X25AM Programming Manual

Introduction
X25AM Programming Manual—527201-001
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Annex G CCITT-Specified DTE Facilities
•
The Incoming Call transit delay value
X25AM does not include a transit delay value in the Call Accepted packet.
SETPARAM 36 sets or gets the transit-delay dynamic value.
Annex G CCITT-Specified DTE Facilities
These facilities are used to determine how to select the subdevice on a called and
calling address extension facility.
X25AM updates the dynamic DTE facilities values when an Incoming Call or Call
Connected is received.
X25AM includes the dynamic DTE facilities values when it sends a Call Request or
Call Accepted.
Call Redirection Notification Facility
When an Incoming Call is received, X25AM updates the dynamic values containing the
DTE address and the reason for redirection or deflection. If the incoming call has a
redirection length of less than two digits, X25AM will clear the call and respond with
diagnostic code 69 (invalid facility/registration length).
Modified Called Line Address Notification Facilities
When a Call Connected is received, X25AM updates the dynamic values containing
the reason the called address was modified.
Other X25AM Connection Methods
Two other protocols can be used to communicate with an X25AM process:
•
NAM, which is used for Expand-Over-X25AM connections
•
QLLC, which is used for SNA-Over-X25AM (also called SNAX/XF) connections
Expand-Over-X25AM
Expand devices can be linked through an X.25 network using the NonStop Kernel
protocol NAM over switched or permanent virtual circuits (SVCs or PVCs). PVCs and
SVCs are typically used for Expand connections when leased lines are not available.
Note that user applications do not use the NAM protocol.
An Expand process usually manages the line. However, when an SVC or PVC is used,
the Expand process is configured to communicate with an X25AM process that
manages the line.
For more information about Expand and the NAM protocol, refer to the Expand
Configuration and Management Manual.