The document discusses point-to-point radio links in the 17 GHz frequency band for transmitting broadband data over geographic distances. It compares 17 GHz solutions to 5.4 GHz solutions, noting that 17 GHz has higher capacity but shorter range and is more affected by heavy rain. The document also describes SIAE Microelettronica's Alfo Plus radio system for 17 GHz links, including its technical specifications, features, adaptive modulation, traffic management, header compression, and physical characteristics.

1. Link punto - punto nella banda libera 17 GHz

2. Introduzione
I link PtP o “ponte radio” è un collegamento che trasporta via
radio dati a larga banda su distanze geografiche.
Dati: protocollo TCP/IP ed Ethernet
Quando uso un ponte radio?
 Collegamento cablato non è possibile o
non economico
 Quando i tempi di realizzazione sono
stretti
Pag. 2 - 28/09/2012
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3. Normativa di riferimento
Banda libera ?
 Piano di ripartizione delle frequenze (2009)
 Banda: 17,100 – 17,300 GHz
 Uso collettivo in sistemi a corto raggio per la
trasmissione dati a larga banda ad alta velocità
 Servizio: Fisso, SRD Hiperlan
 Regime di "libero uso“ / “autorizzazione generale“
 Normativa internazionale: ERC/REC 70-03
Pag. 3 - 28/09/2012
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4. Soluzioni 17 GHz vs 5,4 GHz
 Normativa: stesso inquadramento (ERC/REC 70-03)
 Potenza di trasmissione (e.i.r.p.):
◦ 5,4 GHz: 1W
◦ 17 GHz: 0,1 W
 Capacità di traffico reale
◦ 5,4 GHz: 300 Mbp/s (Half Duplex)
◦ 17 GHz: >500 Mbp/s (Full Duplex)
 Distanza di collegamento tipica LOS
◦ 5,4 GHz: 30 km*
◦ 17 GHz: 10 km*
* Availability: 99,95 %; ITU Rain Zone = 30mm /h
Pag. 4 - 28/09/2012
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5. Soluzioni 17 GHz vs 5,4 GHz
 Collegamento nLOS / NLOS
◦ 5,4 GHz: Si
◦ 17 GHz: No
 Tecnologia Mulptiplex
◦ 5,4 GHz: TDM
◦ 17 GHz: FDM
 Latenza
◦ 5,4 GHz: > 1 ms
◦ 17 GHz: < 1 ms
 Effetto agenti atmosferici
◦ 5,4 GHz: nessun effetto
◦ 17 GHz: attenuazione segnale precipitazioni intense
Pag. 5 - 28/09/2012
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6. Soluzioni 17 GHz vs 5,4 GHz
La soluzione 17 GHz si sceglie quando:
 Lunghezza del collegamento entro 10 Km
 Collegamento LOS
 La banda richiesta è importante
 La latenza è particolarmente critica
 Non ci sono più canali 5,4 GHz disponibili
Attenzione: è necessario fare lo studio di tratta con cura
Pag. 6 - 28/09/2012
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7. SIAE Microelettronica
 Società Italiana a Capitale Privato
 Sede principale a Cologno Monzese (Milano)
 Presente dal 1952 nel campo delle telecomunicazioni
 650 Dipendenti, di cui 200 dedicati all’attività di R&D
 Più di 150.000 collegamenti installati in più di 70 paesi
Pag. 7 - 28/09/2012
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8. Caratteristiche principali
Alfo Plus
 Full Outdoor
 Interfacce: 2xGbE elettriche con POE+/1 GbE + 1 SFP
 Capacità: 450 Mbps@ 56MHz (no HC) , 1Gbps (HC)
 Modulazioni da 4 a 256/512/1024 QAM
 Canali da 7, 14, 28, 40, 56 MHz
 ACM 100dB/s (400 cambi/s)
 Configurazion1 N+0, 1+1…
Pag. 8 - 28/09/2012
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9. Ponte radio configurazione 1+0
Eth2 Eth1, PoE+
Eth2 Eth1, PoE+
Switch
Switch
Pag. 9 - 28/09/2012
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10. Caratteristiche fisiche
 Dimensioni:
254x254x175 mm
 Peso:
5,5 Kg
 Temperatura:
-33 a +55 C°
 Protezione:
IP65
 Consumo:
<35W
Pag. 10 - 28/09/2012
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11. Funzionalità Ethernet e QoS
 MAC switching, Learning and Ageing
 Jumbo Frame fino a 10Kbytes
 Profili di banda per servizi Ethernet secondo MEF 10.2
 802.1Q VLAN/VLAN stacking Q-in-Q e riscrittura VLAN
 IEEE 802.3x Controllo di Flusso
 QoS basata su VLAN (IEEE 802.1p), MPLS Exp BIT, ToS/DSCP (IPV4 or IPV6)
 Tail Drop, Queue Drop, RED/WRED, Strict Priority, WFQ
 Frammentazione dei frame Ethernet
 IEEE 802.1d STP (Spanning Tree Protocol)
 IEEE 802.1v RSTP (Rapid Spanning Tree Protocol)
 IEEE 802.1ag OAM (Operation, Administration and Maintenance) / ITU-T Y.1731 / IEEE 802.3
ah
 IEEE 802.3ad LACP - Link Aggregation Control Protocol o Line Trunking o Link Aggregation
 Gestione completa del sincronismo (Synchronous Ethernet, IEEE 1588v2 PTP)
 ELP (Ethernet Line Protection)
 LLF (Link Loss Forwarding)
 Selective RMON – Statistiche su base porta e su base VLAN
Pag. 11 - 28/09/2012
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12. Modulazione adattativa
 ACM Adaptive Code Modulation with 10 profiles
 Hitless modulation and code selection 4 to 1024QAM
 MSE based hitless modulation switch
Pag. 12 - 28/09/2012
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13. Gestione del traffico
Bandwidth Congestion Queuing Scheduling
Profile Avoidance
BW profile: Processes: Processes: Algorithms:
Per Port RED 8 +1 queues Strict Priority
Per Vlan WRED Variable length WFQ
Mixed
Pag. 13 - 28/09/2012
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14. Packet Header Compression
• ETHERNET OPTIMIZATION incremento dal 2 al 7 %
O O O
IFG PAYLOAD IFG PAYLOAD IFG PAYLOAD IFG
H H H
• HEADER COMPRESSION incremento dal 10 al 200 %
Pag. 14 - 28/09/2012 ALFOplus - SG - April 2012
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All rights reserved © SIAE MICROELETTRONICA

