PEF81902FV1.1 Lantiq, PEF81902FV1.1 Datasheet - Page 129

• Manufacturer Part Number: PEF81902FV1.1
• Manufacturer: Lantiq

Specifications of PEF81902FV1.1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

3
3.1
3.1.1
For control and monitoring purposes of the activation/deactivation progress the following
signal elements are defined by TS 102 080 and FTZ 1 TR 220.
Table 29
U0
U1W, U2W Awake or awake acknowledge signal used in the awake procedure of the
U2
U2A
U1A
U1
Data Sheet
Operational Description
Layer 1 Activation/Deactivation
Generation of 4B3T Signal Elements
No signal or deactivation signal that is used in both directions.
Downstream, it requests the NT to deactivate. Upstream, the NT
acknowledges by U0 that it is deactivated.
U-interface.
The LT sends U2 to enable the own echo canceller to adapt the
coefficients. By the Barker code the NT at the other end is enabled to
synchronize. The detection of U2 is used by the NT as a criterion for
synchronization.
The M-channel on U may be used to transfer loop commands.
While the NT-RP is synchronizing on the received signal, the LT-RP sends
out U2A to enable its echo canceller to adapt the coefficients, but sending
no Barker code it inhibits the NT to synchronize on the still asynchronous
signal.
Due to proceeding synchronization, the U-frame may jump from time to
time. U2A can not be detected in the NT at the far end.
U1A is similar to U1 but without framing information. While the NT
synchronizes on the received signal, it sends out U1A to enable its echo
canceller to adapt its coefficients, but sends no Barker code to prevent the
LT from synchronizing on the still asynchronous signal. Due to proceeding
synchronization, the U-frame may jump from time to time. U1A can not be
detected by the far-end LT.
When synchronized, the NT sends the Barker code and the LT may
synchronize itself. U1 indicates additionally that a terminal equipment has
not yet activated. Upon receiving U1 the LT indicates the synchronized
state by C/I ’UAI’ to layer-2.
Usually during activation, no U1 signal is detected in the LT because the
TE is activated first and U1 changes to U3 before being detected.
The M-channel on U may be used to transfer code error indications and 1
kbit/s transparent data.
4B3T Signal Elements
115
Operational Description
PEF 81902
2001-11-12