PEF82912FV14XP Lantiq, PEF82912FV14XP Datasheet - Page 105

• Manufacturer Part Number: PEF82912FV14XP
• Manufacturer: Lantiq

Specifications of PEF82912FV14XP

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Note:
Note:
Input Signals of the State Machine and related U-Signals
The table below summarizes the input signals that control the NT state machine and that
are extracted from the U-interface signal sequences.
•
LOF
LSEC
LSU
LSUE
FD
SFD
BBD0 /
BBD1
TL
Data Sheet
1)
2)
A 40 kHz signal composed by alternating +/-3 or +/-1 transmit pulses.
A series of single pulses spaced at intervals of 1.5 ms; Either alternating +/-1 or
+/-3 pulses can be selected.
Alternating ± 3 symbols at 10 kHz.
4 Options for the test signal can be selected by register TEST:
Loss of framing
This condition is fulfilled if framing is lost for 573 ms.
Loss of signal behind echo canceller
Internal Signal which indicates that the echo canceller has converged
Loss of Signal on U-Interface
This signal indicates that a loss of signal level for a duration of 3 ms has
been detected on the U-interface. This short response time is relevant in
all cases where the NT waits for a response (no signal level) from the LT-
side.
Loss of Signal on U-Interface - Error condition
After a loss of signal has been noticed, a 588 ms timer is started. When
it has elapsed , the LSUE-criterion is fulfilled. This long response time
(see also LSU) is valid in all cases where the NT is not prepared to lose
signal level i.e. the LT has stopped transmission because of loss of
framing, an unsuccessful activation, or the transmission line is
interrupted.
Frame Detected
Super Frame Detected
BBD0/1 Detected
These signals are set if either ’1' (BBD1) or ’0' (BBD0) were detected in
4 subsequent basic frames. It is used as a criterion that the receiver has
acquired frame synchronization and both its EC- and EQ-coefficients
have converged. BBD0 corresponds to the received signal SL2 in case
of a normal activation, BBD1 corresponds to the internally received
signal SN3 in case of analog loop back.
Awake tone detected
The U-transceiver is requested to start an activation procedure.
91
Functional Description
PEF 82912/82913
2001-03-30