Nortel Meridian Meridian 1 Feature Description And Administration page 896

Page 896 of 1814
553-2901-301 Standard 9.00 January 2002
ISDN PRI Central Office Connectivity
— generic status request procedure.
— support of the Extended facility information element.
• DN address translation requires the association with a customer number.
For an ETSI basic call establishment, the customer number association is
found through the B-Channel identified in the channel ID IE. For DN
address translation that is not associated with a basic call, the customer
number association needs to be determined through other methods.
For a BRI trunk DSL interface, there is a customer number association
with the D-Channel. For a PRI interface, a prompt is added for an ETSI
D-Channel configuration to create a customer number association with a
given D-Channel. This implies that bearer independent messages on a
primary rate D-Channel are associated with a single customer as
configured in overlay 17. For example, in a multi-customer
configuration, if every customer on the switch wishes to use the
bearer-independent transport service over ETSI PRI interfaces, then each
customer requires a separate D-Channel.
• The Facility Information Element (FIE) is a repeatable IE, and its length
is application dependent. However, due to system capacity
considerations, such as call register usage and real time usage, there are
two types of limitations enforced by the ETSI GF transport platform
(actually by the ISDN GF transport platform provided by the ISDN
QSIG GF development):
— the Meridian 1 ETSI GF platform supports up to a maximum of eight
ROSE components in one message.The eight components may be
included in one Facility Information Element (FIE), or multiple
FIEs. In addition, the inclusion of components in a message is also
limited by the "available message length". The available message
length is the difference between the maximum message length (260
octets), and the maximum message length taken up by other
mandatory and optional IEs supported in the given message.
— when a supplementary service requests the ISDN ETSI GF transport
to send a component which exceed the available message length or
the number of components supported, the supplementary service
will be notified.