電話交換機(jī)與電話數(shù)字交換機(jī)的區(qū)別

The telephone switchboard is an automatic telephone exchanger controlled by computers according to a pre programmed program. It is composed of hardware and software. The hardware includes telephone part, control part and input and output part. The software includes program part and data part.

電話交換機(jī)通常分為空分程控電話交換機(jī)和時(shí)分程控電話交換機(jī)。前者是通過交叉點(diǎn)的連通，將某條線上的空隙話音信息，傳遞到另一條線上；后者是將時(shí)分復(fù)用線上的某一時(shí)隙話音信息，傳遞到另一時(shí)分復(fù)用線上。

Telephone switches are usually divided into empty SPC telephone switches and time division program-controlled telephone switches. The former transfers the voids information on one line to another through the connection of crossover points, and the latter transfers the voice information from one time slot to another on the other time line.

目前電話交換機(jī)主要分為模擬和數(shù)字的主要區(qū)別如下：

At present, the main differences between analog and digital telephone switches are as follows:

1、相對(duì)于模擬電話交換機(jī)，數(shù)字電話交換機(jī)通話距離遠(yuǎn)、傳輸速度快、通話音質(zhì)清晰、誤碼少。

1. Compared with analog telephone switches, digital telephone switches have long distance, fast transmission speed, clear voice quality and little bit error.

2、數(shù)字電話交換機(jī)為全繩路無阻塞，那么模擬交換機(jī)它有繩路線限制，當(dāng)然交換機(jī)容量越少它的通話繩路也就越少。而模擬交換機(jī)有繩路線限制，當(dāng)交換機(jī)容量越少時(shí)它的通話繩路也就越少，通話量大時(shí)會(huì)造成死機(jī)。

2, the digital telephone exchange has no blocking for the whole rope Road, so the analog switch has a rope route restriction, and the less the capacity of the switch is, the less the call line it will be. The analog switch is restricted by the rope route, and the less the switch capacity is, the less the call line is, and the heavy traffic will cause the crash.

3、數(shù)字交換機(jī)接口豐富，它可以接入環(huán)路中繼、載波、E/M、2M等中繼，包括數(shù)字用戶的2B+D、30B+D，具備組網(wǎng)、局用機(jī)匯接功能。

3, the digital switch interface is rich, it can access loop relay, carrier, E/M, 2M and other relays, including digital users' 2B+D and 30B+D, and has the functions of networking and office machine tandem.

4、數(shù)字交換機(jī)通話間隔遠(yuǎn)、傳輸速度快、通話音質(zhì)清楚、誤碼少。而模擬交換機(jī)相對(duì)而言相差好幾倍。

4, the digital switch is far away from the telephone, the transmission speed is fast, the voice quality is clear, and the bit error is less. The analog switches are a couple of times different.

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