Premisys 600, Reference Manual

Page: 129 / 240

Server Cards 5-19
ISDN-PRI Card ISDN-PRI Card User Screens and Settings
5.3.5 Assigning Interface Identifications
Each ISDN facility (interface) that terminates at the user’s premises is assigned a unique Intf.
ID (interface identification) by the carrier. Whenever the system signals the carrier switch on
the D channel, it uses the Intf. ID(s) assigned by the carrier to tell the switch to which facility
(interface) it is referring.
Note: In the unlikely (but possible) event that a single facility is split between two carriers
(i.e., two D channels each controlling some of the B channels on that facility), it is
possible that the same facility (interface) will have two different interface IDs–one for
each carrier. Thus, the list of interface IDs is unique to a specific D channel only, but
may be repeated across different D channels.
Figure 5-9 shows the Interface Identification subscreen. This subscreen is accessed by placing
the cursor in the column of the desired D channel, then pressing “i”. The list of all interfaces
(WANs) then appear with their assigned interface IDs. The default value is 99, which means
“interface ID not yet assigned.” Values for the Interface ID are 00-31 and 99.
You must assign an interface ID to any WAN link that will contain B channels before you will
be able to assign the specific B channels to that facility. If you assign a B channel to a WAN
that is not assigned an Interface ID, the system message, "Intf.ID must be uniquely identified,"
will appear when you try to activate the D channel.