DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-866PE-BCHL (PRI Endpoint Port)
3
Multiple PRI Endpoints on a one line-side fac ility are separate and distinc t within
the facility. Non-overlapping c ontiguous sets of B-channel s are associated with
each PRI Endpoint, and the endp oint equipment is expec ted to initiate calls
within these boundaries.
The endpoint applic ation equipment must b e able to do the following : use
standard ISDN-PRI signaling, adhere to the PRI Endpoint boun daries as
administered on DEFINITY when initiating calls, and hand le incoming call s
appropriately b ased on the PRI Endpoint.
Signaling and B-channel States
These ports use a separate channe l for signaling (for examp le, for call setup).
This mode of operation is known as out-of-b and signaling. The sep arate
signaling channel is called a D-channel i n ISDN terminology, and it carries all the
call control signaling messages for the PRI Endpoint Port B-channels. The
D-channel for these B-channels is an ISDN-PRI Signaling Link Port (ISDN-LNK).
The signaling protocol used on the ISDN-PRI Signaling Link Port D-channel is
defined by one of the four sel ectable ISDN-PRI Specifications: AT&T, CCITT,
ECMA, a nd AN SI.
The ISDN -PRI Spe cif icat ion d efin es the poss ibl e SERVICE STATES for a
B-channel. The service state is negotiated with the far-end terminal adap ter, and
it changes over time. Also, the servic e state may have a far-end or near-end
component, and it is initialized to the Out-Of-Service/Far-End state. An attempt is
made to negotiate the service s tate to In-Service.
NOTE:
The service state of a particular PRI Endpoint Port B-c hannel can be
displayed by issuing the status pri-endpoint <extension> system
technician command.
If a call is present, the ISDN-PRI Specification def ines the permissible CALL
STATES as well. There are tests in the short and long test sequences for PRI
Endpoint Port that are designed to audit these states and to ensure ag reement
between both ends of the PRI wideba nd connection.
Alarming Based on Service States:
A PRI Endpoint Port B-channel is alarmed with a WARNING if it is placed into a
Maintenance/Far-End or Out-Of-Service/Far-End state. While in such a state, the
port is unusable for c alls to the terminal adapter. Howev er, the user can still use
the other remaining ports in the PRI Endpoint to make c alls to and from the
terminal adapter. When a WARNING alarm is raised, the status pri-endpoint
<extension> command should be used to deter mine the exact state of the port.
Other alarms can be di agnosed by using the short and/or long test seq uences.
Note that a PRI Endpoint Port B-channel can be p laced into a Far-End Service
State either by direct action of th e far-end terminal adap ter or by inaction of the