User's Manual

ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.E - 004 49
When enabled, the user can select which header have to be compressed considering the following maxi-
mum limits:
• the total header field size cannot exceed 124 bytes
• the total header field size after internal coding cannot exceed 118 bytes. the internal coding is re-
quired by SIAE switch in order to perform the compression task.
In Fig.18
are detailed the different header fields that can be selected with their weight in terms of header
field size and header field size after internal coding.
Fig.18 - Header compression
Header
field size
(Bytes)
Header field
size after
internal coding
(Bytes)

Ethernet

C-TAG (802.1Q)

Q-in-Q (802.1ad)
(default=1)

MPLS
Max number of MPLS labels (from 1 to 3), PW included
(default=1)

Control Word (RFC4385)

IP+

UDP

RTP
Tunneling OPv4 - IPv4/IPv6(IPv4+UDP+GTP-U+IPv4/IPv6+UDP+RTP)
IPv4 only (default)
IPv4 or IPv6
Max number of S-TAG (from 1 to 2)
+14 +12.5
+4 +2
--
+(4*n) +(2*n)
--
+(4*n) +(4*n)
+4 +3.5
--
+20 +19.5
+40 +39.5
+8 +8
+12 +12
+100 +99