PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 238

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

Semiconductor Group
Complete Loop-Back in EOC Transparent Mode
–––––> C/I AI
<––––– C/I AI
<––––– MON-0
–––––> MON-0
–––––> MON-8
–––––> MON-0 RTN (FF
–––––> MON-8
In the above example the LT is operated in EOC Auto mode.
NT
LBBD
LBBD
LBBD
NORM
(1100
(1100
(50
(50
(F1
(FF
H
H
H
H
H
)
)
)
)
)
B
B
) C/I AR
) C/I AI
LT
MON-0
LBBD
MON-0 LBBD (50
MON-0 RTN
MON-0 RTN
238
(1000
(1100
(50
(FF
(FF
H
H
H
H
)
)
)
)
B
B
) <––––– ; U-interface is activated
) –––––>
<––––– ; Close complete loop (EOC)
–––––> ; Transmit acknowledgment
<––––– ; Request to open all loops
–––––> ; Receive acknowledgment
;
;
; Close complete loop in IEC
; Open all loop-backs
Request passes IEC-Q
transparent
Data Sheet 01.99
Programming
PEB 2091
PEF 2091