Line Up of SIAE FE

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22 LINEUP OF ETHERNET TRAFFIC (FOR IDU WITHETHERNET MODULE ONLY)

22.1 GENERAL

This paragraph deals with lineup of V12252 Ethernet module with details of SCT/LCT program related only

to Ethernet application.

Assuming that the radio link is already in service, with correct frequency, output power and correct antenna

alignment, the line up procedure for different kinds of connection set up of a radio link AL, equipped with

LIM Ethernet/2 Mbit/s module, is hereafter described:

1. Local Lan1 port to remote Lan1 port connection LAN per port, see Fig.99

2. Local Lan1 port to remote Lan1 port connection with only VLANs

3. 3 to 1 port connections, see Fig.111.

Settings here below are intended to be done both into local and remote radio equipment.

22.2 LOCAL LAN1 PORT TO REMOTE LAN1 PORT (TRANSPARENTCONNECTION LAN PER PORT)

Settings for Untagged and Tagged Traffic

Fig.99 - Local Lan1 port to remote Lan1 port connection

The lineup of Ethernet traffic is made with the help of SCT/LCT program.

Please refer to Fig.100. First selection is Ethernet throughput and modulation scheme, in this example we

select 16 Mbit/s and modulation 16QAM (max throughput and modulation scheme depend on terms of li-

cence provided by Siae Microelettronica).

Select configuration 1+0 or 1+1 according system requirements. Inside LCT, select Tributarywindow. If 2

Mbit/s tributaries are needed, inside the Tributarywindow it is possible to activate a 2 Mbit/s input/output

on the front panel. When the activation of required 2 Mbit/s tributaries is completed, all the others 2 Mbit/s

streams are automatically used for the Ethernet traffic. For instance with a 8x2 Mbit/s capacity, if we use

two 2 Mbit/s the capacity assigned to Ethernet circuits is automatically set to 6x2 = 12 Mbit/s full duplex.

Radio

port 1

switch

Lan1

Radio

port 1

switch

Lan2

Lan3

Nx2

Mbit/sLocal

Lan1

Lan2

Lan3

Nx2

Mbit/s

Remote
http://0.0.0.0/http://0.0.0.0/http://0.0.0.0/http://0.0.0.0/


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Fig.100 - Selection of Ethernet Throughput

See Fig.101 for General settings for the switch. All the used ports must be Enabled, so enable Lan1 and

Internal Port, see Fig.102.

The other ports should be disabled. The correct cable crossover arrangement must be selected too (see

Fig.102). At the end of Lineup, enable LLF if needed.

For Untagged traffic, connections are done with Lan per port selections. Referring to Fig.103 incoming traf-

fic at Lan1 exits at Internal Port and into Fig.105 incoming traffic at Internal Port exits at Lan1 port. This

connection are done for all Untagged traffic and all Tagged packets with Vlan Id not described into Vlan

Configuration Table.

If Vlan Configuration Table is blank all Tagged traffic follows the rules of Lan per port.

Possible selections of Ingress Filtering Check:

1. Disable 802.1q: no check of Virtual Lan tag is made and all packets follow Lan per port settings

2. Fallback: if Tagged packets have their Vlan Id into Vlan Configuration Table they follow the connec-

tion described into the table, otherwise they follow the Lan per port settings as Untagged packets

3. Secure: no Untagged packet transits; only Tagged packets with Vlan Id listed into the table can

transit. For all pass configuration, Disable 802.1 should be selected.

With Egress Mode as Unmodified the outgoing packets at Lan1 port exit Untagged or Tagged

exactly as they were Untagged or Tagged at the incoming port.


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Fig.101 - Switch general settings

Fig.102 - Lan1 interface settings

Link Loss

Forwarding

Histeresys

Click here for Port mapping and

VLAN configuration table

Output policy

for Tagged

packets: Level

2 priority, if

used, definedfor all the ports

for incoming

packetsalready Tagged


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Fig.103 - Vlan settings for Lan1

Fig.104 - Priority setting for Lan1 and Internal Port

Incoming

Untagged

packets at

Lan1 are sent

into output partqueue following

this selection.

In this example

packets are

inserted into

queue 0.


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With Priority disabled no check is done into 802.1p priority Tag. All types of packets go into Default Priority

Queue.

Fig.105 - Vlan settings for Internal Port

Fig.106 - Vlan Configuration Table


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22.3 LOCAL LAN1 PORT TO REMOTE LAN1 PORT (WITH VLANs)

Settings are done to transfer only Tagged traffic within Vlans.

We want that Vlan 701, 702, 710 and 1, 2, 3 can pass into the radio link and all the other Tagged or Untagged

packets should be blocked.

The line up of Ethernet module is made with the help of LCT/SCT program. Please refer to Fig.100. First selec-

tion is Ethernet throughput and modulation scheme, in this example we select 16 Mbit/s and modulation 16QAM

(max throughput and modulation scheme depends on terms of licence provided by Siae Microelettronica). Se-

lect configuration 1+0 or 1+1 according system requirements.

