Datatek DT-4180 - Manual (Page 35)

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04/09/09
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5.3.1 IP Originating Ports
User ports designated as originating, using the port command, are used to establish
connections to endpoints on the IP network. A predefined destination (PDD), in the form
of a destination IP address and TCP port number, is required for a user port configured
for a synchronous protocol. A PDD is optional for an asynchronous port.
For asynchronous ports, operation from the perspective of a user is determined by
whether or not a PDD has been specified. An originating user port which has a PDD
associated with it will have that connection automatically established when the user
device goes “off hook”, i.e., signals DTR, or when the user sends the attention
sequence. If no PDD has been specified, the calling user is instead greeted with a xxxx
Destination> prompt where xxxx is the actual product number. The user would then
enter the destination IP address plus TCP port number desired. If no TCP port number is
entered, the telnet default (23) is used. The user also has the option to enter a
mnemonic host name previously administered into the unit’s host table. The session is
terminated when the calling user types the attention sequence.
If a Domain Name Server has been defined on the unit, the calling user may also enter a
fully qualified destination name (e.g. “server.ab.company.com”) to be resolved. It is also
possible to override the TCP port while still resolving the IP address. For example, the
dial string “server.ab.company.com 50030” selects TCP port 50030 and then asks DNS
to resolve “server.ab.company.com” to an IP address.
An originating port optioned for one of the supported synchronous protocols should be
configured as a permanently active port (PAP), and also have a PDD specified. This will
cause the desired connection to be established as soon as the port is restored to
service.
The following example command sequence would set up an originating user port that
would allow the connected endpoint to “dial” other endpoints in the IP network. It will be
configured for 9600 baud, 8 bits, no parity, and no PDD defined. It will default to
asynchronous operation. Assume the unit is already configured for IP networking, and in
service.
<4280>
port 2 type=orig baud=9600 dbits=8 parity=none
↵
<4280> restore port 2
↵
5.3.2 IP Receive Ports
A unit is accessible from anywhere in the IP network via a single IP address. That is the
address administered using the
local command, as previously shown. At this address,
each user port configured as receive, using the port command, “listens” on a configured
TCP port for the arrival of an incoming call from somewhere in the IP network. Once a
call is established, the telnet over TCP protocol is used for transport. A hunt group may
be established, by assigning the same TCP port number to more than one receive user
port. Ports included in a given hunt group do not need to be contiguous.