PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 243

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

6.8.3
The LT ignores the ACT-bit transmitted upstream from the NT if the LT activation has
been initiated with AR0 instead of AR. Because the activation with AR0 is performed with
the UOA-bit set to "0", initially only a partial activation is started. By setting UOA = 1 via
a MON2 message the S-interface is activated as well.
<–––––
–––––>
<–––––
<–––––
<–––––
–––––>
<–––––
<–––––
<–––––
6.8.4
Deactivating the U-interface can be initiated only by the exchange. A deactivation can
be started when the device is in the states "LINE ACTIVE", "PEND. TRANSPARENT" ,
"TRANSPARENT" or "S/T DEACTIVATED"
.
<–––––
–––––>
<–––––
Semiconductor Group
NT
C/I DC
C/I DI
C/I PU
C/I DC
C/I AR
C/I AI
C/I AR
C/I AI
C/I AR
NT
C/I DR
C/I DI
C/I DC
Activation with ACT-Bit Status Ignored by Exchange Side
Complete Deactivation
(1111
(1111
(0111
(1111
(1000
(1100
(1000
(1100
(1000
(1111
(0000
(1111
B
B
B
B
B
B
B
B
B
)
)
)
)
)
)
)
)
)
B
B
B
)
)
)
LT
C/I DC
C/I DI
C/I AR0
C/I AR
C/I ARM
C/I UAI
MON8 PACE
MON2 UOA
C/I UAI
C/I AR
C/I AI
C/I AR0
C/I UAI
LT
C/I DR
C/I DEAC
C/I DI
(1111
(1111
(1101
(1000
(1001
(0111
(80 BE
(2F FF
(1100
(1000
(1100
(1101
(0111
(0000
(0001
(1111
243
B
B
B
B
B
B
B
B
B
B
B
B
B
B
H
H
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
<––––– ; Start deactivation
<––––– ; Initial state is "Deactivated"
–––––> ;
<––––– ; Start activation
–––––> ;
–––––> ;
–––––> ;
<––––– ; Enable control of UOA-bit
<––––– ; and set UOA = 1
–––––> ; ACT-bit status ignored
<––––– ; Enable ACT-bit evaluation
–––––> ; Activation complete
<––––– : Disable ACT-bit evaluation
–––––> : ACT-bit status ignored
–––––> ; Deactivation proceeds
–––––> ;
:
;
;
; Power down NT
;
;
Confirm that terminal is
active
Deactivation complete on
LT
Deactivation complete on
NT
Data Sheet 01.99
Programming
PEB 2091
PEF 2091