MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 112

• Manufacturer Part Number: MT92220BG
• Description: Description = 1023 Channel Voice Over IP/AAL2 Processor ;; Package Type = Epbga ;; No. Of Pins = 608
• Manufacturer: Zarlink Semiconductor

112
RTP Common PDV
Absorption Structure
Pointer
A
B
AR
SR
LE
PLX
FL
CPE
BS
Max CN Packet
Length
Number of Channels
RPM
Field
Pointer to PDV monitoring and absorption structure that will be used by this
channel. This pointer is in units of 32 bytes.
Clock Recovery channel A. When this field is set, an Adaptive Clock Recovery
RTP Event Structure using this packet’s sequence number and time stamp fields
will be written to the Adaptive clock recovery queue A.
Clock Recovery channel B. When this field is set, an Adaptive Clock Recovery
RTP Event Structure using this packet’s sequence number and time stamp fields
will be written to the Adaptive clock recovery queue B.
Always Report Enable. Always generate an RX Disassembly Event Report
Structure when a packet is received and this field is set. Used for debugging only.
Slip Report Enable. When this field is set, any underrun or overrun will be reported
via an RX Disassembly Event Report Structure.
Packet Loss Compensation Enable. When set, the RTP time stamp will be used to
align packets in the RX circular buffer for proper dejittering. When cleared, packets
will be written back-to-back in the RX Circular buffer regardless of their time stamp.
Report packets that are longer than expected. When this field is set and a packet is
received containing more than Max Expected Payload Size in Frames payload
samples, an RX Disassembly Event Report Structure will be generated.
Report packet loss. When this field is set and Packet Loss Compensation is set,
packets received that are not written immediately after the last received packet in
the RX circular buffer will cause an RX Disassembly Event Report Structure to be
generated (indicating a packet loss).
CN PDV Monitoring Enable. When cleared, CN packets will not affect PDV
monitoring fields. When set, CN packet will be assumed to contain as many frames
as the last packet that was received. This assumption may not always be correct
when the number of samples in a packet changes in time.
RX Circular Buffer Size. This field indicates the size of RX Circular Buffer that will
be used to dejitter incoming packets.
“000” = 256 bytes;
“001” = 512 bytes;
“010” = 1024 bytes;
“011” = 2048 bytes;
“100” = 4096 bytes;
others = reserved.
CN packets longer than this value will be truncated to this length.
This field contains the number of channels that are interleaved in a T1/AAL1 like
manner in each packet. The field ranges between 1 and 255.
Reset PDV Monitoring. When this bit is written to ‘1’ by the software, the next
received packet will begin a new PDV monitoring period and, at the time of the
reception of that packet, the RPM bit will be cleared automatically by the hardware.
When PDV monitoring is reset, the Minimum Delta and Maximum Delta are set to
the delta of the first packet received in the new PDV monitoring period.
Table 45 - Fields and Description
Zarlink Semiconductor Inc.
Description