Eicon Networks ISDN NT1 Especificaciones descargar pdf (Pagina 9)

In the diagram below, the two users are connected using two B channels in parallel. The

ISDN is able to route these B channels independently, because it takes no account of the

fact the both channels connect the same pair of users.

The speed of the two B channels is identical.

The time it takes for data to travel from one end of the channel to the other is, however,

different.

One user transmits two items of data simultaneously. One is sent in the B channel which

is routed via satellite; the other is sent in the B channel which takes the direct route. Will

both items of data arrive at the same time?

The item of data which travels down the most direct path will arrive first. That which goes

via satellite will arrive later because it has further to travel.

The ISDN makes no attempt to synchronise the data on the two B channels, possibly

because it doesn't understand what the protocol in use. The two B channels are operating

independently - the ISDN doesn't care that they're both connecting the same two users.

If the blue data item and the red data item together comprise a logical entity (eg. a picture

on a web page), the receiving user cannot use the blue item until the red item has also

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Eicon Networks ISDN NT1 Especificaciones Pagina 9