mt90503 Zarlink Semiconductor, mt90503 Datasheet - Page 75

• Manufacturer Part Number: mt90503
• Description: 2048vc Aal1 Sar
• Manufacturer: Zarlink Semiconductor

five MSBs select a number of multiframes and the five LSBs a number of frames. In strict muliframing, the five LSBs
are always set to '00000'; they can be any value in FASTCAS.
Setting the multiframing standard in the circuit emulation (CE) field will change the way the information is read from
the TDM circular buffers, as well as the standard that is used to interpret the p-byte. In addition, setting the CE bits
to a CAS setting will indicate to the RX_ SAR that CAS signalling bits should be expected at the end of the AAL1
structure.
The payload size represents the number of TDM bytes in the cell and does not include pointer or AAL1-bytes.
4.4.3
Within the four categories of errors, there are eleven possible errors. All but slip errors (overruns and underruns)
pertain only to AAL1 cells.
For the following errors, the only action taken is the generation of an error report structure (Section 4.4.4):
•
•
•
•
AAL1 with pointer, non-p-type cell
AAL1 with pointer, p-type cell
CBR-AAL0
loss/misinsertion
CRC errors
CRC/sequence number parity errors
multiple cell loss
p-byte parity
P-byte errors
AAL1 Byte
Slip errors
Category
Cell
Errors
Format
Number Parity error
P-byte framing error
P-byte out-of-range
P-byte parity error
Multiple cell loss
cell misinsertion
CRC/Sequence
Single cell loss
P-byte absent
CRC error
Underrun
Overrun
Error
Table 24 - Payload Sizes for Various Cell Formats
Table 25 - RX_SAR errors
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
AAL1 cells
Coverage
all cells
all cells
Zarlink Semiconductor Inc.
TDM Bytes
MT90503
16
16
16
75
CSI = 1, CRC = 010, Seq. num = 110, parity bit = 1.
Even parity not observed: a parity error has occurred.
Sequence numbers 1, 2, 4 received. Cell 3 has been
lost
Sequence numbers 1, 2, 4, 3 received. A cell
misinsertion has occurred
Sequence numbers 1, 2, 5 received. Cells 3, 4 have
been lost.
P-byte = 0100110, parity bit = 0. Even parity not
observed: a p-byte parity error has occurred
P-byte received = 0x52, Structure length for that VC =
0x18. P-byte is too large
P-byte is 0x15 when 0x17 was expected.
See Figure 31.
See Figure 31.
Bytes Transmitted
17
18
16
Example
Payload Size
Data Sheet
16
16
16