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Comparison Alcatel IK40V vs ZTE MF825

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Alcatel IK40V
ZTE MF825
Alcatel IK40VZTE MF825
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Device typeUSB modemUSB modem
Connection
Communication generation
2G
3G
4G (LTE)
2G
3G
4G (LTE)
4G (LTE)Cat.4 (150/50 Mbps)Cat.4 (150/50 Mbps)
Transmission technology
GPRS
EDGE
W-CDMA
HSUPA
HSDPA
HSPA+
LTE
GPRS
EDGE
W-CDMA
HSUPA
HSDPA
HSPA+
LTE
Ports
USB
USB
Features
External antenna connector
MIMO antenna connection
Memory card slot
 /microSD/
 /microSD/
SIM card slot
General
Dimensions88x28x11 mm90x28.4x13 mm
Weight40 g60 g
Added to E-Catalogapril 2019january 2015

External antenna connector

The presence of a connector for an external removable antenna in the modem design. The meaning of all external antennas is described above; here we note that the connector makes it possible to use rather large antennas with the modem, which significantly exceed the capabilities of stock antennas (both internal and external non-removable ones). In addition, the user can choose the antenna at his discretion.

MIMO antenna connection

The ability to connect the MIMO antenna (the antenna itself, usually, must be purchased separately).

MIMO technology is used in Wi-Fi communications, as well as in 4G LTE networks (starting with Cat.2). Its general principle is to split the transmitted signal into several transmitting and receiving antennas; at the same time, each of the transmitting antennas broadcasts a signal to all receiving antennas at once (or at least to several of them). This format of operation allows more efficient use of the frequency range, increases the actual data transfer rate, and also increases resistance to interference. But antennas for MIMO are rather bulky, in the case of modems it is difficult to make them built-in; and such feature is required not so often. Therefore, separate external antennas are used to work with this technology.

Note that even in portable Wi-Fi hotspots (see "Type"), this feature is used exclusively for 4G/LTE; Wi-Fi connection is provided by built-in antennas.
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