Delivery Confirmation Bit (1 bit)

Protocol: X.25 X.25 PCI

Field: D bit = delivery confirmation bit

Length: 1 bit

Contents: request for acknowledgment.

The delivery confirmation bit is set to make the receiver send an end-to-end acknowledgment (ACK). If the delivery confirmation bit is set to zero, the acknowledgment can be done by the DCE.

0 = end to end ACK not required

1 = end to end ACK required