DATAPAC NETWORK MESSAGES
Service     - DATAPAC 3101  (ITI)                .

Explanation of Datapac 3101 "Call Connected: Message"
-----------------------------------------------------

When a Datapac 3101 call is established through the network, a call connected
message is received at the originating DTE.   All or some of the following
messages may be identified depending on the type of call,  options used for
the call, and the type of destination.

Example:

DATAPAC: call connected to XXXXXXXX (DNA)
[HUNTED] [BACKED UP] [BACKED UP & HUNTED]
[i LCN] [P/N PACKETSIZE: (128 OR 256)] [NUI (6 to 8 CHAR)CHARGING]
[CUG:(CUG#)] [REVERSE CHARGE]

MESSAGE                         EXPLANATION
-------                         -----------

Call connected to: XXXXXXXX     A virtual circuit has been established
                                between an originating DTE and a remote
                                (receiving) DTE.

Hunted                          The remote logical channel is part of
                                a hunt group.

Backed Up                       The call attempt to the remote DTE has failed.
                                The network has re-directed the call to
                                another predetermined DTE that has been
                                optioned as backup.

i                               The call has been placed to an international
                                address.

P                               Priority service.  Packet size: 128.

N                               Normal service.  Packet size: 128 or 256.

DNA                             Data Network Address of the originating DTE.

LCN                             Logical Channel Number of the recipient DTE.

NUI                             The call will be billed to the 6 to 8
                                character Network User Identifier.

CUG                             The recipient DTE is part of a closed user
                                group.

Reverse Charge                  The recipient DTE has accepted the charge
                                associated wih the established call.

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DATAPAC NETWORK MESSAGES
  1  NATIONAL SERVICE
  2  INTERNATIONAL SERVICE
  3  DATAPAC 3101  (ITI)                .                                      
                                                                               
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DATAPAC NETWORK MESSAGES
Service     - NATIONAL SERVICE

EXPLANATION OF NETWORK MESSAGES
===============================

Datapac Domestic Service
------------------------

There are thrity-three messages which may appear when you are
accessing the Datapac network.  All of these network-generated
messages which are sent to a terminal, are written as "Datapac:
text".  The "text" will be one of the following messages:

     TEXT               EXPLANATION

(a)  ADDRESS            This is a Datapac herald message for an SVC
                        terminal.  The "address" displayed is your
                        Datapac network address.  This message
                        indicates that you are connected to the
                        Datapac network.  Proceed with the call
                        request command.

(b)  {P,R} TERMINAL     This is a Datapac herald message for a PVC
                        terminal.  It indicates that you are
     (DESTINATION       connected to the network (address and
     ADDRESS LOGICAL    destination address)
     CHANNEL)

(c)  CLOSED USER GROUP  These messages indicate an error in the call
     ERROR INVALID      request command--correct and re-enter the
     ADDRESS, MORE      command.
     THAN 12 DATA
     CHARACTERS, or
     COMMA REQUIRED
     BEFORE DATA
     CHARACTERS

                 [P][R]
(d)  CALLED BY   or     This message indicates that a host or
                 [N][I] terminal has called you.  Proceed with
     ADDRESS (XXX)      sign-on.  (Note: P or N denotes grade of
                        service. R specifies the charging option,
                        if applicable.  I specifies that it is an
                        international call.  (XXX) specifies the
                        logical channel number if it is a national
                        call, and specifies the gateway id if it
                        is an international call.

(e)  CALL CONNECTED     This message indicates that the SVC
                        connection between your terminal and the
                        destination has been established
                        successfully.

(f)  RE-ENTER           This message indicates that a transmission
                        error has occurred in the current input line.
                        Re-enter the line.  If the problem persists,
                        report the trouble to Telecom Canada.

(g)  INPUT DATA LOST    This message indicates that a transmission
                        error has occurred.  Since part of your input
                        line has already been transmitted to the
                        destination, enter a "line delete" character
                        for your application and a carriage return
                        (CR).  When the destination replies, re-enter
                        the line.

(h)  PARITY ERROR       This message indicates that a parity error
                        has occurred in the current input line from
                        a terminal which is operating in echo mode.
                        The character which is in error is not
                        echoed.  Re-enter the character and continue
                        normal input.  If the problem persists,
                        report the trouble to Telecom Canada.

