CR
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... with a Connection Confirm (CC) TPDU. Before sending the CR TPDU, the
initiator assigns the transport connection being ...
... class 0 is the preference.) The initiator should assume
when it sends the CR TPDU that its preferred class will be agreed to,
and commence the functions associated with that class ...
... During the establishment phase of the transport connection,
the use of the expedited data option field of CR/CC allows both
Transport Service user to negotiate the use or non use of the
...
... cannot be accepted, the called
transport entity shall respond to the CR TPDU with a DR TPDU. The
clearing reason shall indicate why the connection ...
... an unassigned reference.
If the CR is regarded as an invalid TPDU, the called transport
entity will respond by sending an ...
... TPDUs and Fields Used:
CR
- source reference
...
... transport entity commencing resynchronization,
and will thus be a RJ, or a retransmitted CR or DR.
...
... transport entities.1
1. The CR TPDU does not have a destination reference;
nevertheless it can be distinguished from a new
...
... DC TPDU.
o if the first received TPDU is a CR and the transport
connection is not idle, this means that a CC TPDU is
...
... negotiation rules, only the network connection
over which the CR TPDU was sent may be used for this transport
connection.
...
... which has
requested the establishment of the network connection may send the
CR TPDU. If the calling transport entity receives a CR ...
... CR TPDU. If the calling transport entity receives a CR TPDU, it
shall transfer a TPDU Error (ERR) TPDU to notify the called
...
... transport
connection other than a Disconnect Request (DR) or Connection
Request (CR) will be ignored.
Receipt of a Disconnect Request (DR ...
... Connection Eastablishment
This phase is achieved by exchange of CR/CC TPDU using
the 'connection establishment ...
... authorization is provided through the use of
the TPDUs Credit field. Credit field values are only present in
the following TPDUs: CR, CC, AK..
...
... Upper window edge = N (Credit received either in
CR or in CC and N < 2**p < 2** (n-1), where P is the number of
bits ...
... transport entity which, prior to this event, has
sent a CR and has not yer received a CC, causes
the transport ...
... TPDU by immediately sending a DT, ED or AK TPDU.
o As a result of duplication, a CR TPDU may be
received specifying a source reference which
is already in use with the sending transport ...
... . If this timer expires before a CC TPDU is received, the
CR TPDU is retransmitted and the timer restarted. After
transmission of the CR ...
... CR TPDU is retransmitted and the timer restarted. After
transmission of the CR TPDU N times, the connection establishment
procedure is abandoned and the failure reported to the transport ...
... 7.4.4.7 Initial Credit Allocation
The CR and CC TPDUs may allocate an initial credit value
to their respective recipients. This value is limited to 15 by the
...
... to use for AL at connection establishment, as the 'Acknowledge
Time' parameter in the CR or CC TPDU (depending on whether the
transport ...
... transport entity is initiating or accepting the transport
connection). If this parameter is present in a received CR or CC
TPDU, the value of AR ...
...
0 1 2 3 4 Sect. Code
CR Connection Request x x x x x 8.3 1110xxxx
...
...
8.3 Connections Request (CR)
8.3.1 Structure
...
... 8.3.3 Fixed Part (Octets 2 to 7)
CR: Connection Request Code: 1110
...
... Class 4
The CR contains the first choice of class in the fixed
part as above. Second and subsequent choices are listed in the
...
... See Section 8.2.3.1
This parameter must always be present in a CR TPDU
requesting Class 4, even if the checksum ...