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Message: <blockquote data-quote="Kingrasmy" data-source="post: 17252039" data-attributes="member: 178634">WHICH MODEL ???<img src="/styles/default/xenforo/smilies/default/rolleyes.gif"  class="smilie" loading="lazy" alt=":rolleyes:" title="Rolleyes    :rolleyes:" data-shortname=":rolleyes:" />HUAWEI E392u-21 and E392u-92 4G LTE TDD USB ModemAs 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 Mhz3G UMTS: 900/2100MhzHUAWEI E392u-21:4G LTE Bands: FDD 2600MHz/ TDD 2600Mhz3G 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.</blockquote>

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