Transmitter-transmitter

Size-dimension

Weight-weight

Power output-power output

Circuit type-circuit type

Working mode-mode

Selectivity-selectivity

Fine adjustment range of reception/transmission-RIT/XIT range

Receive frequency range-receive frequency range

Emission frequency range-emission frequency range

Frequency accuracy-accuracy

Frequency stability-stability

Intermediate frequency-intermediate frequency

Intermediate frequency offset range-intermediate frequency offset range

Sensitivity-sensitivity

Silent sensitivity-squelch sensitivity

carrier

Carrier suppression-carrier suppression

Harmonic radiation-harmonic radiation

Mixed radiation-parasitic radiation

Balanced modulation-balanced modulation

Modulation mode-modulation type

Reactance modulation-reaction modulation

Low level modulation-low level modulation

Antenna impedance-antenna impedance

Power supply voltage-power supply voltage

Power consumption-power consumption

Audio output power-audio output power

Audio output impedance-audio output impedance

Audio response-audio response

Frequency shift keying to FSK-frequency shift keying

Automatic amplitude control

Active acoustic equipment active acoustic software

ABS American bureau of standards American bureau of standards

ABSS automatic blank scanning

Absolute running time

SBTD automatic large-capacity tape degausser tape automatic integral degaussing circuit

Stop (re-record or play).

A-B test AB comparative listening

damper

Sound is absorbed by objects.

ABX acoustic bass extension bass extension

AC storage battery rechargeable battery

Air conditioning adjustment calibration adjustment-calibration

Alternating current

BG0AAI to Radio Europe.

CQ Europe, CQ Europe, this is BG0AAI, BG0AAI to CQ for standby.

who is calling? This is BG0AAI, please call me again.

QRZ？ This is bg0ai, bg0ai. Please call me again.

JA 1, this is BG0AAI. I didn't copy the suffix of your call sign. Please call me again.

Japan Alpha One somthing, this is BG0AAI, I didn't copy your suffix, please call me again.

You copied the prefix of my call sign wrong. It should be BG0 instead of BD0.

You copied my prefix by mistake. Not Bravo Delta Zero, but Bravo Golf Zero.

What's the last letter of your call sign?

What's the last letter of your call sign?

My call sign is not BG 0AA, and the last letter is I, BG 0AA, understand?

My call sign is not BG0AAA, and the last letter is I, like India. Bravo Golf Zero Alpha India, do you copy?

I'm sorry, I didn't copy your call sign because of the interference of other radio stations. Please repeat it slowly.

Sorry, I didn't copy your call sign because of QR-Mike. Please call me again slowly.

Add-drop multiplexer;

Broadband management is realized by time slot exchange, that is, different VCS interconnection between two STM-N signals is allowed, and various interface signals (PDH) or STM-N signals (SDH) specified in G.703 can be connected to STM-M (M >: N) to make any branches.

AON active optical network;

Active optical network is a point-to-multipoint optical communication system, which consists of ONU, optical remote terminal OLT and optical fiber transmission line.

ATM passive optical network;

The ideal long-term solution combining ATM multi-service multi-bit rate support capability and transparent broadband transmission capability of passive optical network represents the latest development direction of broadband access technology facing 2 1 century.

Asymmetric digital subscriber line;

Asymmetric digital subscriber line system ADSL is a digital subscriber line DSL system using discrete multi-tone DMT line codes.

AA adaptive antenna;

An antenna, such as the antenna of a mobile phone, provides a beam that points directly at the target and can automatically adjust the power and other factors with the movement of the target. It is also called a smart antenna.

Adaptive differential pulse code modulation:

A coding technique that reduces the number of analog samples from 8 bits to 3 ~ 4 bits to complete the compression of transmission signals. ITU-T Recommendation G.72 1 defines the algorithm of 32-bit ADPCM (8,000 samples per second, 4 bits per sample). Compared with traditional pulse code modulation, its transmission capacity is doubled.

Automatic decision feedback equalizer; Adaptive decision feedback equalizer:

An equalizer technology can eliminate the influence of noise on the reverse tap signal by using the judgment signal as the input signal of the reverse tap.

AMI alternate mark inversion signal alternate inversion code;

A common coding technology in digital transmission. Logic 0 is represented by zero level, while logic 1 is represented by alternating positive and negative voltages.

