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28/02/2013

HUAWEI E392u-21 and E392u-92 4G LTE TDD USB Modem

As one of the top telecom equipment supplier, Huawei has been leading the trend of 4G network. To meet the demand for network upgrade, many 4G LTE modems are released with new LTE technology. TDD, as the one of the two most popular LTE technologies, is widely adapted for 4G network in many providers all over the world.

    Huawei E392u-21 and E392u-92 are born to support TDD networks. Even though there are many variants for Huawei E392 or Huawei E397, Huawei E392u-21 and E392u-92 should be the most popular two models, because HUAWEI E392u-21 and E392u-92 both support 4G TDD band 2600Mhz, what’s more, HUAWEI E392u-92 supports TDD 2300MHz. What’s more, HUAWEI E392u-21 also supports 4G FDD 2600MHz.

   

 

Actually, the 4G Spectrum TDD 2300/2600MHz and FDD 2600MHz are the most popular bands which are commonly deployed and launched to commercial. So the difference between the two 4G LTE dongles is the 4G Frequency band supported. Below are the details of 4G Frequency they could support:  

 

HUAWEI E392u-92:

* 4G LTE bands: TDD 2300/2600 Mhz

* 3G UMTS: 900/2100Mhz

 

HUAWEI E392u-21:

* 4G LTE Bands: FDD 2600MHz/ TDD 2600Mhz

* 3G UMTS: 900/2100Mhz  

 

Unlike HUAWEI E392u-21, HUAWEI E392u-92 could only work on 4G LTE TDD network. Since then, HUAWEI E392u-21 may support high link speed than E392u-92. Under FDD network, HUAWEI E392u-21 could reach peak download data rate at 100Mbit/s and upload data rate up to 50Mbps. But the maximum speed for HUAWEI E392u-92 to download is 68Mbps while upload peak speed is 17Mbps. When working on TDD network, HUAWEI E392u-21 could also run at this speed.  

 

HUAWEI E392u-92 is somewhat like ZTE MF820T, but it seems HUAWEI E392u-92 is better because E392u-92 works on multi-mode, 3G & 2G network are backward while ZTE MF820T is single mode for 4G LTE TDD 2300/2600MHz. And with external antenna connector, HUAWEI E392u-92 would get high data rate in practical with MIMO antenna.

   

 

With the same compact design, HUAWEI E392u-92 and E392u-12 both have 2 external pigtail connectors. With MIMO technology, the transmission rate for data would improve obviously whenever in laboratory or practical usage.  

 

It’s a pity that HUAWEI E392u-21 couldn’t support 2300MHz, which let E392u-92 has its special features. They both work for 4G TDD network and both are good 4G dongles worthy to have if there is 4G TDD network available round you.    

27/02/2013

ZTE MF880 and MF820T 4G LTE TDD USB Modem

As one of the most important 4G vendors, ZTE has released many 4G LTE modems. ZTE MF820T and MF880 are two of the popular TDD models.  

 

Just like other 4G LTE modems from ZTE, ZTE MF880 and MF820T followed the same design as ZTE MF820 4G LTE FDD Surf stick. The modem body is a little bit larger than usual 3G USB stick. And taking them in hand, users can feel the weight is more than 3G modems.

 

   

 

What is a pity that both ZTE MF820T and MF880 don't have the connectors for external antenna. Perhaps at the big inning when engineer designed the mode, they didn't take this factor into their blueprint. As we can see, in the serials of ZTE MF820D, MF821, MF821D, MF820S2, MF820T, MF880, they all incorporates no antenna ports. As the key features of MIMO connection, we are afraid it may not be as good as the modems with MIMO antenna for data transmission.

    

 

ZTE MF820T and MF880 both work for 4G LTE TDD network, perhaps due to for different providers, they support different TDD frequency bands as below:    

 

ZTE MF820T 4G LTE TDD Single Mode USB Modem:

* Single mode LTE TDD 2300/2600MHz  

 

ZTE MF880 4G FDD TDD USB Modem:

* FDD 800/2600MHz

* TDD 2300/2600MHz

* DC-HSPA+/HSPA+/HSPA/UMTS 2100/900MHz

* EDGE/GPRS/GSM 850/900/1800/1900MHz

   

This should the key difference between ZTE MF820T and MF880. Per current information, ZTE MF880 had need presented to public under provider "3" from UK. And ZTE MF820T should be for China Mobile. What should focus is that ZTE MF880 could also support FDD LTE band 800/2600MHz. It means MF880 could switch between FDD and TDD networks, so ZTE MF880 is somewhat like a enhanced ZTE MF820T.      

 

Regarding the data transmission speed, they both support download speed at 68Mbps and upload at 17Mbps under TDD –LTE network. ZTE MF880 seems more powerful because when working at FDD network, the peak speed could reach to 100Mbps for downlink while uplink could reach 50Mbps.  

 

In conclusion, ZTE MF880 seems more powerful than ZTE MF820T, so if you want to want buy ZTE 4G LTE TDD USB Modems, welcome to www.4gltemall.com    

24/02/2013

ZTE MF880 4G LTE FDD TDD Modem Review

ZTE had release many 4G modems, such as ZTE MF820, MF820D, MF821, MF821D, MF820T, MF820s2 and MF880 etc.. And many 4G mobile WiFi are available now on the market. Today, we get the ZTE MF880 4G Modem and we will show the details for readers. Hope you will know more about this modem ZTE MF880.

   

Logo and USB Interface  

 

The ZTE MF880 is with logo "3", which means it's customized by the UK operator "3".  

 

 

 

Like ZTE MF820, ZTE MF880 also has a rotatable USB interface; the USB could be hidden in the body of the modem. And beside the logo, there is a small indicator in oval shape, which will help users to know more about the connection status.  

 

 

 

Back  

 

On the back, the model number MF880 is printed on this modem. With the model number, there is CE number, RoHS mark and below them is the IMEI number of this modem, which is on behalf of the modem's ID. The IMEI number is printed on the back cover, unlike ZTE MF820, whose IMEI number is on a extra stick. And it also show the original produce place “Made in China”. ZTE also print its brand with this mark.

 

 

 

Inner Part  

 

Beside the indicator, there is a little cap to open the back cover of ZTE MF880. But you may take effort to open. At this point, the modem is not user-friendly. The cover is very tight. After opened the modem, you can find the SIM card at the side of the body. But there is no slot for memory card. And it’s a pity that it also doesn’t have even one external antenna connector. In 4G LTE technology, the MIMO connection is one of the most important features for high speed data transmission.  

 

 

 

Network bands  

 

According to the official files from ZTE, the ZTE MF880 4G LTE Modem could support 4G LTE TDD and FDD bands as follows:  

 

* LTE FDD DD800/2600 MHz

* LTE TDD 2300/2600MHz

* 3G UMTS 900/2100MHz  

 

 

So unlocked ZTE MF880 could support all the operators who had launched Band 20, band 7, band 40 or band 38. ZTE MF880 should be one of the LTE modems which could support TDD and FDD simultaneously. If you want to buy unlocked ZTE MF880, welcome to land www.4gltemall.com .