PXB4221EV34NP Lantiq, PXB4221EV34NP Datasheet - Page 53

• Manufacturer Part Number: PXB4221EV34NP
• Manufacturer: Lantiq

Specifications of PXB4221EV34NP

• Data Rate: 2.048Mbps
• Number Of Channels: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

In SDT mode, the cells are segmented when the first (multi) frame synchronization pulse
after segmentation start is received from the framer receive interface of that channel.
The resulting SC value and pointer field of the first cell transmitted will both be 0.
4.3.1.2
The segmentation and reassembly function can be programmed to use, alternatively to
the standard AAL type 1 SAR-PDU, a SAR-PDU that is referred to as AAL type 0 and
consists of 48 octets payload without any overhead. The selection is done by
programming the “AAL0” field in the “AAL Receive Reference Slot”.
AAL Type 0
Figure 13
payload with User Information octets by programming field “part_fill” in the “AAL Receive
Reference Slot” of RAM1 to values smaller than 48.
Figure 13
AAL Type 1 SDT Structure Length
For Structured Circuit Emulation Service as defined by the ATM-Forum in “Circuit
Emulation Services Version 2.0" [10] Structured Data Transfer (SDT) is used. The
structure length used for SDT in ATM cells is:
• N
• N x 16
• N x 24
The selection between frame-based or multiframe-based SDT is done by the bit
“sdt_mfs” in the “AAL Receive Reference Slot”.
4.3.1.3
If the UTOPIA interface is configured for level 2 MPHY mode, the framer port number is
transported via the UTOPIA address bits. In UTOPIA level 1 and UTOPIA level 2 single
PHY mode the framer port number is mapped into the ATM Header (see
Data Sheet
selected for T1 ports.
S A R
S D U
P D U
A TM H eader
= S e g m e n ta tio n & R ea sse m b ly
= S e rvice D a ta U n it
= P ro to co l D a ta U n it
shows the AAL type 0 SAR-PDU. It is possible to fill only part of the SAR-PDU
5 o cte ts
Segmentation
Transport of the Framer Port Number
when frame-based SDT is selected
when CRC multiframe-based SDT is selected for E1 ports
when superframe-based SDT or extended superframe-based SDT is
SAR-PDU of AAL Type 0
A TM -S D U = S A R -P D U
A A L user info
N o cte ts
4 8 o cte ts
53
PXB 4219E, PXB 4220E, PXB 4221E
D um m y Fill
Operational Description
Chapter
A TM Layer
IWE8, V3.4
2003-01-20
5.2.3).
Aal0