AON all-optical network All-optical network means that the signal channels between end-user nodes in the network still maintain the optical form, that is, the end-to-end all-optical path without photoelectric converter in the middle. In this way, there is no obstacle to photoelectric conversion in the flow of optical signals in the network, and the information transmission process does not need to face the difficulty of improving the information processing speed of electronic equipment.

AOWC all-optical wavelength converter;

It refers to a device that directly converts information from one optical wavelength to another optical wavelength without electric domain processing.

Amplitude keying:

A key technology, corresponding to binary modulation signal, carries the signal to switch between on and off, also known as on-off key control.

Automatic transmission power control;

The key of this technology is that the output power of microwave transmitter automatically tracks the change of receiving level of connecting device within the control range of ATPC. Its advantages include reducing interference to neighboring systems, reducing up-attenuation, reducing DC power consumption, improving residual error characteristics, and increasing output power by 2dB under fading conditions.

AWF full-wave fiber:

The water peak of optical fiber at 1383nm is eliminated, so that more than 120 new wavelengths can be added at 1350- 1450 nm (interval 100GHZ). It is very beneficial for users of urban access networks.

AU snap-in snap-in:

An information structure that provides an adaptation function between a higher-order channel layer and a multiplexing segment layer.

AUG management unit group management unit group:

It consists of one or more management units, which occupy a fixed position in the STM-N payload and determine the position.

APD avalanche diode;

A high sensitivity detector for multiplying photocurrent by avalanche multiplication effect.

Optical power amplifier;

An optical amplifier which can compensate the loss of optical multiplexer and improve the input power of optical fiber.

BBER background block error rate background block error rate:

For a certain test time, the ratio of BBE number in available time to the total blocking number after deducting unavailable time and all blocking during SES.

BR basic rate access basic rate access:

ITU-T is defined as the interface rate of narrowband ISDN, also known as 2B+D, with B channel 64K as the bearer channel and D channel 16K as the digital signaling channel.

Bluetooth Bluetooth:

(A wireless local area network) standard is a wireless local area network standard with a coverage of 10M, a working frequency band of 2.4G and a transmission rate of about 1m jointly formulated by equipment manufacturers.

C-band:

That is, the working wavelength is in the range of 1525 ~ 1560 nm, and the bandwidth is about 35nm.

Twitter:

When a single longitudinal mode laser works in direct modulation, the change of injection current will cause the change of carrier density, and then the refractive index of the active region will change, resulting in the change of the optical path length of the laser resonator, which will lead to the oscillation wavelength drifting with time. Generally, external modulation technology is needed to overcome it.

Container c container c:

The information structure of service signals carrying various rates is expressed as C-N (1 1, 12,3,4), while China only involves C- 12, C-3 and C-4. The basic function of the container is to complete adaptation, that is, code speed adjustment.

CSMA/CD carrier sense multiple access with collision detection protocol;

A multiple access technology applied to wired local area network.

CSMA/CA Carrier Sense Multiple Access/Collision Avoidance Protocol;

Because it is difficult for wireless products to detect whether there is channel collision, 802. 1 1 defines a new protocol, namely (CSMA/CA). On the one hand, carrier sense-check whether the channel is idle; On the other hand, avoid collision-when the channel is not idle, wait for a random time and send it first until a new idle channel appears, which can minimize the probability of signal collision. In addition, in order to make the system more stable, 802.5438+0 1 also provides an ACKnowledgement frame ack for CSMA/CA. When encountering other noise interference, or because of interception failure, signal collision may occur. This kind of ACK working in MAC layer can provide fast recovery ability at this time.

Carrier to noise ratio:

The ratio of carrier level to noise level before any modulation. Also known as c/n.

Cross polarization Cross polarization:

The two antenna systems use the same frequency, but one uses horizontal polarization and the other uses vertical polarization, which improves the spectrum utilization.

DCF dispersion compensation fiber dispersion compensation single-mode fiber is a kind of fiber with large negative dispersion, which is a new type of fiber designed for laying 13 10nm. A certain dispersion compensation fiber is added to G.652 fiber for dispersion compensation, so as to ensure that the total dispersion of the whole fiber line is approximately zero.

DFF dispersion flattened fiber dispersion flattened fiber;

The broadband dispersion from 1.3 μm to 1.55 μm can be made very low, almost reaching zero dispersion.

Diversity reception of DR diversity receiver is a measure to select or combine the outputs of two or more receivers with small correlation (that is, the quality deteriorates at the same time) to reduce the influence caused by fading. Specifically, it can be divided into spatial diversity, frequency diversity, polarization diversity and angle diversity.