(i)  INPUT ERROR        This message indicates that there is a
                        network problem, due to overruns.  If the
                        problem occurs often, contact Telecom
                        Canada.

(j)  PVC -              This message indicates that a network problem
     DISCONTINUED       is preventing the requested call from
     TEMPORARY          continuing.  Wait for the Datapac herald
     NETWORK PROBLEM    message, then continue.  If the condition
                        persists, contact Telecom Canada.

(k)  PVC                This message indicates that either the access
     DISCONTINUED -     line to the destination, or the destination
     DESTINATION        itself is down.  Try again later.  If the
     NOT RESPONDING     condition persists, contact the destination.

(l)  PVC                This message indicates that the desti-
     DISCONTINUED -     nation has asked that the connection be
     REMOTE REQUEST     discontinued.

(m)  INVALID COMMAND    This message indicates that there is a
                        syntax error in the command.  Correct it
                        and re-enter the command.

(n)  COMMAND            This message indicates that the command
     NOT ALLOWED        which was entered, although syntactically
                        correct, cannot be implemented either due
                        to the NIM state, or because it violates
                        and/or conflicts with the service options
                        selected --e.g., a call request command,
                        when an SVC is already established.

(o)  CALL CLEARED--     This message indicates that the destination
     DESTINATION BUSY   computer cannot accept another call.  Try
                        again later.

(p)  CALL CLEARED--     This message indicates that the call request
     INCOMPATIBLE       command includes facilities which are not
     CALL OPTIONS       available at the destination or are
                        incompatible with it.  Verify and try the
                        call again.  If the problem persists, contact
                        the destination.

(q)  CALL CLEARED--     This message indicates that a network
     TEMPORARY          problem has occurred--try again later.
     NETWORK PROBLEM    If the problem persists, report it to
                        Telecom Canada.

(r)  CALL CLEARED--     This message indicates that the desti-
     DESTINATION NOT    nation is either not acknowledging your
     RESPONDING         request to connect or it is inoperable.
                        Try again later.  If the problem persists,
                        contact the destination.

(s)  CALL CLEARED--     This message indicates that the network has
     ACCESS BARRED      blocked your call because of a Closer User
                        Group violation.  Verify the call establishment
                        procedures with the destination.

(t)  CALL CLEARED --    This message indicates that the network
     ADDRESS NOT IN     address in the call request command
     SERVICE            identifies a non-existent destination--
                        i.e., the address is not yet (or is no
                        longer) assigned.  Verify the address
                        and re-enter the call request command.
                        If the condition persists, contact the
                        destination.

(u)  CALL CLEARED --    This message indicates that the desti-
     COLLECT CALL       nation is not willing to accept the charges
     REFUSED            for the connection (e.g., it does not
                        accept calls from Datapac 3101 public
                        dial ports).  Verify the call establish-
                        ment procedures and try the call again.
                        If the condition persists, contact the
                        destination.

(v)  CALL CLEARED --    This message indicates that a network
     LOCAL PROCEDURE    protocol error has occurred.  Try the
     ERROR              call again.  If the condition persists,
                        report the trouble to Telecom Canada.

(w)  CALL CLEARED --    This message indicates that a destination
     REMOTE PROCEDURE   protocol error has occurred.  Try the call
     ERROR              again.  If the condition persists, contact
                        the destination.

(x)  CALL CLEARED --    This message indicates that a virtual circuit
     LOCAL DIRECTIVE    has been cleared in response to a clear
                        command from a terminal user.

(y)  CALL CLEARED --    This message indicates that a virtual circuit
     REMOTE DIRECTIVE   has been cleared in response to a clear
                        request packet from the destination.

(z)  CALL CLEARED --    This message indicates that a virtual circuit
     REMOTE REQUEST     has been cleared in response to an invitation
                        from the destination to clear the call.
(aa) RESET-TEMPORARY    This message indicates that a network problem
     NETWORK PROBLEM    has occurred on the PVC connection.  Wait for
                        the Datapac herald message, then continue.
                        If the condition persists, report the trouble
                        to Telecom Canada.

