PEF24901HV22XT Lantiq, PEF24901HV22XT Datasheet - Page 62

• Manufacturer Part Number: PEF24901HV22XT
• Manufacturer: Lantiq

Specifications of PEF24901HV22XT

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

DFE-T
PEF 24901
Functional Description
Deactivating
The U-transceiver deactivates the U-interface sending U0 and waits in turn for signal U0
to enter the ’Deactivated’ state. Timer T05 ensures that the C/I code DEAC is recognized
by the exchange.
Deactivated
On the receipt of ’DC’ in the C/I channel the U-transceiver may enter the power-down
state. In power-down mode all power consuming parts of the device which are not
required for the wake-up detection are switched off.
The U-transceiver waits either for an activation request (AR, AR1, AR2, AR4) from the
exchange or for a wake-up signal U1W from the NT.
Link to TE Synchron
The whole transmission system from the LT to the TE is now synchronized in both
directions of transmission. Signal U4H is sent until the expiry of timer T1. U4H requires
the NT to establish a transparent link to the TE.
If synchronization has been lost the U-transceiver issues RSY on the C/I-channel until it
has resynchronized again.
Reset
The Reset state is entered by the unconditional command RES or pin-RES. All stored
coefficients are erased. The U-transceiver leaves the Reset state if pin-RES is set
inactive (’1’) and the C/I code DR or AR1 is applied. The U-transceiver does not react on
the receipt of a wake-up signal.
Synchronizing
After the awake procedure, the U-transceiver trains its receiver coefficients until it is able
to detect the signals U1 or U3.
Sending Awake-Acknowledge
On the receipt of the awake signal U1W the U-transceiver responds with the
transmission of U2W.
Start Awaking Uk0
On the receipt of AR, AR1, AR2 or AR4 in the C/I-channel the U-transceiver is sending
the awake signal U2W.
Data Sheet
63
2002-09-30