Connected devices, up to
The largest number of devices that can be simultaneously connected to the modem via Wi-Fi (see "Connection").
The presence of this limitation is due to the fact that processing network requests from several devices at once requires a fairly large amount of computing resources, and there are not so many of them in miniature electronics like wireless modems. However, even inexpensive models can support about 5 – 6 devices, which is more than enough for most cases; and in more advanced modems, this number can reach 10.
Communication generation
The generation(s) of mobile networks supported by the modem.
Note that this spec is rather conditional and generalized, since one generation usually includes several data transmission technologies (see below), and the set of these technologies may vary in different mobile networks and in different modems. Therefore, it is possible to evaluate the compatibility of a device with a specific cellular network using this parameter only approximately. Nevertheless, generation data may well come in handy at the preliminary selection stage: they allow you to at least select the generation you are interested in and then search further among models that are compatible with it.
As for specific generations, today they are as follows:
—
2g. Communication standards of the second generation implemented through mobile networks of the GSM standard. Support GPRS and EDGE transmission technologies. Due to low bandwidth, today they are considered obsolete and are gradually being replaced by the next generations of communication. However, this process is uneven, and in some countries 2G is still the main mobile standard (although everything is moving towards changing this situation). Also note that even the introduction of newer standards does not mean the replacement of GSM — many operators keep this technology as a spare and intended for the simplest mobile phone models. Actually, the second generation in its pure form is pract
...ically never found in cellular modems — it complements more advanced standards.
— 3G. Communication technologies of the third generation. Includes W-CDMA, HSUPA, HSDPA, and HSPA+ technologies, and in CDMA networks, EV-DO Rev.A and Rev.B. Significantly outperforms second-generation standards in terms of both pure throughput and additional features. And the data transfer speed itself can be comparable to that of a fixed wired Internet connection, which allows you not only to comfortably browse the web, but also use video calls, listen to streaming audio, etc. However, in fact, the quality of communication depends both on the specific technologies used, on the signal level, and the workload of base stations, etc.
— 4G. The fourth generation of communication, the most advanced to date. It includes WiMAX and LTE technologies, which significantly exceed not only 3G standards in terms of data transfer speed, but also the usual fixed wired Internet connection via Ethernet. However such a connection is not cheap.4G (LTE)
The 4G (LTE) mobile connection speed supported by the modem.
All modern LTE equipment is assigned one or another category (
Cat.3,
Cat.4,
Cat.6,
Cat.7,
Cat.9,
Cat.12,
Cat.13,
Cat.16,
Cat.18,
Cat.19,
Cat.20,
Cat.22), on which the transmission speed directly depends. This paragraph specifies both this category and specific speed indicators, moreover, in two parameters — for reception and for transmission. The transmission speed is always much lower, but given the specifics of mobile Internet access, this is usually not critical.
Note that equipment with different speed categories will be quite compatible with each other, however, the throughput will be limited by the capabilities of the slower device. It is also worth saying that this paragraph indicates the theoretical maximum; practical amounts can be noticeably lower (depending on the quality of the network coverage and the features of specific electronics). However, a modem with a higher speed category will perform faster in fact.
Ports
—
USB plug. The presence in the design of the modem of its own USB plug, which allows you to connect the device to a computer directly. Such a connection provides a device with a USB port with Internet access, and the power necessary for the operation of the modem is also supplied via USB.
—
microUSB. A smaller version of the USB connector (see above), used primarily in Wi-Fi modems (see "Type") that can work autonomously and do not require a constant connection to another device. At the same time, in 3G/
4G modems, microUSB usually looks like a socket, not a plug, and a special cable is used to connect. This interface usually plays the role of a general-purpose service connector: the battery is charged through it, and it is also connected to a PC or other device to manage settings, update firmware, etc.
—
USB. Wired interface, the most common and universal modern standard used to connect peripheral equipment to various electronic devices, ranging from computers to smartphones and even wireless modems. In this case, the full-size version of the USB connector is meant. It is usually installed in classic modems (see "Type") and has the form of a plug, with which the modem is connected to a control device (PC, laptop, tablet, etc.). Power is usually supplied through the same connector.
—
...>USB-C. Connector, in its functional features similar to the paragraph above. With the exception of the symmetrical form factor and the use of more modern technologies.
—
LAN (RJ45). Classic wired connection via a cable with an RJ-45 connector. Also known as "LAN". Nowadays, it is one of the most common methods of wired Internet connection, and is also widely used in local networks. With it, you can connect a laptop or PC directly to the modem via a cable and not bother with a Wi-Fi connection. In addition, such a connection can be faster (depending on the speed of the LAN).
— ExpressCard. A connection interface mainly used in laptops. Peripheral devices of this standard, including wireless modems, have the form of cards, when connected, they are installed in a special slot in the device. It should be taken into account that there are two ExpressCard form factors — 54 mm and 34 mm, and 34 mm cards can be used without restrictions with 54 mm slots, but not vice versa. Therefore, when choosing such a modem, it is worth clarifying the correspondence of its form factor to the planned slot. However, this standard is gradually disappearing from the scene, being replaced by more advanced interfaces — in particular, USB 3.0.
SIM card slot
The presence
of a slot for a SIM card in the design of the modem. The abbreviation SIM stands for Subscriber Identification Module, and this is the main purpose of these cards — binding the device to a specific subscriber account (personal account, mobile number, etc.). Note that in this case, the term SIM refers to both the original cards of this standard used in GSM networks, and USIM used in 3G W-CDMA networks (with all relevant add-ons, see "Transmission Technologies"). The presence of a SIM slot is mandatory for modems that support the mentioned communication technologies — they practically do not use firmware for binding to the operator's network.
Battery capacity
The capacity of the battery installed in the modem with the corresponding type of power supply (see below).
The higher the capacity, the longer the battery is able to work without recharging, all other things being equal. However, note that the situation of "other things being equal" is almost not found in modern wireless modems. First, different data transmission technologies (see above) have different power consumption; secondly, even models supporting the same standards can differ in power consumption (and battery life) due to design differences. Therefore, this indicator in most cases is purely reference information, and even very similar models can only be compared approximately. When choosing, it is worth focusing primarily on the claimed specs of the battery life (see below).
Operating time (internet browsing)
The maximum operating time of the modem with battery power (see "Power") on a single charge in Internet browsing mode. Such power is typical for Wi-Fi routers, therefore, usually, Internet browsing is supposed to provide access to the World Wide Web for an external Wi-Fi device.
This spec is the main indicator of battery life for any battery-powered modem, because it describes the time of using it for its main purpose without recharging. At the same time, you should know that this indicator is measured under certain "perfect" conditions; the actual operating time depends on a number of factors, including the intensity of browsing, the amount of data transferred, the number of connected devices and the distance to them, the cellular network signal strength, etc. Therefore, in fact, the battery life of the modem may be somewhat lower. Nevertheless, it is quite possible to compare different models with each other according to the operating time stated in the specs.
Power bank feature
Possibility of modem performing in
power bank mode. This mode allows you to use the built-in battery to power your smartphone or other external gadget. Thus, the modem can be an additional external battery, which is important in situations where it is not possible to charge a portable device.