Dynamic packet transmission technology of DPT dynamic packet transmission;

This is a new transmission mode proposed by Cisco -IP optimized optical transmission technology. This technology provides efficient bandwidth utilization, rich service types and advanced network self-healing function.

Optical demultiplexer;

Multiple wavelengths are divided into optical fibers to separate channels.

DSF dispersion-shifted fiber;

It is called 1550nm single-mode fiber with the best performance. By designing the refractive index profile of the optical fiber, the zero dispersion is shifted to the window of 1550nm, so as to match the minimum attenuation window of the optical fiber, which makes ultra-high speed and ultra-long distance transmission possible.

Dynamic synchronous transfer mode Dynamic synchronous transfer mode:

A new technology based on high-speed circuit switching and dynamic time slot allocation. As the second layer switching/transmission technology, DTM has stronger bandwidth management ability and adapts to the continuous expansion of optical fiber bandwidth.

Dense wavelength division multiplexing;

Compared with the coarse wavelength division multiplexing of optical wave multiplexing in different low loss windows, multiple optical waves are multiplexed in the same low loss window.

DLC digital loop carrier:

Active optical network, suitable for areas with dense users.

Dxc digital cross connect digital cross connector:

Devices with one or more quasi-synchronous digital hierarchy (G.702) or digital system (G.707) signal ports can be controllably connected and reconnected at any port signal rate (and its sub-rate).

Electroabsorption modulator;

The loss modulator operates at the wavelength of the absorption region of the modulator material, and when the modulator is unbiased, the wavelength is in the on state. With the increase of bias voltage on the modulator, the absorption coefficient at the original wavelength becomes larger, the modulator becomes off, and the switch state of the modulator is light intensity modulation.

EB error block error block:

In SDH network, the bit error performance of high bit rate channel is "block", that is, the set of continuous bits transmitted in the channel. When any bit in a block has an error, the block is called an error block.

ECC embedded control channel embedded control channel:

The physical channel for the embedded control channel to transmit network management information is DCC, which adopts the seven-layer protocol stack required by ITU-T G.784

EDFA erbium-doped fiber amplifier adopts a special process when making optical fiber, and the corresponding erbium-doped fiber is made by doping erbium ions with very low concentration in the core layer deposition. Doped ions in optical fiber jump to metastable high excited state after being excited by pump light, and are induced by signal light to generate stimulated radiation, thus forming coherent amplification of signal light. EDFA works in 1550 window. Commercial EDFA has low noise, good gain curve, large amplifier bandwidth, compatibility with wavelength division multiplexing (WDM) system, high pumping efficiency, stable working performance and mature technology, and is favored in modern long-distance high-speed optical communication systems. At present, erbium-doped fiber amplifier (EDFA)+ dense wavelength division multiplexing (DWDM)+ non-zero dispersion fiber (NZDF)+ photonic integration (PIC) is becoming the main technical direction of long-distance high-speed optical fiber communication lines in the world.

EDFL erbium-doped fiber laser erbium-doped fiber laser;

A fiber laser, the wavelength of its output light falls within the window of 65438±0550nm. Optical plate is composed of doped fiber, optical pump and other related optical elements, such as wavelength selector, polarization controller, input/output coupler, etc. It has the advantages of low threshold and compatibility with optical fiber communication systems. In particular, tunable ring EDFL has become the mainstream of tunable lasers because of its wide tuning range and high output power. Its main types are polished tunable WDM device type, DFB type, fiber birefringence tuning type, piezoelectric tunable fiber F-P etalon type and so on. EDFL is suitable for large-capacity long-distance optical fiber communication and WDM systems.

The second error second of ES error:

When one 1 sec has one or more block errors, it is called block error seconds.

ESR error second ratio:

For a certain test time, the ratio of the number of es to the total number of seconds in the available time.

Forward error correction Forward error correction:

It is a data coding technology. Error detection in transmission is verified by the receiver, and if there is an error, the sender is notified to resend. It allows re-encoding from coded data with low bit errors to form an error-free data stream.

FWM four-wave mixing Four-wave mixing;

Four-wave mixing (FWM), also known as quartic mixing, when two or three light waves with different wavelengths interact, new light waves are generated, which are called mixed products or sidebands with other wavelengths. These lights will affect the normal communication. This nonlinear optical effect is called four-wave mixing.

Frequency division multiple access