Configuration
(4)
Balanced
Configuration
o Both stations in a point-to-point
topology are of combined type
o HDLC does not support balanced multipoint
Station
Types & Configurations
 |
Modes
o A mode in HDLC is the relationship b/w
two devices involved in an exchange
o The mode describes who controls the link
o HDLC supports 3 modes of communication
b/w stations:
-Normal
Response Mode (NRM)
-Asynchronous
Response Mode (ARM)
-Asynchronous
Balanced Mode (ABM)
 |
Normal
Response Mode (NRM)
o Refers to the standard primary-secondary
relationship
o Secondary device must have permission
from primary device before transmitting
o Once permission has been granted, the
secondary may initiate a response transmission
of
one or more frames containing data
|
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