Data indication

Direction

MTP 2 -> MTP 3

Description

Notifies the layer 3 application of an MSU (message signal unit) received on the specified data link.

The following table lists the message parameters:

Type

Field

Description

U8

Message Type

0x16

S16

Service User ID

Application reference number for the link from Bind request.

Variable

Data

Contents of the received MSU. The first byte of data is typically the SIO (service information octet), followed by the routing label, and protocol dependent data. Layer 2 strips the flags, 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. The application derives the length of the data from the message start and end offsets in the message.