TSAT 3000 - PORT_MAX_PKT_SIZE [N]

TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 20 of 124
3.1.13 PORT_MAX_PKT_SIZE [n]
Default 0, Range 0…15000
Define the maximum size of a packet received from a STREAM PORT.
Usage is dependent on
PORT_TYPE [n].
PORT_TYPE [n]
Value Description
NONE
SERVICE
ADAPTER
NETWORK
n/a Not Used
0
Define Max-Packet-Size to be exact equal DATA-SIZE. Forward packet
when this number of bytes has been received.
STREAM
1 … 15000
PORT MAX PKT SIZE less or equal DATA-SIZE:
Forward packet when this number of bytes has been received.
PORT MAX PKT SIZE larger than DATA-SIZE:
Forward data each time DATA-SIZE bytes has been received.
All Satellite-Link packets will be concatenated by the Packetizer at
remote side before complete packet is delivered to Application.
Note 1: When a STREAM PORT is connected to Remote-COM via “TSAT Comport Server”, the
Max-Packet-Size value is sent to, and handled by Remote-COM. Packets received from
Remote-COM will be forwarded when total received bytes exceeds
PORT_MAX_PKT_SIZE.
Note 2: DATA-SIZE is defined to be the maximum number of User-Data bytes available in a
Satellite-Link packet. I.e.
PKT_OUTBOUND_SIZE / PKT_INBOUND_SIZE – “TSAT Header”. The
size of “TSAT Header” can be from 5 to 15 bytes, depending on several MIB parameters:
• PKT_OUTBOUND_SIZE 1 or 2 bytes Data-Size.
•
PKT_INBOUND_SIZE 1 or 2 bytes Data-Size.
•
NET_RT_ADDRESS 1 or 2 bytes Address.
•
PORT_STREAM_RT [n] 2 or 3 extra bytes Second-Address + Port.
•
PORT_MAX_PKT_SIZE [n] 1 extra byte when Packetizer is used.
•
PORT_MAX_APPL_RETRIES [n] 1 to 4 extra bytes when Secure-Link is used.
•
LCC_WINDOW_SIZE 1 to 4 extra bytes when Secure-Link is used.
•
UTL_UTILITY_MASK UTILITY_NO_PIGGYBACK: 1 or 2 lesser bytes.
See also
PORT_PKT_TIMEOUT [n].