61850 MMS 相关协议

61850 MMS

相关协议

1. TPKT = RFC 1006

It start with x03X00.

TPKT

is

used

to

on top

of TCP.

The two

major

points

missing

in

TCP

(compared

to

COTP)

are

the

TSAP

addressing

and

the

detection

of packet boundaries on the receiving host.

Include Packet Header and TPDU, The format of the TPDU is defined in [ISO8073].

Note

that

only

TPDUs

formatted

for

transport

class

0

[TP0]

are

exchanged

(different

transport classes may use slightly different formats).

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

| vrsn | reserved | packet length |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Header:version = always 3, 1 byte

TPDU = max. 65531. Based on the size of the data transfer (DT) TPDU, this permits

a maximum TSDU size of 65524 octets.

2. COTP = ISO 8073 / RFC983

Connection-oriented transport protocol

To support expedited data, a non-standard TPDU, for expedited data is permitted.

The format used for the ED TPDU is nearly identical to the format for the normal

data, DT, TPDU. The only difference is that the value used for the TPDU's code

is ED, not DT:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

| header length | code |credit |TPDU-NR and EOT| user data |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| ... | ... | ... | ... |

| ... | ... | ... | ... |

| ... | ... | ... | ... |

+-+-+- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+

TPDU Code

-------------------

CR = 0xE0, Connection Request

CC = 0xD0, Connection Confirm

DR = 0x80, Disconnection Request

DT = 0xF0, Data Transfer

ED = 0x70, Expected Data transfer

After

the

credit

field

(which

is

always

ZERO

on

output

and

ignored

on

input),

there

is one additional field prior to the user data.

TPDU-NR and EOT = 8 bits

Bit 7 (the high-order bit, bit mask 1000 0000) indicates the end of a TSDU. All

other bits should be ZERO on output and ignored on input.

The format of a CR or CC TPDU is:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

| header length | code | credit| destination reference |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| source reference | class |options| variable data |

+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| ... | ... | ... | ... |

| ... | ... | ... | ... |

| ... | user data | ... | ... |

| ... | ... | ... | ... |

+-+-+- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+

The format of a DR TPDU is:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| header length | code | credit| destination reference |

+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+

| source reference | reason | variable data |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| ... | ... | ... | ... |

| ... | ... | ... | ... |

| ... | user data | ... | ... |

| ... | ... | ... | ... |

+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

The format of a DT or ED TPDU is:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-++-+-+-+

| header length | code | credit| TPDU-NR and EOT |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| user data | ... | ... | ... |

| ... | ... | ... | ... |

| ... | ... | ... | ... |

+-+-+- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+

3. ISO 8327-1

ISO Session Protocol

Format

--------------------------- --------------------

SPDU Type -- 1 byte

Length -- 1 byte

Connect Accept Item -- 8 bytes

Session Requirement -- 4 bytes

Calling Session Selector -- 4 bytes

Called Session Selector -- 4 bytes

Session User Data -- ...

ISO Session Protocol (ISO-SP) Messages:

Functional unit

SPDU code

SPDU name

Kernel

CN

OA

CDO

AC

RF

FN

DN

AB

AA

DT

PR

CONNECT

OVERFLOW ACCEPT

CONNECT DATA OVERFLOW

ACCEPT

REFUSE

FINISH

DISCONNECT

ABORT

ABORT ACCEPT

DATA TRANSFER

PREPARE

Negotiated release

NF

GT

PT

NOT FINISHED

GIVE TOKENS

PLEASE TOKENS

Half- duplex

GT

PT

GIVE TOKENS

PLEASE TOKENS

Duplex

No additional associated SPDUs

Expedited data

EX

EXPEDITED DATA

Typed data

TD

TYPED DATA

Capability data exchange

CD

CDA

CAPABILITY DATA

CAPABILITY DATA ACK