ZETRON 2000 Series Especificaciones descargar pdf (Pagina 189)

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Possible Restrictions on Node Address Values

If you subscribe to one of the satellite-distributed TNPP services, such as Network USA or

Sports Page, or intend to subscribe to such a service in the future, you should take some

care when assigning primary or secondary node addresses. These services use sets of

preassigned, and already in use, node addresses for setting up subsets of services. As an

example, Network USA uses node address to group pages as being directed to a state, a

time zone, or the entire area covered by the satellite. Outside of the Network USA

maximum coverage destination address of DE00, this service seems to have used

destination addresses in the hundreds.

Even if you should have such node address collision, using named regions minimizes the

impact of the collision. All that is needed is to change the small amount of programming

that maps the network, no subscriber records need be changed.

When two existing networks are connected together, there is a chance that there will be

node address overlaps or “collisions”. There are several possible solutions to this problem.

If named destinations have been used then it is practical to renumber node addresses, as

this will usually involve the editing of no more than a few dozen lines. In some cases it is

also possible to program the Series 2000 to “remap” the destination node addresses on

packets being exchanged by the networks. This works best when the networks are

connected at a single point, where there is a single link between a pair of terminals, one in

each existing network.

Capcode Paging As Opposed To Subscriber ID Paging

Besides deciding on the network topology and coverage regions you need to determine if

you will use capcode paging, ID paging, or a mixture of the two. Each type of network

paging has applications where it has various advantages over the other.

With capcode paging the network page includes a description of the pager that is to

receive the page. Each terminal that is to transmit the page need only convert from the

TNPP CAP format to the proper pager encoding (tone sequences or binary data) to

activate the pager. Only the terminal that originates the page, creating it as the result of a

phone call, needs to have a subscriber record describing the pager.

Because capcode paging directly describes the pager, it avoids having to have a subscriber

description at each terminal. For the same reason, it is not possible to “filter” or restrict

capcode pages received from the network. Once you have elected to accept capcode pages

addressed to some node address, optionally with some selection of the TNPP channel and

zone values, you have decided to transmit any capcode page that comes in from the

network that has that destination.

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ZETRON 2000 Series Especificaciones Pagina 189