Xerox WorkCentre Pro 423 Service Manual page 110

WorkCentre Pro 423/428
2.3.2.2 ISDN Basic Sequences
D-channel sequence
Operator Appli-
cation
Connection
Call request
indication
Req est
*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).
Connection
confirmation
C
Presen- Session Trans- Net- Data- Physi-
tation port work Link cal
INFO 1
INFO 3
TEI request
UI
SABME
SETUP
TEI allocation
*2
CONNACK
2-78
03/02
ISDN net Physi- Data- Net- Trans-
cal Link work port
INFO 2
INFO 4
TEI allocation
UI
UA
CALLPROC
*1
INFO 2
INFO 3
INFO 4
UI
TEI request
UI
SABME
UA
SETUP
CALLPROC
ALEART
ALEART
CONN
CONNACK
CONN
CHAPTER 2 TROUBLESHOOTING
Level 2 Troubleshooting
Operator
Session Presen- Appli-
tation cation
Termination
notice
Call
Response
R