Technical data

Once the requirements for the SRD service are met, the sender can
transmit data to the receiver and fetch the data from the receiver’s buffer.
Fig. 8.11 is the logical continuation of the procedure outlined in Fig. 8.10.
Request to layer 2
(Evaluation of the status word))
The data preceded by an
8-byte header are sent
with the SEND HDB
The receiver is informed
that data have been
received
The sender is informed that
an acknowledgment has
arrived from the receiving CP
Indication
Confirmation
The sender fetches the
confirmation with a RECEIVE
HDB. It consists of an 8-byte
header and the data from the
buffer of the (receiver) CP
(Evaluation of the status word)
SENDER
RECEIVER
1
2
4
5
3
(Evaluation of the status word))
(Evaluation of the status word))
The receiver fetches the
received data with the RECEIVE
HDB from the CP. The first 8 bytes
contain management info (header)
The data previously provided by the
receiver were automatically returned
with the confirmation. The now
empty buffer can be filled with data
again.
B8976060/02 Free Layer 2 Communication
8 - 25 Volume 1