65
Fig.20 -
Means that the Serving Priority of the frames present in the queues will be:
•
the packets present in the Queue 7 will be transmitted with a Race 8/35
•
the packets present in the Queue 6 will be transmitted with a race 8/35
•
......
•
the packets present in the Queue 0 will be transmitted with a rate 1/35.
7.4
CONGESTION AVOIDANCE
The Congestion Avoidance is a protocol that permits to discard some frames before congestion occurs.
When the queue is full there is a congestion situation, this means that the resources are not enough to
serve all the packets and there is not enough room in the queue for more storage. In this case some packet
must be dropped. The choice of the dropping policy has different effects on the network. In case of con-
gestion, the TCP/IP protocol reduces the transmitting windows and therefore the amount of traffic trans-
mitted. The TCP/IP protocol increases the transmitting window very slowly to allow the network to solve
the congestion issues.
This means that, when congestion occurs, some selective dropping has to be done.
There are different policies of dropping that can be adopted:
•
Tail: in this case the last packets that come to the full queue are dropped (default configuration)
•
Queue: in this case all the queue is emptied, i.e. all the packets present in the Queue are dropped
•
Red: Random Early Discard: with this policy, before the Queue is full some incoming packets are
dropped randomly regardless if the frames are marked yellow or green (for more details on yellow
or green frames please refer to the paragraph
Ingress filtering policy (CIR/EIR according to
)
•
WRed: Weighted Random early Discard: with this policy, before the Queue is full some incoming
packets are dropped randomly. First are dropped the packets coloured in yellow and then are
dropped the packet coloured in green, see
.
Summary of Contents for ALFOplus
Page 1: ...ALFOplus Access Link Full Outdoor User Manual MN 00273 E 004 ...
Page 16: ...14 MN 00273 E 004 ...
Page 22: ...20 MN 00273 E 004 Fig 6 ALFOplus front side view 254 mm 254 mm 157 mm ...
Page 86: ...84 MN 00273 E 004 ...
Page 97: ...MN 00273 E 004 95 Fig 34 ODU with standard coupling kit O ring Coupling kit ...
Page 98: ...96 MN 00273 E 004 Fig 35 1 0 ODU installation 3 1 2 ...
Page 99: ...MN 00273 E 004 97 Fig 36 Polarization disk Reference ...
Page 100: ...98 MN 00273 E 004 Fig 37 1 1 ODU installation 3 1 2 ...
Page 101: ...MN 00273 E 004 99 Fig 38 1 0 antenna flange 4 3 4 1 2 5 114 60 ...
Page 102: ...100 MN 00273 E 004 Fig 39 1 1 antenna flange 3 1 2 4 7 5 6 ...
Page 109: ...MN 00273 E 004 107 Fig 49 Bend strain relief to lay along cable Crimp plug and strain relief ...
Page 112: ...110 MN 00273 E 004 Fig 53 PO0032 ...
Page 118: ...116 MN 00273 E 004 Fig 58 ALFOplus connectors Fig 59 SFP LC LC Fig 60 SFP LC OPEN END ...
Page 119: ...MN 00273 E 004 117 Fig 61 SFP LC SFP LC Fig 62 LC connector Fig 63 SFP into ALFOplus ...
Page 120: ...118 MN 00273 E 004 Fig 64 Locked connection Fig 65 Unplug SFP ...
Page 123: ...MN 00273 E 004 121 Fig 66 IP address setting Fig 67 Local area connection ...
Page 144: ...142 MN 00273 E 004 Fig 82 Event log window ...
Page 150: ...148 MN 00273 E 004 ...
Page 220: ...218 MN 00273 E 004 ...
Page 224: ...222 MN 00273 E 004 ...
Page 230: ...228 MN 00273 E 004 ...