VLL Services
7705 SAR OS Services Guide Page 157
M
(Modifier)
The M bits are a 2-bit modifier field. For SAToP, M is set to 00
as per RFC 4553. For CESoPSN, M is set according to RFC
5086, summarized as follows:
• When L bit = 0, and
M = 00 – Normal conditions
M = 01 – Reserved for future use
M = 10 – RDI condition for the attachment circuit (AC)
M = 11 – Reserved for CESoPSN
• When L bit = 1, and
M = 00 – TDM data is invalid
M = 01 – Reserved for future use
M = 10 – Reserved for future use
M = 11 – Reserved for future use
FRG The FRG bits in the CESoPSN control word are set to 00.
LEN The LEN bits (bits 10 to 15) carry the length of the CESoPSN
packet (defined as the size of the CESoPSN header plus the
payload size) if it is less than 64 bytes, and set to 0 otherwise.
Sequence number The sequence number is used to provide the common PW
sequencing function as well as detection of lost packets.
Table 21: Control Word Bit Descriptions (Continued)
Bit(s) Description
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