Inside LCT, select tributary window. If 2 Mbit/s tributaries are needed, inside the tributary window it is possible

to activate a 2 Mbit/s input/output on the front panel. When the activation of required 2 Mbit/s tributaries is

completed, all the others 2 Mbit/s streams are automatically used for the Ethernet traffic. for instance with a

16 Mbit/s capacity if we use two 2 Mbit/s the capacity assigned to ethernet circuits is automatically set to 16

2x2 = 12 Mbit/s full duplex.

SeeFig.101 for general settings for the switch. All the used ports must be enabled, so enable Lan1 and Internal

Port, see Fig.102. The other ports should be disabled. The correct Cable crossover arrangement must be se-

lected too. Enable LLF if needed, only at the end of line up.

Vlan settings for Lan1 and Internal Port should be like in Fig.107 with Ingress Filtering Check as Secure and

Engress Mode as Tagged. With this setting only Tagged packets with Vlan ID listed into the Vlan Configuration

Table can transit. All Untagged packets are blocked at the incoming port and outgoing Tagged packets dont

change.

A packet with Vlan ID XX can enter into the switch only if Incoming Port (Ingress port) is a member of the Vlan

XX, same packet will exit only from ports (Engress Port) which are members of Vlan XX. Vlan membership is

described into Vlan Configuration Table. A port can be member of no one, one or more Vlans. See Fig.108 for

Vlan Configuration Table settings for our example.

Fig.107 - Virtual Lan input and output settings at Lan1 port


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Fig.108 - Vlan Configuration Table with some Vlans

Tagged incoming packet can be treated with FIFO policy or on the basis of their 802.1p priority tag and

ToS/DSCP value for IP packets. There are 4 queue at each output port. The decision about to which output

queue to send a packet is defined into Ethernet switch window selections for 802.1p tag. Into Ethernet

switch window it is possible to select ToS/DSCPbutton to open window ToS/DSCP, in this window each

incoming ToS/DSCP value is associated with an output queue so it is possible to change the priority of the

incoming packet.

When no info on priority is available, the packet is sent to Default Priority Queue using FIFO policy.

Into Lan1 window select Priority (802.1q), into priority box there are some selections: with "Disable"

switch doesnt look at priority tag; with 802.1p switch looks at Tag 802.1p only; with IpToS for IP packetsonly switch looks to ToS/DSCP identifier (into IP frame) only; with 802.1p IpToS switch looks first to

802.1p tag and secondly to ToS/DSCP, see Fig.110; with IpToS802.1p switch looks first to ToS/DSCP and

secondly to Tag 802.1p.

Note: with IpToS switch looks to IP packet and ToS/DSCP doesnt matter if the packets are tagged with

802.1p or not.

In this example incoming tagged are tagged and it is necessary to transfer the packets with no change so

they must exit from output ports tagged, see Fig.109 and Fig.110.


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Fig.109 - Add a new Vlan ID to Vlan Configuration Table with output tagged

Fig.110 - Layer 2 and Layer 3 priority management

IncomingUntagged

packets at

Lan1 are sent

into output partqueue following

this selection.

In this example

packets are

inserted intoqueue 0.


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22.4 3 TO 1 PORT CONNECTIONS

Fig.111 - 3 to 1 port connections

In this example 3 local port must communicate with corresponding remote ports. All the ports share the

same radio channel but traffic originated and directed to Lan1 should be kept separated from traffic from

Lan2 and Lan3 and viceversa.

Lan1 to Lan1 connection should transfer tagged packets with Vlan 1, 701, 760 and untagged packets.

Unspecified tagged packets must be stopped. Lan2 and Lan3 have the same requirements. For all con-

nections IP packets with high priority TOS should transferred at minimum delay.

22.5 3 TO 1 PORT CONNECTIONS, SETTINGS FOR UNTAGGED TRAF-FIC

The lineup of Ethernet traffic is made with the help of LCT/SCT. Please refer to Fig.99.

First selection is Ethernet throughput and modulation scheme, in this example we select 16 Mbit/s and

modulation 16QAM (max throughput and modulation scheme depend on terms of licence provided by Siae

Microelettronica). Select configuration 1+0 or 1+1 according system requirements.

Inside LCT, select Tributary window.

If 2 Mbit/s tributaries are needed, inside the tributary window it is possible to activate a 2 Mbit/s input/out-

put on the front panel. When the activation of required 2 Mbit/s tributaries is completed, all the others 2

Mbit/s streams are automatically used for the Ethernet traffic. For instance with a 8x2 Mbit/s capacity if

we use two 2 Mbit/s the capacity assigned to Ethernet circuits is automatically set to 6x2 = 12 Mbit/s full

duplex.

Vlan Configuration Table will be defined in order to group traffic from Lan1, Lan2, Lan3 to Port1. All the

used ports must be Enabled.

Untagged traffic transits only if the selection for Ingress Filtering Check is disabled at each input port and

a separated Vlan for Untagged traffic is set up for each port. See Fig.101, Fig.102, Fig.111, Fig.112 andFig.113.

