The Modem tab allows configuration of modem-specific settings for better connection, hardware, and functional control of the modem.
Modem Connection Mode – Specify how the modem should connect to the network.
Auto (all modes) – Let the modem decide which network to use.
Auto 3G (3G or less) – Let the modem decide which 2G or 3G network to use. Do not attempt to connect to LTE.
Force 4G – Connect to 4G (LTE) networks only. Do not attempt to connect to 2G, 3G or 5G networks.
Force 3G (EVDO, UMTS, HSPA) – Connect to 3G network only.
Force 2G (1xRTT, EDGE, GPRS) – Connect to 2G network only.
Carrier Select – Select the modem firmware load to match the SIM that will be used in the modem. “Automatic” will detect the carrier and load the matching modem firmware for the SIM, if available. The available modem firmware can be modified in System > System Control > Modem Firmware.
Automatic – Selected by default
Generic
AT&T
Verizon
T-Mobile
Sprint
Telstra
Bell
Vodafone
NAmerica
EuAPAC
Enable Aux Antenna – (Selected by default.) Enable or disable the modem's auxiliary diversity antenna. This should normally be left enabled.
Enable GPS – Enable or disable GPS support for modem.
GPS Signal Source – Select the antenna to be used for receiving GPS coordinates. Some products support a dedicated GPS antenna, while others use the auxiliary diversity antenna only (and some products support both).
Network Selection Mode – Wireless carriers are assigned unique network identifying codes known as Public Land Mobile Network (PLMN). To manually select a particular carrier, select the Manual radio button and enter the network PLMN. Choose from the following options:
Auto – Selected by default.
Home Only – Allows connection to the home carrier of the inserted SIM. Does not allow roaming to any other network.
Manual – Input the PLMN code.
Smart – Select a Minimum RSSI. If the signal drops below the minimum, then a new PLMN is searched for automatically.
Enable eHRPD – (Default: selected) Enable or disable the modem's ability to connect through enhanced High-Rate Packet Data (eHRPD) when connecting to a 3G EVDO network on Sprint. eHRPD routes EVDO traffic through the LTE systems, enabling easy transitions between LTE and EVDO. In rare cases, it may make sense to bypass the LTE core, so this field allows you to disable eHRPD.
Network-Initiated Alerts – This field controls whether the Sprint network can disconnect the modem to apply updates, such as for PRL, modem firmware, or configuration events. These activities do not change any router settings, but the modem connection may be unavailable for periods of time while these updates occur. The modem may also require a reset after a modem firmware update is complete.
Disabled – The request to update will be refused.
When Disconnected – The request to update will only be performed when the modem is either in a disconnected state or dormant state. If the modem is not in one of these states when the request is received, then the router will remember the request and perform the update when the modem becomes disconnected or dormant.
On Schedule – The request to update will only be performed at the specified scheduled time, no matter what the state of the modem is.
Functional Mode – Selects the functional mode of the modem. IP passthrough (IPPT) mode causes the modem to act as a transport, passing internet data and IP address information between the modem and the internet directly. NAT mode causes the modem to NAT the IP address information. Consequently, IPPT mode does not allow user access to the modem web UI and NAT mode does allow user access to the modem web UI.
IPPT
NAT
Show Advanced Settings – Select this option to modify the following:
IP WAN Subnet Filter – This feature filters out any packets going to the modem that do not match the network (address and netmask).
Carrier Aggregation – Enable or disable carrier aggregation.
5G Standalone – Enables 5G Standalone (SA) mode for modem/carrier combinations that support it. The 'no change' option will use the default behavior for the modem/carrier.
DHCP Relay Mode – If enabled the interface will forward on DHCP requests and responses.
Voice Reject Mode – Process indicates that a voice call is answered, Reject indicates that the call is immediately rejected, and Ignore indicates that the call is left ringing and is ignored.
Extend Connect Delay – The number of seconds to continue connection attempts before suspending.
Aggressive No Carrier – If enabled, a "no carrier" condition signals the modem to immediately restart scanning for better cellular registration conditions.
Enable Band 30 – Select this to enable use of Band 30.
Over-the-air APN Selection – Allow the use of an OTA (over-the-air) method to gather network-provided APN.
Enable Bands 25, 26, and 41 – Select this to enable use of 25, 26, and 41. Under certain conditions these bands have been shown to interfere with T-Mobile bands and cause problems with modem connectivity. Generally only deselect this when instructed to do so by technical support.
Enable Band Masking – Select this to allow custom configuration of disallowed cellular bands.
Warning
Disallowing bands may affect network connectivity, including connection instability or complete loss of cellular connectivity. This feature should only be used when working with a cellular operator for a specific and approved reason.