58
MDI/MDIX cross-over
For each LAN interface, cross-over cable can be set in Web Lct - Baseband - Lan - Cable Crossover as:
•
Auto - Lan recognizes automatically the connected cable type (Straight cable or Crossover cable)
•
MDI (NIC) - Manual crossover wiring type T568A
•
MDI-X (Switch) - Manual crossover wiring type T568B
With crossover cable it is necessary to use the same wiring format (MDI/MDI or MDI-x/MDI-x) on both
ends. In case of straight cable is the opposite (MDI/MDI-X or MDI-X/MDI).
VLAN functionality
ALFOplus works with IEEE 802.1q and 802.1p tag. Tag is made up with:
•
a fixed word of 2 bytes
•
3 bits for priority according with 802.1p
•
1 fixed bit
•
12 bits VLAN identifier (VLAN ID) according with 802.1q.
Switch cross-connections are based on Vlan Configuration Table where input and output ports or only out-
put ports should be defined for any used VID. Vlan ID (VID) has a range from 1 to 4095.
Ethernet Flow Control (802.3x)
A network device asks its adjacent devices to send a pause frame because the input is faster it can process.
The protocol used for this purpose is the flow control (802.2x).
Port Based VLan
Port Based VLan (or Lan Per Port) allows to share the Ethernet traffic (Ingress or Egress) in the internal
SIAE switch.
7.1.5
Synchronisation
Into ALFOplus a synchronisation circuit, called SincE and defined by the standard G.8264, gets the syn-
chronisation signal from the following different sources:
•
LAN1
•
LAN2
•
radio
•
Internal source
As shown in
the clocks extracted from the sources are sent to a selection circuit that chooses one
of the signals depending on the control sent by a selection logic.
This latter acts on the base of alarm roots (Synch Loss, Synch Drift, Holdover Freerunning), on the base
of assigned priority, manual forcing and preferential switch.
The selected clock drives an oscillator through a PLL circuit. The oscillator will generate the required syn-
chronisation for the frame generation. If no input signals are available the internal oscillator source is used
for the local restart.
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 ...