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Data Request
Direction
- Layer 3 -> MTP 2
Description
- The DATA REQUEST message asks MTP 2 to transmit a Message Signal Unit (MSU) on the specified data link.
Format
- Service Provider ID MTP 2's reference number for this link on this TX board. Must be 0-15.
- Data The contents of the MSU to transmit; the first byte of data is typically the Service Information Octet (SIO), followed by the routing label and protocol dependent data. Layer 2 inserts the flag(s), sequence number, length indicator, and frame check sequence. The maximum length of the data field is 274 octets (including the SIO). There is no field to specify the length of the data field. MTP 2 derives the length of the data from the message start and end offsets in the message.
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