Xerox WorkCentre Pro 423 - Page 110

WorkCentre Pro 423/428 2-78 CHAPTER 2 TROUBLESHOOTING
03/02 Level 2 Troubleshooting
2.3.2.2 ISDN Basic Sequences
D-channel sequence
Operator Presen-
tation
Appli-
cation
Session Trans-
por
t
Net-
work
Data-
Link
Physi-
cal
ISDN ne
t
Physi-
cal
Data-
Link
Net-
work
Trans-
por
t
Session
Presen-
tation
Appli-
cation
Operator
ALEART
CONN
Connection
confirmation
C
Call request
Req est
Connection
indication
INFO 4
UA
CALLPROC
INFO 2
INFO 3
INFO 4
SETUP
Termination
notice
UI
CONN
CONNACK
Response
R
TEI allocation
TEI request
UI
SABME
UI
TEI request
TEI allocation
UI
Call
ALEART
CONNACK
CALLPROC
SETUP
INFO 2
INFO 1
INFO 3
*1
*2
*1 This section is not generated if the receiving side is
already active.
*2 This section is generated only for an analogue
terminal (G3 Fax or telephone).
SABME
UA