Tiered Networks 13-11
IGX Routing Hubs in a Tiered Network
• Remote printing by the interface shelf via a print command from the routing network is not
supported.
The following applies to voice and data connections over IGX interface shelves:
• 3-segment connections are supported, that is: originating IGX interface shelf data or voice card
to IGX routing hub, across IGX intermediate nodes, as applicable, to IGX routing hub, to
terminating IGX interface shelf data or voice card.
• 2-segment connections are not supported, (IGX interface shelf voice or data card to routing hub).
• Routing through the middle segment of the three segment connection is done via IGX routing
nodes using CBR mode and simple gateway over the IGX trunks.
• Connection statistics are supported at user endpoints only.
• Adaptive voice is not supported.
The following applies to Frame Relay connections over IGX interface shelves via an IGX hub.
• 3-segment connections are supported, that is: originating IGX interface shelf frame relay card to
IGX routing hub, across IGX intermediate nodes, as applicable, to IGX routing hub, to
terminating IGX interface shelf data or voice card.
• 2-segment connections are supported, (IGX interface shelf frame relay card to routing hub).
• Routing through the middle segment of the three segment connection is done via IGX routing
nodes using ATFR mode and simple gateway over the IGX trunks.
• Connection statistics are supported at user endpoints only.
General
Annex G, a bi-directional protocol, defined in Recommendation Q.2931, is used for monitoring the
status of connections across a UNI interface. Tiered Networks use the Annex G protocol to pass
connection status information between a Hub Node and attached Shelf.