Each port of the switch must be associated with a different Default VLAN ID in order to maintain the traffic

coming from different separated LANs, Lan1 with default VID 3301, Lan2 with default VID 3302, Lan3

with default VID 3303, for Lan1 see Fig.113 and Fig.114.

The correct Cable Crossover arrangement must be selected too.

AL

radio

port 1

switch

Lan1

AL

radio

port 1

switch

Lan2

Lan3

Nx2Mbit/s

Local

Lan1

Lan2

Lan3

Nx2

Mbit/sRemote


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Fig.112 - Input and output setting for VLANs at Lan1 port

Fig.113 - Output port properties for VLAN 3301


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Fig.114 - Typology 3 to 1, Virtual Lan Configuration

With the above settings inside the VLAN configuration Table only Untagged traffic is forwarded accross the

bridge.

The same settings should be done inside the remote equipment. The above example shows the Virtual Lan

Configuration Table in case of a link carrying the traffic of 3 independent LANs connected to Lan1, Lan

2, Lan3, which is split at the remote end among the outgoing Lan1, Lan2, Lan3 ports, while using a

common radio link.

To prioritize some IP packets with high ToS/DSCP value it is possible to open PToS/DSCP window from

Ethernet switch window and select the values of ToS for which the packet is sent to high priority Queue,

see Fig.115.

Fig.115 - Output Queue selection on the basis of TOS/DSCP priority

Default VID assigned by

user to each port

Vlan 3301, 3302, 3303 are allowed to exit at Port1

with tags (Tagged). Different default Tags allow tokeep separate the traffic from Lan1, Lan2 and

Lan3 exiting at Port 1. At the remote end the traffic

is split and forwarded from Port1 to Lan1, Lan 2and Lan3 without Tag to preserve the original

format.

TOS value description DSCP value description

Packetswith AF43

priority

level will

go intoQueue 3 at

all ports

AF43 now goes to Queue 3, with this

button AF43 will go to Queue 2


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22.6 3 TO 1 PORT CONNECTIONS, SETTINGS FOR TAGGED AND UN-TAGGED TRAFFIC

If we want VLAN with Tag 701, 702 and 703 to transit between Lan1 and Port1 it is necessary to define

Port 1 and Lan 1 as members of VLAN1, 701, 760 (see Fig.116 for VLAN 701 and do the same for VLAN1,760).

The VLAN Configuration Table will look like Fig.117.

For Lan2 and Lan3 we cannot use the same Vlan if we want to maintain traffic from Lan 1, 2, 3 separated.

We must change the number of incoming Vlan for instance of 1, 701, 760 use 2001, 2701, 2760 for Lan

2 and 3001, 3701, 3760 for Lan3. Connected equipment to Lan2 port should be reprogrammed to use

Vlan 2001, 2701, 2760.

Connected equipment to Lan3 port should be reprogrammed to use Vlan 3001, 3701, 3760.

To prioritize Ip packets with high ToS/DSCP value it is possible to open PToS/DSCP window from Ethernet

switch window and select the values of ToS for which the packet is sent to high priority Queue 3, see

Fig.115. The same should be done inside the remote equipment.

Fig.116 - Output properties of VLAN 701


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Fig.117 - Typology 3 to 1, Virtual Lan Configuration Table with Vlan

22.7 3 TO 1 CONNECTIONS: EXAMPLES OF PRIORITY MANAGEMENT

Example 1: To assign to Lan1 and Lan3 low priority and to Lan2 high priority, while wanting Tagged

and Untagged to be treated in a fair manner on each queue do as follow: select Priority Disable for Lan1,

Lan2 and Lan3; select Default Priority Queue equal to Queue 0 for lan1 and Lan3 (see Fig.104). Select

Default Priority Queue equal to Queue 3 for Lan2 (as in Fig.118).

Outgoing Untagged packets will take priority tag defined into input port, in this case 0. Tagged frames keep

their tag.

Example 2: Wanting tagged frames to be treated according their actual priority and untagged packets with

low priority, all inputs should be configured as in Fig.Fig.119.

Layer 2 Priority assignment is not modified if inside the second folder of the LanX (1, 2, 3) configuration

window Untagged Frame Egress Mode = Unmodified is selected as in Fig. Fig.120.


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Fig.118 - Queue selection

Impostando questa cartella, i pacchetti senza tag arrivati alla Lan2 sono

trasmessi alle Code Porte di output. In questo esempio tutti i pacchetti entranti

nella Lan2 vengono inseriti nella Coda di output 3 delle porte di output.Priorit di Input: quando non selezionato Disable, le trame con tag sono

trasmesse alle code 0,1,2,3 secondo il valore di priorit porta di destinazione;

con Disable selezionato per questa porta la commutazione usa la DefaultPriority Queue per trame con tag e senza tag, e senza modifica reale di tag

nelle trame entranti con tag.


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Fig.119 - Management of tagged frames according with their priority tag


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Fig.120 - Incoming packets at Lan1 will exit to other ports unchanged according their incom-

ing status.


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