zl50058 Zarlink Semiconductor, zl50058 Datasheet - Page 21

• Manufacturer Part Number: zl50058
• Description: 12 K Channel Digital Switch With High Jitter Tolerance, Per Stream Rate Conversion 2, 4, 8, 16 Or 32 Mbps , 48 Input And 48 Output Streams
• Manufacturer: Zarlink Semiconductor

ZL50057/8
Data Sheet
1.0
Unidirectional and bi-directional Switching Applications
The ZL50057/8 has a maximum capacity of 12,288 input channels and 12,288 output channels. This is calculated
from the maximum number of streams and channels: 48 input streams (32 Backplane, 16 Local) at 16.384 Mbps
and 48 output streams (32 Backplane, 16 Local) at 16.384 Mbps.
A typical mode of operation is to separate the input and output streams to form a unidirectional switch, as shown in
Figure 4 below.
BSTi0-31
BSTo0-31
32 streams
32 streams
INPUT
OUTPUT
LSTi0-15
LSTo0-15
16 streams
16 streams
ZL50057/8
Figure 4 - 12,288 x 12,288 Channels (16 Mbps), Unidirectional Switching
In this system, the Backplane and Local input streams are combined, and the Backplane and Local output streams
are combined, so that the switch appears as a 48 input stream by 48 output stream switch. This gives the maximum
12,288 x 12,288 channel capacity.
Often a system design needs to differentiate between a Backplane and a Local side, or it needs to put the switch in
a bi-directional configuration. In this case, the ZL50057/8 can be used as shown in Figure 5 to give 8,192 x 4,096
channel bi-directional capacity.
BSTi0-31
LSTo0-15
32 streams
16 streams
BACKPLANE
LOCAL
BSTo0-31
LSTi0-15
32 streams
16 streams
ZL50057/8
Figure 5 - 8,192 x 4,096 Channels (16 Mbps), bi-directional Switching
In this system setup, the chip has a capacity of 8,192 input channels and 8,192 output channels on the Backplane
side, as well as 4,096 input channels and 4,096 output channels on the Local side. Note that some or all of the
output channels on one side can come from the other side, e.g., Backplane input to Local output switching.
Note that in either configuration, the Backplane port can be operated in the Backplane 32 Mbps Mode, providing
512 channels on each of the 16 available input and output streams (BSTi0-15 and BSTo0-15) operating at a data
rate of 32.768 Mbps, in conjunction with the Local streams (LSTi0-15 and LSTo0-15) operating at 16.384 Mbps
(Local Non-32 Mbps Mode) or in conjunction with the Local streams (LSTi0-7 and LSTo0-7) operating at
32.768 Mbps (Local 32 Mbps Mode). Similarly, the Local port can be operated in the Local 32 Mbps Mode,
providing 512 channels on each of the 8 available input and output streams (LSTi0-7 and LSTo0-7) operating at a
data rate of 32.768 Mbps, in conjunction with the Backplane streams (BSTi0-31 and BSTo0-31) operating at
16.384 Mbps (Backplane Non-32 Mbps Mode) or in conjunction with the Backplane streams (BSTi0-15 and
BSTo0-15) operating at 32.768 Mbps (Backplane 32 Mbps Mode).
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Zarlink Semiconductor Inc.