Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador descarregar pdf (Página 28)

VTCPD Features User Manual

Page 28 P0602483 Ver: 03.41

VTCPD Features User Manual

Single Host Connection

The Avaya VTCPD daemon connects to a single host using the host name and TCP/IP

port number (specified as arguments on the command line). If a host name is not

specified, Avaya VTCPD is configured as a server, in which case it accepts

connections on the specified port.

The application uses the SEND function (PeriProducer resource block) to send a

message to the host and the application issues the RECEIVE function (PeriProducer

resource block) when it is expecting a response.

Multiple Hosts Connections

The Avaya VTCPD daemon can be connected simultaneously to several hosts,

provided each host is specified (on the command line) when the daemon is started.

These connections are made with no priority given to any particular host. Avaya

VTCPD sends messages on a round-robin, load-balancing basis. The round robin

system is a form of non-sequential access, in which the system maintains a list of

available Virtual Terminals (VT) and assigns the first VT in the list to the requesting

line. When the VT is freed, it is put to the end of the list. The nonsequential method

uses all the VT in the list equally.

The Avaya VTCPD assumes that each host provides equivalent services. The

application can override Avaya VTCPD and choose a specific host. The number of

outstanding requests on a given connection can be limited (if required by the host). If

Avaya VTCPD cannot send a message to a host because the specified limit is

exceeded, it returns an appropriate condition message to the application.

One Connection Per Line

Avaya VTCPD can create as many connections to a host as there are lines available. In

this type of configuration, each application has its own host connection. Message IDs

are not required (in this type of configuration) because there is only one connection

per line.

Multiple Avaya VTCPD Daemons

Multiple Avaya VTCPD daemons can be connected to one or more hosts, each

handling different message formats and services. The application uses the resource

names to identify the messages (see Specifying Which VTCPD on page 91.)

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Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador Página 28