LINKTYPE_SITA
Packet structure
+---------------------------+ | Flags | | (1 Octet) | +---------------------------+ | Signals | | (1 Octet) | +---------------------------+ | Errors 1 | | (1 Octet) | +---------------------------+ | Errors 2 | | (1 Octet) | +---------------------------+ | Protocol | | (1 Octet) | +---------------------------+ | Payload | . . . . . .
Description
The bits in the Flags field are:
0x01
- set if the frame was transmitted from the remote to the IOP, clear if the frame was received by the remote from the IOP;0x80
- set if there was a buffer failure.
The Signals field shows the state of various RS-232 signals:
0x01
- Data Set Ready;0x02
- Data Terminal Ready;0x04
- Clear To Send;0x08
- Request To Send;0x10
- Data Carrier Detect.
The bits in the Errors 1 field are, for frames received by the remote from the IOP:
0x01
- framing error;0x02
- parity error;0x04
- collision;0x08
- long frame received;0x10
- short frame.
The Errors 1 field is unused for frames transmitted from the remote to the IOP.
The bits in the Errors 2 field are, for frames received by the remote from the IOP:
0x01
- non-octet-aligned frame;0x02
- abort received;0x04
- carrier lost;0x08
- DPLL error;0x10
- overrun error;0x20
- frame length violation;0x40
- CRC error;0x80
- break received.
and, for frames transmitted from the remote to the IOP:
0x01
- transmitter underrun;0x02
- Clear To Send lost;0x04
- UART error;0x08
- retransmit limit reached.
The Protocol field indicates the protocol; the values of that field are:
- 1 - LAPB;
- 2 - Ethernet;
- 3 - asynchronous (interrupt I/O);
- 4 - asynchronous (block I/O);
- 4 - asynchronous (block I/O);
- 5 - IPARS/ALC (International Passenger Airline Reservation System/Airline Link Control);
- 6 - UTS;
- 7 - PPP/HDLC;
- 8 - SDLC;
- 9 - Token Ring;
- 16 - I2C;
- 17 - DPM link;
- 18 - Frame Relay.