SmartFlex
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Item Description
Network type Specifies the type of protocol used in the mobile network.
• Automatic selection – The router automatically selects a trans-
mission method according to the availability of transmission tech-
nologies.
• It is also possible to select one of the following specific methods
of data transmission: LTE, UMTS/HSPA, GPRS/EDGE.
PIN Specifies the PIN used to unlock the SIM card. Use only if this is re-
quired by a given SIM card. The SIM card will be blocked after several
failed attempts to enter the PIN.
MRU Maximum Receive Unit – maximum size of packet that the router can
receive via Mobile WAN. The default value is 1500 B. Other settings
may cause the router to receive data incorrectly. Minimal value in IPv4
and IPv4/IPv6 mode: 128 B. Minimal value in IPv6 mode: 1280 B.
MTU Maximum Transmission Unit – maximum size of packet that the router
can transmit via Mobile WAN. The default value is 1500 B. Other set-
tings may cause the router to transmit data incorrectly. Minimal value in
IPv4 and IPv4/IPv6 mode: 128 B. Minimal value in IPv6 mode: 1280 B.
Table 23: Mobile WAN Connection Configuration
The following list contains tips for working with the Mobile WAN configuration form:
• If the MTU size is set incorrectly, then the router will not exceed the data transfer. If the
MTU value is set too low, more frequent fragmentation of data will occur. More frequent
fragmentation will mean a higher overhead and also the possibility of packet damage
during defragmentation. In contrast, a higher MTU value can cause the network to drop
the packet.
• If the IP address field is left blank, when the router establishes a connection, the mobile
network carrier will automatically assign an IP address. If you assign an IP address
manually, then the router will access the network quicker.
• If the APN field is left blank, then the router automatically selects the APN using the IMSI
code of the SIM card. If the PLMN (operator number format) is not in the APN list, then
the router uses the default APN "internet". If AT&T carrier network is detected, "phone"
is used as default APN. The mobile network carrier defines the APN.
• If you enter the word blank in the APN field, then the router interprets the APN as blank.
The correct PIN must be filled in. An incorrect PIN may block the SIM card.
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