Avaya Communication Manager Administrator's Manual page 536

Managing Data Calls
Access endpoints
Access endpoints are non-signaling trunk ports. They neither generate signaling to the far-end
of the trunk nor respond to signaling from the far-end. Designate an access endpoint as the
originating endpoint or destination endpoint in an AC.
Typical AC applications
The following are typical AC applications:
A local data endpoint connection to a local or remote-access endpoint. Examples: an
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MPDM ACCUNET digital service connecting to SDDN via an ISDN trunk-group DS1 port;
an MPDM ACCUNET digital service connecting to an ACCUNET Switched 56 Service via
a DS1 port.
A local-access endpoint connecting to a local or remote-access endpoint. Examples: a
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DSO cross-connect and a 4-wire leased-line modem to a 4-wire modem connection via an
analog tie trunk.
A local data endpoint connecting to a local or remote data endpoint such as a connection
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between two 3270 data modules.
Note:
The following guidelines do not include AAR and ARS, or GRS administration
Note:
information for routing AC calls over trunk groups. See the respective feature
elsewhere in this book for that information.
Establishing Administered Connections
The originating server or media server attempts to establish an AC only if one of the following
conditions exist:
AC is active.
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AC is due to be active (either a permanent AC or time-of-day requirements are satisfied if
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it is a scheduled AC).
Originating endpoint is in in-service or idle state.
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If the originating endpoint is not in service or is idle, no activity takes place for the AC until the
endpoint transitions to the desired state. The originating server uses the destination address to
route the call to the desired endpoint. When the server establishes two or more ACs at the
same time, Communication Manager arranges the connections in order of priority.
AC attempts can fail for the following reasons:
Resources are unavailable to route to the destination.
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A required conversion resource is not available.
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536 Administrator Guide for Avaya Communication Manager