ISDN Datasheet, PDF (11/14 Pages) Texas Instruments – ISDN Basic Rate Interface Software for the HPC16400E High Performance Data Communications Microcontroller

2 0 Functional Description (Continued)
 Connection Endpoint Suffix (CES) Allocation
TR DIGIT 0
Digit 0
 Conversion between L3 Primitives and Terminal Action
TR DIGIT STAR
Digit
The Call Control Task and the Layer 3 Controller Task com-
TR DIGIT POUND
Digit
municate via the NL DATA REQ and NL DATA IND
Primitives The messages that are supported between these
tasks are listed below
 Commands from Call Control to Layer 3
CC SETUP REQ
Setup Request
CC SETUP RESP
Setup Response
CC SETUP REJ REQ Setup Reject
CC INFO REQ
Information
CC DISCONNECT REQ Disconnect
CC RELEASE REQ Release
 Commands from Call Control Task to Tracer
TR IDLE
Idle ON HOOK
TR DIALTONE
Dial Tone
TR DIALING
Dialing
TR RINGING
Ringing
TR BUSY
Busy
TR CONVERSATION Conversation
TR RINGBACK
Ringback
TR ERROR
Error
CC ALERTING REQ Alerting
CC BROADCAST RESP Broadcast Response
CC CALLPROC REQ Call Proceeding
CC PROGRESS REQ Progress
CC NOTIFY REQ
Notify
CC RESUME RQ
Resume
CC RESUME REJ
Resume Reject
te ^{CC SUSPEND REQ Suspend Request}
CC SUSPEND REJ Suspend Reject
 Command from Layer 3 to Call Control
CC SETUP IND
Setup
CC SETUP CONF
Setup Confirm
CC SETUP COMP IND Setup Complete
CCI NFO IND
Information Indication
le ^{CC ALERTING IND Alerting}
CC PROGRESS IND Progress
CC DISCONNECT IND Disconnect
CC RELEASE IND
Release
CC CALLPROC IND Call Proceeding
o ^{CC RELEASE CONF Release Confirm}
CC STATUS IND
Status Indication
CC ERORR IND
Error Indication
CC RESUME CONF Resume Confirm
s The Call Control Task also communicates with the Tracer
Task using single byte keystroke like commands These
commands are packaged mail messages containing two
bytes the first byte is the Sender Task’s ID the second byte
is the keystroke command The following messages are
b ^{sent between Call Control and Tracer}
 Keystroke Commands from Tracer to Call Control Task
TR ON HOOK
ON Hook
TR OFF HOOK
OFF Hook
TR DIGIT 1
Digit 1
O ^{TR DIGIT 2}
Digit 2
2 5 2 Management Entity Task
The Management Entity Task is closely coupled to the ac-
companying Network Management Entity design and to the
terminal hardware configuration Implementation design de-
cisions have been made that make the Management Entity
Task unique to a particular application while still following
the general requirements of the CCITT Specifications Modi-
fications will be required in the Management Entity Task
prior to its successful operation in a particular application
environment The Management Entity Task that is included
in the HPC ISDN Software Package presumes a particular
hardware configuration and Central Office Software imple-
mentation
The Management Entity Task communicates with the Layer
3 Controller Task the Layer 2 Controller Task and the Lay-
er 1 Device Driver Task via the System Mail Utilities
The Management Entity Task has the following responsibili-
ties
 Initialization of the Terminal Equipment
 Configuration of the Terminal Equipment
 TEI Assignment and Verification
 Multiple Error Notification
 Unrecoverable Error Notification
 Activation Deactivation of the Terminal Equipment
2 6 SYSTEM UTILITIES
The system utilities initializes the HPC system upon power-
up and provide support for various machine specific fea-
tures of the HPC
2 6 1 Power-Up Reset Main Task
This task is the entry point upon system power-up The Main
Task is responsible for
Initializing the general HPC Hardware
Initializing the HPC Executive Data Structures
Queuing up the Tasks on the Ready Queue
The Main Task starts with the highest priority 255 After
running the Main Task has served its purpose and is re-
TR DIGIT 3
Digit 3
moved from the system by waiting on a semaphore which is
typically never signaled
TR DIGIT 4
Digit 4
TR DIGIT 5
Digit 5
2 6 2 Nonmaskable Interrupt (NMI) Handler
TR DIGIT 6
TR DIGIT 7
Digit 6
Digit 7
Since terminal power is generally a concern the HPC can
go into an idle low-power mode when the Terminal Equip-
ment is idle In this mode the HPC is awakened via an NMI
TR DIGIT 8
Digit 8
prompted by a local off hook indication or by a far-end line
TR DIGIT 9
Digit 9
10