Comdial DXP Series Installing And Using page 13

Installing And Using System-To-System Networking
Understanding The Pooled Lines Network Feature
Detailing The Line Pooling Feature
The network line pooling feature is a variation of the traditional line group access feature that is available with
stand-alone communications systems. With line pooling, a caller from one node can make outbound calls over
lines connected to other nodes in the network. The line pooling feature operates with the Automatic Route
Selection (ARS) feature to make line selections for caller's outbound calls. ARS may route calls in any of these
listed ways:
•
from a node and terminate them at the hub,
•
from one node through the hub to another node
•
internally through one node without passing them through the hub.
The system allows a maximum of two passes, or hops, through the hub. Some examples of this are listed below:
•
A call that originates at node 1, passes through the hub, routes to node 2, passes through node 2 and back to the
hub, passes through the hub again, and terminates at node 3 where it routes to node 3's central office makes two
passes through the hub.
•
A call that originates from a particular node, pass through the hub, and return to the originating node also
constitutes as two hops through the hub. (This situation exists when ARS is centralized at the hub.)
Calls that route through the network have their digits translated and or modified at the originating node, again at
the hub, and again at the terminating node before they route out of the network to the central office of the service
provider.
The Station Message Detail Accounting (SMDA) feature at the originating and terminating nodes records the
intercom number of the call originating station and marks the call with the alphabetic letters NT to denote the call
as a network call. In this report, both the ALL and LINE listings show the intercom number of remote stations.
The station class of service that sets the parameters for a calling station determines the level of call access and
call restriction at that station's node. The local node applies toll restriction to calls that originate at that node.
These toll restriction limitations are based upon the programmed class of service for that station. When a call
passes through the hub or other nodes, each location imposes the same toll restriction limitations that the
originating node imposed on the call.
The network defaults to a dial-9 for line pool access but any other digit will function equally well as an ARS
access digit when programmed to do so. The line pooling feature also supports line group selection buttons for
local line groups on individual node stations.
Understanding System-To-System Networking Features — 13
IMI89–280