PEB 24911 H V1.3 Lantiq, PEB 24911 H V1.3 Datasheet - Page 71

• Manufacturer Part Number: PEB 24911 H V1.3
• Manufacturer: Lantiq

Specifications of PEB 24911 H V1.3

• Lead Free Status / Rohs Status: Supplier Unconfirmed

LSUE
SEC
SFD
TN
BBD0/1
Timers
The start of timers is indicated by TxS, the expiry by TxE. The following
which timers are used in LT-modes:
Table 11
Timer
T1
T2
Data Sheet
the LT waits for a response (no signal level) from the NT-side, i.e. after a deactivation
procedure has been started or after loss of framing in the LT occurred.
Loss of Signal Level on the U-interface (error condition)
After a loss of signal level has been noticed, a 492 ms timer is started. After this timer
has elapsed, the LSUE-criterion is fulfilled. This long response time (see also LSU) is
valid in all cases where the LT is not prepared to lose signal level. Note that 492 ms
represent a minimum value; the actual loss of signal might have occurred earlier, e.g.
when a long loop is cut at the LT-side, the echo coefficients need to be readjusted to
new parameters. Only after the adjusted coefficient cancel the echo completely, the
loss of signal is detected and the timer can be started (if the long loop is cut at the
remote end, the coefficients are still correct and a loss of signal will be detected
immediately).
Signal Level behind the echo canceler
This signal indicates that a signal level corresponding to SN2 from the NT has been
detected on the U-interface.
Superframe Detected
Tone (wake-up signal) received from the NT.
When in the “Deactivated” state, the U-transceiver is requested to start an activation
procedure and to inform the LT-side making use of the C/I-channel code AR. When
in the “Wait for TN” state, the signal TN sent by the NT acknowledges the receipt of
a wake-up signal TL from the LT.
When an analog loop-back is operated, the wake-up signal TL sent by the
LT-transmitter is detected by the LT-receiver.
The TN-criteria is fulfilled when 12 consecutive periods of the 10 kHz wake-up tone
were detected.
Binary “0” or “1s” detected in the B- and D-channels
This internal signal indicates that for a period of time of 6–12 ms a continuous stream
of binary “0s” or “1s” has been detected. It is used as a criterion that the receiver has
acquired frame synchronization and both its EC- and EQ-coefficients have
converged. BBD1 corresponds to the signals SN2 or SN3 in the case of a normal
activation and BBD0 corresponds to the internally received signal SL2 in the case of
an analog loop-back or possibly a loop-back 2 in the NT.
Timers Used in LT-Modes
Duration (ms) Function
15000
3
Supervisor for start-up
TL-transmission
Receiver reset
61
Functional Description
State
Alerting
Reset for loop
Table 11
PEF 24911
2001-07-16
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