PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 68

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.16.1
The transition criteria are described in the following sections. They are grouped into:
– C/I-commands
– Pin settings
– Events related to the U-interface
– Timers
C/I-Commands
AR
AR0
ARL
ARX
DC
Data Sheet
Activation Request
The U-transceiver is requested to enter the power-up state and to start an activation
procedure by sending the wake-up signal TL. In case the U-transceiver is in state
"Deactivated" it is recommended always to apply DC before AR to resolve the situation if
a TN tone has been detected before.
Activation Request with “ACT” bit = (0)
The U-transceiver is requested to enter the power-up state and to start an activation
procedure by sending the wake-up signal TL. After “EQ Training” the state “Line Active” will
be entered independent of the “ACT” bit. Evaluation of the “ACT” bit is disabled when AR0
is received and enabled when AR is received.
In case the U-transceiver is in state "Deactivated" it is recommended always to apply DC
before AR0 to resolve the situation if a TN tone has been detected before.
Activation Request Local Loop-back
The U-transceiver is requested to operate an analog loop-back (close to the U-interface)
and to start the start-up sequence by sending the wake-up tone TL. This command may be
issued only after the U-transceiver has been set to the “Deactivated” state (C/I-channel
code DI issued on DOUT) and has to be issued continuously as long as loop-back is
requested.
Activation Request Extended
The DFE-Q is requested to enter the power-up state and to start an activation procedure by
sending the wake-up signal TL. The difference to the command AR is that the activation
duration may exceed 15 sec.
In case the U-transceiver is in state "Deactivated" it is recommended always to apply DC
before ARX to resolve the situation if a TN tone has been detected before.
Deactivation Confirmation
If ’DC’ is applied in state “Deactivated” the DFE-Q transitions to state "AWAKE" as soon
as it receives a wake-up tone from the NT. If ’DR’ is applied in state “Deactivated” the wake
up request of the NT is not acknowledged. This way the linecard is able to reject an
activation attempt by the NT e.g. during a service procedure.
By means of the ’DC’ command the LT is also during an U-only activation capable to
control the point of time when the complete transmission line is set transparent in case a
terminal initiated activation request has occurred. In state ’S/T Deactivated’ with applied C/
I code ’UAR’ the DFE-Q issues ’UOA= 0’ and receives ’SAI= 0’ from the deactivated S
interface. If the terminal requests an activation with ’AR’ issued in the NT the SAI bit is set
Inputs to the U-Transceiver in LT-Mode
58
Functional Description
PEF 24911
2001-07-16