Eicon Networks ISDN NT1 Specifiche Scaricare il pdf (Pagina 31)

In this case, the device which currently has no address is able to request one from the

network. The network responds with an address for the device which it will use for all

future communications.

TEI assignment - potential problems

Problems will arise if the line is configured to expect a fixed address device, and the

device connected is expecting to be allocated an address.

In this example, the network will attempt to activate device 0, which doesn't exist. The TE,

which currently has no address, ignores this activation request because the address

doesn't match his own. It waits for the allocation of a dynamic address. The net result of

this is that the communication between the network and device is never initialised.

Broadcast address

In addition to fixed and dynamic addresses, there is also a universal address. This

broadcast address is used when a message has to be heard by all devices sharing a given

D channel.

Messages sent by the network to the broadcast address are heard even by devices

currently without an assigned TEI.

Broadcasts are mainly used by the network to signal an incoming call - that way, any

device connected to the line can take appropriate action - an ISDN telephone can ring, a

TA could make attached analogue phones ring, or a device could decide to answer the

call.

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Eicon Networks ISDN NT1 Specifiche Pagina 31