and (3) the destination code of the distant
individual or facility he wishes to call ( if this information
has been previously stored in the speed dial memory of the RTU-292).
RTU-292设置时接入一台电脑，目的是为了利用ALE功能在HF链路上自动拨打与接听电话。如果一个客户已经具有了HF ALE的电脑监控能力，则RTU-292可直接同电脑连接而不需要在该单元上做任何工程设计上的修改。
RTU-292也能够被用于搭建一个系统，在没有电脑的介入下，通过一个半双工的HF无线链接实现两个电话系统的通信互通。在此状态下，如果该功能没有存在的话，RTU-292在直接接入HF
ALE控制器时必须有客户软件的支持。该系统采用一个FED-STD-1045自动链路建立(ALE)的自动信息显示(AMD)发信功能，将电话号码从本地发送到远端机站。一名用户仅需知道以下三个号码：（1）本地无人机站的电话号码；（2）所使用的密码；（3）希望拨打的远端私人或设施的所在地区号（如果该信息已被提前储存于RTU-292自动拨号中）。
Block Diagram Description 框图说明
The block diagram on next page shows the system connections
and equipment necessary to pass telephone numbers and audio over
an HF ALE radio system. The system includes, at each end, an HF
transceiver equipped with ALE interfaced to an RTU-292. Of course,
the system is not limited to two stations, but may include any
number of stations, each with its own address in the ALE system.
在下一页的框图说明了系统链接以及需要在HF ALE无线电系统中拨打电话号码和传输话音所需配备的设备。该系统包括在每一端的一台HF收发机上配备有ALE接入RTU-292的接口。当然，该系统不仅限于两个基站，而包括更多的基站，但每个基站都必须在ALE系统中有其各自的地址。
以上框图说明了一台RTU-292同一个战术或机载VHF/UHF电台系统相连接的应用。在此系统中，RTU-292接受指令从远端电台来拨打预先储存的一组电话号码中的一个号码。电台可以通过DTMF或一系列的"静噪中断"向RTU-292发出指令，来决定其选择的电话号码。在两种情况下，RTU-292利用语音提示回答电台指令，通知远端电台用户所做的选择，并在开始处理以前请求确认。一旦链接建立，RTU-292上的VOX在电话线一方说话时键控基地电台。请注意此项操作为全自动的，而且远端站点也不需要人工控制。
Main Operating Scenario 主要操作情况
User at the telephone set A desires to place a call through
the HF system to distant telephone set D.
位于电话机A位置的用户要通过HF系统拨打长途电话至电话机D。
1. The user picks up the receiver of telephone set
A and dials the number of the local RTU-292 system. 该用户拿起电话机A的话筒，拨打本地RTU-292系统的号码。
2. RTU-292 B answers with a voice message and waits for the
user to enter his password RTU-292 B语音留言应答，等待用户密码输入（密码设置可选择）。
3. User enters his password and the function code for placing
a call through the ALE system.
The following functions are typically available
from the RTU-292:
用户输入其密码，和通过ALE系统拨打电话的功能代码。以下功能是RTU-292提供的典型选项：
Place a call. 拨打电话。
Monitor receiver audio. 监听接收机话音。
Transmit/Receive via phone. 通过电话收发。
Switch VOX on/off. 切换VOX开/关。
Key/unkey the transmitter. 开/关发射机。
Store number in speed dial memory. 存储快速拨号记忆。
Recall a number from speed dial. 从快速拨号中调出所需号码。
Cancel a number from speed dial. 取消操作。
Disconnect (hang up) 切断链接（挂机）。
4. If the ALE system is available, the RTU-292 responds with
a voice message. 如果有ALE系统，RTU-292可利用语音留言作为应答。
5. Using the telephone keypad, the user enters the speed dial
code for the stored telephone number he wishes to dial. If the
desired number is not yet stored in the RTU-292, the user may
entewr the information mannually. The number includes the address
of the distant ALE system plus any digits that must be dialed,
such as the area code, contry code, etc.
利用电话键盘，用户键入快速拨号代码，调出他所希望拨打的已储存电话号码。如果他所希望拨打的号码尚未储存在RTU-292中，用户可人工键入该号码。该号码包括远端ALE系统地址，加上任何需要键入的号码，如区号、国家代号等等。
6. If the ALE system is available, the RTU-292 passes the number
to be dialed to the ALE system's orderwire message buffer, and
directs the system to link with the distant station.
如果有ALE系统，RTU-292将这些拨打的号码传递给ALE系统的Orderwire信息缓冲器后，再令系统链接远端基站。
7. At this point, the telephone user is given a voice prompt
stating that the link is being established.
此时，电话用户接到一个语音提示，告知链路已建立完成。
8. When a link is made, a voice message is sent to the phone
A, while the distant RTU-292 obtains the number to be dialed from
the ALE's orderwire message buffer and dials the distant phone
number. If the link should fail, a voice prompt is sent and the
user may then hang up or dial another number.
当链路搭建完毕后，一个语音信息被发送到电话A上，同时远端RTU-292获取了通过ALE的orderwire信息缓冲器所拨打出的号码并拨打远端电话号码。如果该链接失败，会有一个语音提示发出，用户可挂机或拨打另一个号码。
9. The party at the distant phone D answers and hears a voice
message that he is receiveing a call via radio. He may then key
the transmitter via DTMF commands or use VOX (default) and talk
to the party who dialed at A.
位于长途电话D的一端应答并听到一个语音留言，告知他正接听一个通过无线电拨打来的电话。他可接着通过DTMF指令或使用VOX（默认）来键控发射机，并同拨打电话的A方进行通话。
Call Progress Monitoring 电话进程监听
The RTU-292 contains sophisticated call progress monitoring
which enables the distant unit to determine when a party has actually
answerd the distant phone. This is necessary because following
distant call dialing, several scenarios are possible:
RTU-292带有完善的电话进程监听功能，令远端部门测定何时有人确实应答了长途电话。该功能是必要的，原因是长途电话拨打有以下几种可能：
The call is answered normally. 电话被正常接听。
The call is not answered. 电话没有被接听。
A dead line results. 断线结果。
A busy or trunk busy is obtained. 线路繁忙或主干线路被占。
The call is answered by a FAX machine or modem. 电话被传真机或调制解调器应答。
Other Operational scenarios 其他操作情况
The main scenario describes a call placed from telephone A to
telephone D, but all other call combinations are possible including
calls from 292 local phone C or RTU-292 B to distant points D,
E or F(refer to the block diagram below)
主要情况描述为从电话A拨达到电话D，但所有其它拨打电话的可能组合包括从RTU-292本地电话C或RTU-292 B拨打远端D,
E或F（参见下图）。
In another application, an ALE equipped HF
radio may call into either station shown in the block diagram
below and place a telephone call via the RTU-292 in the system.
在其他应用中，一个配备有ALE的HF电台可以呼叫以下框图内的任何一个基站，并可在系统内通过RTU-292拨打电话。
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