ZL50110_08 ZARLINK [Zarlink Semiconductor Inc], ZL50110_08 Datasheet - Page 68

• Manufacturer Part Number: ZL50110_08
• Description: 128, 256, 512 and 1024 Channel CESoP Processors
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

7.4
During normal operation, a situation may arise where a Loss of Service occurs. This may be caused by a disruption
in the transmission line due to engineering works or cable disconnection, for example. The locally detected LOS
should be transferred across the emulated T1/E1 to the far end. The far end, in turn, should propagate AIS
downstream.
The handling of LOS over a CESoP connection is typically performed using (setting/clearing) the L bit in the
CESoPSN or SAToP control word of the packet header.
Refer to Application Note ZLAN-159, Section 4.1 for details on a variety of different ways that LOS may be handled
in an application.
7.5
The ZL50110/11/12/14 family includes a large amount of on-chip memory, such that for most applications, external
memory will not be required. However, for certain combinations of header size, packet size and jitter buffer size,
there may be a requirement for external memory. Therefore the device allows the connection of up to 8 Mbytes of
synchronous ZBT-SRAM.
The following charts show how much memory is required by the ZL50111 (32 T1 streams) and the ZL50110 (8 T1
streams) for a variety of packet sizes (expressed in number of frames of TDM data) and jitter buffer sizes. It is
assumed that each packet contains a full Ethernet/MPLS/MPLS/RTP/CESoPSN header.
Loss of Service (LOS)
External Memory Requirement
8192
7168
6144
5120
4096
3072
2048
1024
0
4
External Memory Requirements for different packet sizes
32 T1 streams, with Ethernet/MPLS/MPLS/RTP/CESoPSN headers
Figure 20 - External Memory Requirement for ZL50111
8
16
Jitter Buffer Size, ms
ZL50110/11/12/14
Zarlink Semiconductor Inc.
32
68
64
128
256
1 frame packets
8 frame packets
16 frame packets
1 T3 stream (1 frame)
Data Sheet