PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 240
PEF2091
Manufacturer Part Number
PEF2091
Description
ICs for Communications(ISDN Echocancellation Circuit)
Manufacturer
Siemens Semiconductor Group
Datasheet
1.PEF2091.pdf
(298 pages)
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Semiconductor Group
Single-Channel Loop-Back in EOC Transparent Mode
–––––> C/I AI
<––––– C/I AI
<––––– MON-0 LB1
–––––> MON-0 LB1
–––––> MON-8 LB1
<––––– MON-0 LB2
–––––> MON-0 LB2
–––––> MON-8 LB2
–––––> MON-0 RTN (FF
–––––> MON-8
In the above example the LT is operated in EOC Auto mode.
NT
NORM
(1100
(1100
(51
(51
(F4
(52
(52
(F2
(FF
H
H
H
H
H
H
H
H
)
)
)
)
)
)
)
)
B
B
) C/I AR
) C/I AI
LT
MON-0
LBBD
MON-0 LBBD (51
MON-0
LBBD
MON-0 LB2
MON-0 RTN
MON-0 RTN
240
(51
(52
(52
(FF
(FF
(1000
(1100
H
H
H
H
H
H
)
)
)
)
)
)
B
B
) <––––– ; U-interface is activated
) –––––>
<––––– ; Close B1 loop (EOC)
–––––> ; Transmit acknowledgment
<––––– ; Close B2 loop (EOC)
–––––> ; Transmit acknowledgment
<––––– ; Request to open all loops
–––––> ; Receive acknowledgment
;
;
; Close B1 loop in IEC
;
;
;
;
; Open all loop-backs
Request passes IEC
transparent
Request passes IEC
transparent
Close B2 loop in IEC
B1 and B2 closed
Data Sheet 01.99
Programming
PEB 2091
PEF 2091
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