Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 58 of 198
10.6.8 RAW Payload Type Machine
The RAW payload type machine support the following bundle types:
• Unstructured
According to ITU-T Y.1413, Y.1453, MEF 8, MFA 8.0.0 and IETF RFC 4553 (SAToP).
• Structured without CAS
According to ITU-T Y.1413, Y.1453, MEF 8, MFA 8.0.0 and IETF RFC 5086 (CESoPSN).
• Structured with CAS
According to ITU-T Y.1413, Y.1453, MEF 8, MFA 8.0.0 and IETF RFC 5086 (CESoPSN).
10.6.8.1 Unstructured
Unstructured bundles usually carry the data of a whole TDM port. This port may be low-speed such as an E1, T1 or
Nx64k bit stream or high-speed such as an E3, T3 or STS1 signal. In an unstructured bundle, the packet payload is
comprised of N bytes of the TDM stream without regard for byte or frame alignment. In the receiving device, the
TDM data is extracted from the packet payload and inserted as a bit stream into the jitter buffer, from which it is
then extracted and sent to the TDM port.
Figure 10-39. SAToP Unstructured Packet Mapping
L2/L3
Header
Control
Word
TDM payload CRC
Ethernet
packet
N TDM bytes
TDM
bitstream
FRG bits = 00
(no fragmentation)
The packetization delay of an unstructured (SAToP) bundle is: T = N x 8 x the bit time of the TDM interface.
The minimum packetization time of an Ethernet packet for an unstructured (SAToP) bundle is as follows:
• 60 µs for high speed mode
• 125 µs for low speed mode
10.6.8.2 Structured without CAS
In a structured-without-CAS bundle, the packet payload is comprised of the assigned timeslots from N TDM frames
as illustrated in Figure 10-40.