Installation and Operation Manual
Appendix
E Encapsulation over PSN
ACE-3105, ACE-3205 Ver. 5.2
4BTDM Service Encapsulation
E-13
Parameter Name
Purpose
M
A 2-bit modifier field that further defines the
failure if the L parameter was set:
•
L|M=000 means no failure; the payload must
be processed as received
•
L|M=100 means TDM failure; the TDM data is
invalid
•
L|M=010 means RDI state of the TDM
attachment circuit (AC)
FRG
Fragmentation field for services with CAS
LEN
Used to specify the length of the CESoPSN packet
(CESoPSN header size + the payload size) if it is
less than 64 bytes. If the total length is 64 bytes
or more, the LEN value is set to zero.
Sequence
number
Used to provide the common PW sequencing
functions, as well as the detection of lost packets
SAToP Control Word
The following figure illustrates the structure of the SAToPSN Control Word:
0
0
0
0
L
R
RSV FRG
LEN (6 bits)
Sequence number (2 bytes)
Figure
E-18. SAToP Control Word Structure
Table
E-13. SAToP Control Word Parameters
Parameter Name
Purpose
Bits 0–3
Structure bits that their value must be zero
L
If set, indicates that the TDM data carried in the
payload in invalid due to a TDM circuit failure
R
Remote receive failure (PSN RDI)
RSV
Reserved; must be set to zero
FRG
Fragmentation; must be set to zero
LEN
Used to specify the length of the SAToP packet
(SAToP header size + the payload size) if it is less
than 64 bytes. If the total length is 64 bytes or
more, the LEN value is set to zero.
Sequence
number
Used to provide the common PW sequencing
functions, as well as the detection of lost packets
