NetComm NTC-220 User Manual page 94

I T E M
Outgoing
connections enabled
Incoming
connections enabled
Mode
Exclusive mode (TCP
mode only)
No send delay
Keepalive
Keepalive count
Keepalive idle
Keepalive interval
Circuit switched data (CSD): The CSD (Circuit Switched Data) endpoint is designed for use when CSD
connectivity is required between equipment connected through NetComm Wireless routers. A typical
application of CSD is a dial-up connection to an ISDN service. CSD calls use the functionality of the GSM
networking and switching subsystem to carry data via GSM or later cellular networks.
In many ways, this is similar to making a voice call. When a CSD connection is established, the
communication end points are connected via a virtual circuit, similar to connections on traditional phone
network. Unlike other end points connected to a Modem emulator end point, CSD relies mainly on the
functionality of 3G/4G/LTE module. In CSD mode, the data stream of the router transparently passes
through the data and signals from the serial port to the module and vice-versa. The available data rates will
vary according to the network of the service provider. It is not necessary to have PDP profiles enabled for this
functionality, however, you may need a special SIM card with data functionality for CSD calls to be made.
Check with your service provider.
NTC-220 – User Guide
UG01028 v1.2 March 2019
Enables or disables the ability of the router to initiate outbound
network connections i.e. act as a networking client. It will attempt to
connect to the remote server when relevant activity is detected on
the serial side e.g. ATD dial command.
Enables or disables the ability of the router to accept incoming
network connections i.e. act as a networking server. When an
incoming connection from a remote client is detected, the router
simulates a dial-in call on the serial line.
Sets the IP modem to either TCP or UDP mode.
When this is off, any new client connection disconnects the previous
client connection and uses a new client instead.
Disables Nagle algorithm. Disabling this is sometimes important so
that serial data is sent as soon as possible instead of waiting for a
more optimal block of data for Ethernet. Enabling this effectively
reduces latency but increases the amount of network traffic.
Keepalive sends a message to check that the link is still active or to
keep it active.
The number of keepalive messages to send.
The duration between two keepalive transmissions when in idle
condition.
The duration between two successive keepalive retransmissions.
Table 23 – IP modem endpoint options
Figure 102 – Circuit switched data endpoint configuration
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© NetComm Wireless 2019