PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 173

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

Wait for SF AL
This state is entered in the case of an analog loop-back and allows the Receiver to
update the AGC, to recover the timing phase, and to update the EQ-coefficients. Signal
SN3 is sent instead of signal SN2 in the "Wait-for-SF" state.
4.4.4
State Diagram
The LT-RP- and NT-RP-state diagrams are subsets of the related diagrams of LT and
NT modes so the meaning of events and states are mostly identical. All differences
caused by special requirements of the implementation of the repeater modes are listed
below.
– ACT-, UOA-, SAI- and DEA-bits are completely controlled via the MON-2-messages,
– To enable the deactivation of the first section in case of an erroneous situation in the
– The MON-2-message is accepted and stored at any time except during reset (pin or
Note 47:
Semiconductor Group
so they are not referenced as outputs in the state diagrams.
second section of the U-interface, a new C/I-channel code is introduced. DU (0011)
leads to the deactivation of the NT-RP passing to "Receive Reset".
C/I-channel command).
mode. This implies that the C/I indications ARL and AIL are not issued upon
reception of the EOC command LBBD from upstream in the states
’Synchronized’, Transparent and ’ERROR S/T’ of the NT-RP state diagram
(see "State Transition Diagram NT-Repeater Mode", page 175). For handling
EOC commands in repeater mode, see "EOC Addressing Management",
page 257.
In non standard applications of the NT repeater mode the C/I indications ARL
and AIL will be issued if the EOC Auto mode is being used and if the EOC
command LBBD has been received from upstream.
State Machine in Repeater Modes
In repeater applications it is recommended to use the EOC Transparent
173
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091