Datasheet
____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 45 of 198
Field
Description
SSRC
Identifies the synchronization source. This identifier should be chosen randomly, with the intent that no
two synchronization sources within the same RTP session have the same SSRC identifier.
10.6.1.10
TDM-over-Packet Payload
This field can contain the following payload types:
• AAL1
• HDLC
• RAW (SAToP or CESoPSN formats)
• OAM (VCCV or UDP/IP-specific).
The AAL1, HDLC and RAW payload type details are provided in sections 10.6.6, 10.6.7 and 10.6.8, respectively.
The formats of the OAM payload types are described below.
10.6.1.10.1
VCCV OAM
When using inband performance monitoring, additional OAM packets are sent using the same bundle identifier as
the TDM data packets. The OAM packets are identified by having their first nibble (after the PSN specific layers)
equal to 0001 and must be separated from TDM data packets before further processing of the control word. The
PSN-specific layers are identical to those used to carry the TDM data.
Figure 10-21. VCCV OAM Packet Format
0
0 1 2 3 4 5 6 7 8 9 0
1
01
2
01
3
1
OAM MSG Type
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
OAM MSG Code
0001 FMTID RES Channel Type
Source Transmit Timestamp
Destination Receive Timestamp
Destination Transmit Timestamp
Service Specific Information
PSN-Specific Layers (with same Bundle Identifier as TDM Data Packets)
Table 10-17. VCCV OAM Payload Fields
Field
Description
FMTID
Must be set to zero
RES
Reserved and must be set to zero
Channel Type
Must be set to the value allocated by IANA for TDM-over-Packet VCCV OAM
OAM Msg Type
See Table 10-18.
OAM Msg Code
Source Transmit Timestamp
Destination Receive Timestamp
Destination Transmit Timestamp
10.6.1.10.2
UDP/IP-Specific OAM
When using a UDP/IP-Specific OAM, all OAM packet MUST use one of the bundle identifiers preconfigured to
indicate OAM (using OAM ID Table). The PSN-specific layers are identical for OAM packets (except for the bundle
identifier) to those used to carry the TDM data.