(bb) RESET-DESTINATION  This message indicates that the destination
     NOT RESPONDING     end of the PVC connection is not responding--
                        i.e., either the access line to the
                        destination, or the destination  itself, is down.
                        Try again later.  If the condition persists, contact
                        the destination.

(cc) RESET--LOCAL       This message indicates that the PVC has been
     PROCEDURE ERROR    reset because of a network protocol error.
                        Wait for the Datapac herald message, then
                        continue.  If the condition persists, report
                        the trouble to Telecom Canada.

(dd) RESET--REMOTE      This message indicates that the PVC has been
     PROCEDURE ERROR    reset because of the destination protocol
                        error.  Wait for the Datapac herald message,
                        then continue.  If the condition persists,
                        contact the destination.

                        If the host computer is connected via the
                        ITHI option, this message indicates that data
                        has been disregarded due to the host not
                        reacting to flow control conditions sent by
                        the PAD.

(ee) RESET--LOCAL       This message is the network's response to a
     DESTINATION        reset command from the terminal user.
                        Continue.

(ff) RESET--BY          This message indicates that the destination
     DESTINATION        has reset the virtual circuit.  Data may have
                        been lost.  Continue.  If the condition
                        persists; report it to the destination.

(gg) RESET-TEMPORARY    These messages indicate that the network
     NETWORK PROBLEM    has reset the switched virtual circuit.  Data
           or           may have been lost. Continue.  If the problem
     RESET--LOCAL       persists, report it to Telecom Canada.
     PROCEDURE ERROR





DATAPAC NETWORK MESSAGES
Service     - INTERNATIONAL SERVICE

DATAPAC INTERNATIONAL
=====================

There are several messages which may appear when you are accessing
foreign packet switching networks through the Datapac X.75 gateways.
All of these network-generated messages which are sent to a terminal,
are written as "DATAPAC:TEXT".  The TEXT will be one of the following
messages.  These messages may originate from within DATAPAC or from
within any foreign network that is involved in the call or call
attempt.

(a)  CALL CLEARED --     A network problem within a Datapac
     TEMPORARY NETWORK   or foreign network prevents either
     PROBLEM (XXY)       the requested call from being established
                         or the established call from being
                         continued.  Try again later.

(b)  CALL CLEARED --     Either the foreign network requested is not
     ADDRESS NOT IN      accessible from Datapac, or the foreign
     SERVICE (XXY)       network address specified identifies a non-
                         existent destination, i.e., the address is
                         not yet assigned or no longer assigned.
                         Verify with destination that the foreign
                         network is accessable from Datapac and that
                         the foreign network address is assigned.

(c)  CALL CLEARED --     The calling terminal is not permitted to
     ACCESS BARRED       establish an international call to the
     (XXY)               called destination address because of a
                         closed user group violation.  Verify
                         network address with destination.

(d)  CALL CLEARED --     Either the foreign network or the desti-
     COLLECT CALL        nation address is not willing to accept
     REFUSED (XXY)       the collect calls.  Verify the call
                         establishment procedures with destination.

(e)  CALL CLEARED --     The Call Request is considered invalid
     INCOMPATIBLE        by the foreign network mainly because of
     CALL OPTIONS        the incorrect number of digits in the
     (XXY)               foreign network address.  Verify foreign
                         network address with destination.

(f)  CALL CLEARED --     The destination is out of order, possibly
     DESTINATION NOT     because the destination's network access
     RESPONDING (XXY)    link is inoperative.  Try again later
                         and verify with destination.

(g)  CALL CLEARED --     The destination address called is fully
     DESTINATION BUSY    engaged (no logical channels available)
     (XXY)               and cannot accept another call at this
                         time.  Try again later.

(h)  CALL CLEARED --     This message indicates a protocol error at
     REMOTE PROCEDURE    the remote DTE interface.  Check with remote
     ERROR (XXY)         DTE  (destination).


Gateway Identification
----------------------

The network generated messages sent to Datapac ITI terminals include
a 3-digit field to identify the gateway involved.  This field is
shown as (XXY) for the network messages listed in above.

If the call has not been established, the XXY = 000.  If the call has
been established, then

XX = 2-digit Datapac Service Exchange (DSE) of the gateway node used
     for the call

Y = Gateway ID of the gateway used for the call.

