Modemulator User Guide
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72
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113
What type of screwdriver do I need for installing a SIM or an expansion card?
The gateway base unit panels are fastened by Torx T6 screws, so a Torx T6 screwdriver is required to
remove a panel. Torx is the tip style, and is also called “star” or “6-point”. T6 is the tip size.
What is peer-to-peer?
Peer-to-peer is a communications model in which each party has the same capabilities and either party
can initiate a communication session. Peer-to-peer devices are capable of originating or answering a
connection. Dial-up modems are an example of a peer-to-peer device.
What is point-to-point?
Point-to-point is a type of communications connection in which one device has an exclusive connection
with one other device. The Public Switched Telephone Network (PSTN) is an example of a point-to-point
network. An RS-232 serial link is another example.
Can I enable both Caller ID Screening and Password Prompting?
Yes. With Caller ID Screening and Password Prompting both enabled, a Modemulator connection will first
validate the originating Modemulator with Caller ID Screening, then prompt for a password. If either
authentication fails the connection will not complete.
Can I enable both Caller ID Screening and Dialback Security?
Yes. With Caller ID Screening and Dialback Security both enabled, a Modemulator connection will first
validate the originating Modemulator with Caller ID Screening, then prompt for a dialback number. If
either authentication fails the connection will not complete. When it does complete successfully, it will only
connect to an IP address listed in the Answerer’s phone directory.
Why does an originating Modemulator report
BUSY
?
Cellular data networks are packet-switched networks, and packets can be significantly delayed when
travelling large distances from one Modemulator to another. One reason an originating Modemulator can
report
BUSY
is when the total network delay exceeds the Modemulator busy timeout. Increasing the
originating Modemulator’s S7 setting may help by increasing the busy timeout.
Can I connect to the IP address reported by the USR3520/USR803520?
When the cellular service is provided by a Mobile Network Operator (MNO), the IP address reported by the
USR3520/USR803520 GUI or I7 screen may be public and routable. Normally this IP address provided by