PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 81

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.3
This chapter illustrates the interactions during activation and deactivation between the
LT and NT station. An activation can be initiated by either of the two stations involved. A
deactivation procedure can be initiated only by the exchange.
This chapter shows the user how to activate and deactivate the device under various
circumstances. Two types of start-up procedures are supported by the U-transceiver:
• cold starts and
• warm starts.
Cold starts are performed after a reset and require all echo and equalizer coefficients to
be recalculated. This procedure typically is completed after 1-7 seconds depending on
the line characteristic and the connected NT. Cold starts are recommended for
activations where the line characteristic has changed considerably since the last
deactivation.
A warm start procedure uses the coefficient set saved during the last deactivation. It is
therefore completed much faster (maximum 300 ms). Warm starts are however
restricted to activations where the line characteristic has not changed significantly since
the last deactivation.
Both start-up procedures differ only in the fact that the device has been transferred into
the RESET state (= cold start) prior to activation. Activation initialization and procedure
is in both cases identical. The following sections thus apply to both warm and cold start-
ups.
The table below summarizes the existing U-interface signals as specified by ETSI/ ANSI.
Table 12
Data Sheet
Signal
SN3T
TN
TL
SN0
SN1
SN2
SN3
SL0
SL1
1)
1)
Layer 1 Activation/ Deactivation Procedures
U-Interface Signals
Synch. Word
no signal
no signal
present
present
present
present
present
(SW)
⊄3
3
NT-Modes (NT –> LT)
LT-Modes (LT –> NT)
Superframe
no signal
no signal
present
present
absent
absent
absent
(ISW)
71
3
3
no signal
no signal
2B + D
normal
1
1
1
1
3
3
Operational Description
no signal
no signal
PEF 24911
normal
M-Bits
normal
2001-07-16
1
1
1
3
3