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MTU
SPECTRE Configuration Manual
with a PIN to prevent unauthorized access)
(Maximum Receiving Unit) – The maximum packet size that can be
received in a given environment. Default value is 1500 bytes. Other
settings may cause incorrect transmission of data.
(Maximum Transmission Unit) – The maximum packet size that can be
transmitted in a given environment. Default value is 1500 bytes. Other
settings may cause incorrect transmission of data.
Table 14: GPRS connection configuration
If the IP address field is not filled in, the network operator will automatically assign an
IP address when the connection is established. If a static IP address is supplied by the
operator, the time required to connect to the network will be reduced.
If the APN field is not filled in, the router will automatically select the APN based on the
IMSI code of the SIM card. If the PLMN of the cellular carrier is not in the APN list, then
default APN is “internet“. Contact your mobile operator to determine if the APN information
must be entered.
Access to the SIM card may be blocked if the PIN code for a locked SIM is entered
incorrectly. Contact technical support if your SIM card becomes blocked.
If only one SIM card is installed in the router, the router switches between the APNs on
the SIM card. A router with two SIM cards switches between SIM cards.
The items marked with an ‘*’ should only be entered if they are required by the cellular
network operator. If the router is unable to establish a PPP connection, verify that the
network settings have been entered correctly. You may also try a different
authentication method or network type.
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SPECTRE_Configuration_Manual_2912m
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