PEB 24911 H V1.3 Lantiq, PEB 24911 H V1.3 Datasheet - Page 76

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

Specifications of PEB 24911 H V1.3

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PEF 24911
Functional Description
Loss of Signal
The “Loss of Signal” state is entered upon the detection of a failure condition i.e. loss of
receive signal (LSUE). The ACT bit is set to “0” and the C/I-channel indication LSL is
issued. The U-transceiver waits for the C/I-channel command RES1 to enter the
“Receive Reset” state.
Loss of Synchronization
The “Loss of Synchronization” state is entered upon the detection of a failure condition
i.e. loss of framing by the LT-receiver (LOF). The ACT-bit is set to “0” and the C/I-channel
indication RSY is issued. The U-transceiver waits for the C/I-channel command RES1 to
enter the “Tear Down Error” state and subsequently the “Receive Reset” state.
Pending Deactivation
“Pending Deactivation” is a transient state entered after the receipt of a DR-code. The
DEA-bit is set to “0”. Timer T10 assures that the DEA-bit is set to “0” in at least three
consecutive superframes before the transmit level is turned off.
Pending Transparent
“Pending Transparent” is a transient state entered upon the detection of ACT = 1 and left
by T8. The ACT-bit is set to “1”. The purpose of this state is to issue the C/I-channel
indication AI (corresponding to “ready for sending”) 24 ms after the ACT-bit has been set
to “1” by the LT-transceiver. This assures that under normal operating conditions the AI-
indication is issued first on the TE-side and only afterwards on the LT-side. Thus the
layer-2 receiver in the TE is already operational when the first layer-2 message is issued
by the LT-side.
Reset
The “Reset” state is entered with the unconditional command RES, respectively Pin-
RES. It is left when pin RESQ is inactive and the C/I-channel code DR is received. SL0
and DEAC are output in “Reset” state. The U-transceiver does not react to the receipt of
a wake-up signal TN.
Reset for Loop
“Reset for Loop” resets the receiver in order to guarantee a correct adaption of the echo-
and equalizer coefficients.
Receive Reset
The “Receive Reset” state assures that for a period of T7 no signal, especially no wake-
up signal TL, is sent on the U-interface, i.e. no activation procedure is started from the
LT-side. A wake-up signal TN, however, from the NT-side is acknowledged.
Data Sheet
66
2001-07-16