Kwikbit Inc. PTP55DP Manuale Utente
M4-2000
User Guide
Kwikbit M4-2000 User Guide
Confidential & Proprietary
- 20 -
M4-2000 Layer 2 Capacity: 5 GHz radios, 2 x 40 MHz
Packet
Size
MCS 3
16QAM 1/2
MCS 4
16QAM 3/4
MCS 5
64 QAM 2/3
MCS 6
64 QAM 5/6
MCS 7
256 QAM 3/4
64 byte
365.3
387.1
401.5
397.2
353.3
128
301.1
459.6
608.1
673.1
730.4
256
257.7
392.1
527.3
660.5
795.0
512
240.1
366.4
492.4
616.7
742.0
1024
232.7
354.4
476.8
596.9
718.1
1280
231.2
351.2
473.5
593.2
713.5
1518
230.3
351.1
471.7
590.8
710.5
Table 3.5.3b –M4-2000 throughput in Mbps – 2 x 5GHz radios, 40 MHz channel bandwidth
4.6.4 Header compression
Header compression improves data throughput by reducing the number of bytes sent over the air.
M4-2000’s header compressor examines ingress packet flows and removes Ethernet and IP header
bytes from continuous flows. The header de-compressor at the receiver then restores headers using
bytes from continuous flows. The header de-compressor at the receiver then restores headers using
previously cached values.
The header compression feature provides the following link enhancements:
The header compression feature provides the following link enhancements:
• Ingress packet classification determines compression profile (example: IPV4, IPV6)
• Within each profile, flows are assigned a compression context. A new context is
automatically established and runs as long as the flow is present. The context is discarded
when the flow ends
when the flow ends
• Up to 1024 contexts are supported
• Compression efficiency will vary. Best case:
o
IPV4: 34 bytes of Ethernet and IP header 4 bytes compressed header
o
IPv6: 54 bytes of Ethernet and IP header 2 bytes compressed header
Eth header
Packet Header Compression
Ethernet + IPv4
IP header
payload
cmp
payload
Compressed packet
Eth header
Ethernet + IPv6
IP header
payload
cmp
payload
Compressed packet