What is T1 broadband and what is T3 broadband?

T1 and E1 are physical connection technologies, digital networks, can be coaxial or fiber-optic, T1 is the American standard, E1 is the European standard, China's private lines are generally E1, and then according to the needs of the user, the channel allocation (in 64K units). For example, PPP DDN lines and frame-relay lines can be used.

E1 is generally used to connect 2m lines, or used to split the bandwidth after coming out of the optical transceiver, for example, a 10m line is divided into 4 2m lines, etc., why 4 2m, because there is a loss.

The physical layer of E1 uses digital encoding.

T1 E1 means that it has a high-quality call and data transmission interface, North America uses the T1 standard, which can support 24 users of MAX at the same time, while Europe uses the E1 standard, which can support 30 users, and T1 E1 is only a simple interface of MAX.

T1 E1 is another standard for high-speed transmission. A T1 E1 can have multiple concurrent channels at the same time, and each channel is an independent connection. The standard T1 service in the U.S. provides 24 channels, and the rate of each channel is that the service and its corresponding equipment are more expensive than ISDNs and ordinary **, but the relative cost of T1 E1 is less.

The T1 E1 is typically used in large organizations that require high-bandwidth, high-speed transmission between remote sites. The 64K Private Data Line (DDL) is also available as a variant or a branch service of the T1 service. When you are planning to order a T1 E1 cable, remember the buffering function provided by the proxy server, which can effectively save bandwidth.

T1 provides 23 B channels and one D channel, which is 23B+

E1 provides 30 B channels and one D channel, i.e. 30B+

T1 is the use of synchronous time-division multiplexing, 24 voice paths are multiplexed on one high-speed channel, and China adopts the European E1 standard. is 30b+2d, and the velocity is.

T1 is pretty fast, and it's actually the speed at which you can surf the Internet.

That's why it's called T1 broadband.

Now there is also T2 Wideband T2 is multiplexed by 4 T1 time divisions at speeds up to.

The 24-channel pulse code modulated PCM in North America is referred to as T1

Rate is a type of network of the OSPF protocol: a point-to-point network.

The T1 system used in North America has a total of 24 channels, and each channel sampling pulse is encoded with 7 bits, and then 1 bit of signaling element is added, so one lane occupies 8 bits. The frame synchronization code is encoded by 24 channels and then added 1 bit, so that each frame has a total of 193 bits, so the data rate of the T1 primary group is .

China adopts the European E1 standard. It is 30b+2d, and the speed is t1, which is also the abbreviation of Terminator 1 (full name The Terminator).

Answer: Network transformers, specifically T1 E1 isolation transformers; ISDN ADSL interface transformer; VDSL high-pass low-pass filter module, interface transformer; T3 E3, SDH, 64Kbps interface transformer; 10 100base, 1000base-tx network filter; RJ45 integrated transformer.

In Ethernet devices, when RJ45 is connected via PHY, a network transformer is added in the middle. Some transformer center taps are connected to the ground. And when connected to the power supply, the power supply value can be different,,, there are.

Theoretically speaking, it is possible to connect the transformer directly to the RJ45 without connecting it, and it can also work normally. However, the transmission distance is very limited, and it will also be affected when connected to different levels of network ports. And the external interference to the chip is also very large.

When a network transformer is connected, it is primarily used for signal level coupling. For one, it can enhance the signal so that it can be transmitted farther; Second, the chip end is isolated from the outside, the anti-interference ability is greatly enhanced, and the chip is greatly protected (such as lightning strikes); Third, when connected to different levels (such as PHY chips, some PHY chips are network ports), it will not affect each other's devices.

T3 class broadband (T3 transmission speed) is the transmission of signals at megabits per second.

Take 1024 * 45 = 46000 trillion.

If the user needs to apply for telecom broadband, he can directly bring his ID card to the local telecom business hall to handle the broadband**, and there will be staff to install broadband within 24 hours after the processing, or he can handle the broadband through the telecom online business hall, the method is as follows:

1. Log in to the online business hall of China Telecom, then point to the broadband, and then click on the rate 2 that needs to be handled, and then select the appropriate broadband**.

3. After selecting, click to buy now, and then fill in the handling information and pre-deposit the fee on the handling page 4, and then submit the order, and there will be staff to install broadband lines within 24 hours.

To apply for broadband, you need to first check whether there is a line, and then bring your ID card or other documents to the business hall to pay the fee, and the operator will help you install it.

1. In China, household broadband is generally used in ordinary network cables and optical fibers, and the handling of broadband requires real-name system, so registering identity information is the first step.

Second, each broadband is required "fiber optic cat" or "ordinary cat", used to receive the broadband signal of the main line, and the business hall will let you buy the designated "cat" when you handle it.

3. If you need a mobile phone to access the Internet or use a wireless network, you need to buy a wireless router and connect it to the "cat", so that you can virtually come out of the wifi signal for mobile devices.

I recommend China Telecom to you, the network speed is relatively stable, I pulled a broadband before, it is Netcom, and said that it is broadband, I bought a year's service, and then I used it for half a year and didn't use it, because its network speed is too rubbish, open a web page, it takes more than 30 seconds to open, the data is lost too much, so angry that you want to **, and then I used it for half a year and I don't need it, broadband does not need to dial the number, there is no so trouble, it is a dedicated line, the minimum traffic is more than 1bm, You can go directly to the Internet with a username and a dedicated line! If you dial the number, there is only 56kb speed, and you can't afford to bring you three machines to the Internet, 56kb one Internet access is enough, compared to watching movies on the Internet, you can't see more than 100kb, intermittently.

Shenzhen's broadband is 100 yuan a month for 1 megabyte, and the 2 trillion ADSL network express is 1440 yuan a year, and the network speed and traffic are stable.

Detailed situation, you can dial the national free service **10000, to China Telecom is free, you will soon be reported to someone to install for you, the service is also good, broadband Internet access, enjoy high-speed life!

China Telecom's better, 1444 yuan a year, what costs are included in it, (Shenzhen) different places, as the world's top 500 enterprises, China Telecom, will not mess around, China Telecom is service is service first, customer first, attentive service, but your router is not packaged, you can get it yourself, China Telecom will send you a cat with Internet access, nothing else,

Our dormitory is also connected to three units, because it cannot be connected to the campus network, and relatively speaking, the speed of the telecom network is faster, so we have to take the telecom, first to apply for an account, pay a deposit, but it is said that three times to upgrade. Then buy a router, three network cables, and set up something in between, and the telecom and broadband sellers will help you get it!

As long as you have RMB

Telecom, Netcom, Tietong, Unicom... Any one of them will help you solve the problem.

Don't think about it that much.

Call ** to 10000 to ask Telecom to see!

(t*2-1 1-2t+t*2) (t+1 t-1) times (1-t t+1).

I'm taking t*2 as t

of the square.

If that's what it means.

Then look at the answer.

Original = [(t-1)(t+1) (t-1)(t-1)] (t+1 t-1) times (1-t t+1).

t+1 t-1) (t+1 t-1) times (1-t t+1) = 1 times (1-t t+1) = 1-t t+1

Because the denominator cannot be 0

So t is not equal to -1

You can bring in 0 or 1.

fractional t1?

This one is more expensive

Ordinary 100 200 knives Complete 400 knives

It supports 128 kbps Mbps two-way transmission over a dedicated line consisting of 24 channels.

Factory reset the wireless router you are using, and then set it up again. You must add a password, otherwise someone will find the signal connection, which will greatly affect the Internet speed of your wireless device!