15. Packet Header Compression
• ETHERNET OPTIMIZATION incremento dal 2 al 7 %
• HEADER COMPRESSION incremento dal 10 al 200 %
O O O
PAYLOAD PAYLOAD PAYLOAD
H H H
Pag. 15 - 28/09/2012
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16. Funzionamento compressore
Si trasmette una label lunga 12 bits al posto di lunghi e
ripetuti header:
MACs src and dest
 Operazione HW (5 us)
MPLS Labels
 Protetta CRC VLAN IDs
 Layer 1-4 IPV6 Flow ID
IPs addresses
UDP ports
RTP/GTP
Compressed in
10/12bits context
CONTEXT LABEL
Pag. 16 - 28/09/2012
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17. Guadagno del compressore
Packets size
1000
Distribution
950
VoIP with eNodeB (IP Tunneling) [2 levels HC] 64B
802.1ad + MPLS + IPv4 + UDP + RTP
900 >1KB
Maximum L1 equivalent throughput [Mbps]
802.1Q
850 Header optimization (no header compression) 65B-250B
Others
800 Size
Applications
750
Others Distribution
700
social
650
VoIP
600
Browser
550 P2P
500
450
400
64 264 464 664 864 1064 1264 1464
Packet size [bytes]
Pag. 17 - 28/09/2012
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18. Sistema di gestione
 Locale: Web-LCT
 Remoto: SNMP (NMS5-UX)
Pag. 18 - 28/09/2012
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19. Grazie