PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 519

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

13.3
13.3.1
13.3.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Transport
Transport
Overhead
Overhead
Overhead
Overhea
Overhea
Overhea
Section
Section
Pointer
Pointer
Line
Line
d
d
d
SONET/SDH Frame Mappings and Overhead Byte Usage
ATM Mapping
The S/UNI-2488 processes the ATM cell mapping for STS-48c (STM-16c) as shown below in
Figure 25. The S/UNI-2488 processes the transport and path overhead required to support ATM
UNIs and NNIs. In addition, the S/UNI-2488 provides support for the APS bytes, the data
communication channels and provides full control and observability of the transport and path
overhead bytes through register access. In Figure 25, the STS-48c (STM-16c) mapping is shown.
In this mapping, fifteen stuff columns are included in the SPE. No other options are provided.
Figure 25 ATM Mapping
Packet Over SONET Mapping
The S/UNI-2488 processes the Packet Over SONET mapping for STS-48c (STM-16c) as shown
below in Figure 26. The S/UNI-2488 processes the transport and path overhead required to
support Packet Over SONET applications. In addition, the S/UNI-2488 provides support for the
APS bytes, the data communication channels and provides full control and observability of the
transport and path overhead bytes through register access. Figure 26, the STS-48c (STM-16c)
mapping is shown. In this mapping, the SPE is used for POS Frames. Again, there is one path
overhead and 15 fixed stuff columns.
Figure 26 Packet Over SONET Mapping
G1
B3
C2
G1
F2
H4
Z3
Z4
Z5
B3
C2
F2
H4
Z3
Z4
Z5
J1
J1
D
U
F
X
E
D
S
T
U
F
F
F
X
E
S
T
F
F
I
I
D
U
F
X
E
D
S
T
U
F
F
F
X
E
S
T
F
F
I
I
ATM Cell
POS Frame
POS Frame
ATM Cell
4320 Bytes
4176 Bytes
4320 Bytes
4176 Bytes
ATM Cell
POS Frame
S/UNI-2488 Telecom Standard Product Datasheet
POS Frame
ATM Cell
Released
Bytes
Bytes
519
9
9