Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 46 of 198
Figure 10-22. UDP/IP-Specific OAM Packet Format
0
0 1 2 3 4 5 6 7 8 9 0
1
01
2
01
3
1
OAM MSG Type
Service Specific Information
2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
OAM MSG Code
Source Bundle Identifier
Source Transmit Timestamp
0000
L Length OAM Sequence Number
R M
RES
Destination Bundle Identifier
Destination Receive Timestamp
Destination Transmit Timestamp
PSN-Specific Layers (with bundle identifier configured to identify OAM)
Table 10-18. UDP/IP-Specific OAM Payload Fields
Field
Description
L, R, M
Identical to those of the bundle being tested
Length
OAM message packet length (in bytes)
OAM Sequence
Number
Uniquely identifies the message. Its value is unrelated to the sequence number of the TDM data
packets for the bundle in question. It is incremented in query messages, and replicated without change
in replies.
OAM Msg Type
Indicates the function of the message. At present, the following are defined:
0: one way connectivity query message
8: one way connectivity reply message
OAM Msg Code
Information related to the message; its interpretation depends on the message type.
For OAM Msg Type=0 (connectivity query) messages, the following codes are defined:
0: Validate connection
1: Do not validate connection
For OAM Msg Type=8 (connectivity reply) messages, the available codes are:
0: Acknowledge valid query
1: Invalid query (configuration mismatch)
Service Specific
Information
Can be used to exchange configuration information between gateways. If not used, it must contain
zero. Its interpretation depends on the payload type. At present, the following is defined for AAL1
payloads:
Bits 16–23: Number of timeslots being transported, e.g. 24 for full T1
Bits 24–31: Number of 48-byte AAL1 PDUs per packet, e.g. 8 when packing 8 AAL1 AAL1 SAR PDUs
per packet
Source Bundle
Identifier
The bundle identifier used for TDM-over-Packet traffic from the source to the destination.
Destination
Bundle Identifier
The bundle identifier used for TDM-over-Packet traffic from the destination to source.
Source Transmit
Timestamp
The time the PSN-bound gateway transmitted the query message. This field and the following fields
only appear if delay is being measured. The resolution is configurable to 100 µs or 1 µs.
Destination
Receive
Timestamp
The time the destination gateway received the query message.
Destination
Transmit
Timestamp
The time the destination gateway transmitted the reply message.
For more details about OAM Signaling, see Section 10.6.17.