PEB 2091
PEF 2091
Programming
6.8.7
Complete Activation Initiated by TE with U Active
When the terminal requests to activate the S-interface (U-interface already active) two
cases can occur:
In the first case the exchange has retained control over the S-interface activation. Then
S-activation can proceed only after the explicit permission by the exchange with AR. This
situation is discussed in this section under "case 1". In the second case the exchange is
not requested to send AR in order to continue activation. This situation is described in
"case 2" of this section.
The terminal recognizes no difference between the two types, the procedure on NT side
consequently is identical in both cases.
Case 1 (controlled by exchange)
NT
LT
<––––– C/I DC
–––––> C/I DI
–––––> C/I AR
(1111B)
(1111B)
(1000B)
C/I UAR
C/I UAI
(0111B) <––––– ; U only is activated
(0111B) –––––>
; Terminal requests
; activation
C/I AR
(1000B) –––––> ; Exchange is notified of
; request
C/I AR
(1000B) <––––– ; Exchange permits
; S-activation
<––––– C/I AR
(1000B)
–––––> C/I AI
(1100B)
; Confirm that terminal is
; active
C/I UAI
(0111B) –––––>
<––––– C/I AI
(1100B)
C/I AI
(1100B) –––––> ; Activation complete
Case 2 (no control by exchange)
NT
LT
<––––– C/I DC
–––––> C/I DI
(1111B)
(0011B)
C/I DC
C/I UAI
<––––– ; U only is activated
(0111B) –––––>
–––––> C/I AR
(1000B)
; Terminal requests
; activation
C/I AR
(1000B) –––––> ; Exchange is notified of
; proceeding S-activation
; Confirm that terminal is
; active
<––––– C/I AR
(1000B)
–––––> C/I AI
(1100B)
C/I UAI
(0111B) –––––>
<––––– C/I AI
(1100B)
C/I AI
(1100B) –––––> ; Activation complete
Semiconductor Group
245
Data Sheet 01.99
INFINEON [ Infineon ]
