Ethernet over VDSL Technical Specifications

Agenda –Rate – Reach –Band Allocation –SNR and BER –PSD mask and Power Backoff Algorithm –Rate Limitation –Splitters and Filters

Rate – Reach Data rate - reach is limited by channel capacity theorem Wire gauge: bigger is better The trade off: –The longer the distance the lower the bit rate –The shorter the distance the higher bit rate

Rate - Reach The effects of Wire attenuation and Far End Cross Talk (FEXT) increase with higher frequencies Multiple services (ADSL, E1, ISDN) and multiple EoV links in the same bundle are significant noise sources

ETSI Compliance, Long Reach The EoV solution is capable of dynamically allocating the carrier rate: –Compliance with ETSI 997 and 998 band allocation –Achieving longer distance of Km with 4 Mbps symmetrical

Band Allocation PSD [dbm/hertz] 0.9 Mhz3.75 Mhz8.0 Mhz F [Mhz] EoV 1 1 PSD [dbm/hertz] Mhz3.75 Mhz5.1 Mhz8.5 Mhz12.0 Mhz 998 Plan F [Mhz] PSD [dbm/hertz] Mhz3.0 Mhz5.1 Mhz7.05 Mhz12.0 Mhz 997 Plan F [Mhz] PSD [dbm/hertz] 0.6 Mhz2.0 Mhz4.8 Mhz F [Mhz] Long Reach EoV Mhz

Band allocation PSD [dbm/hertz] 3.75 Mhz8.0 Mhz F [Mhz] EoV Mhz<0.12 Mhz ADSL SHDSL POTS, BA-ISDN EoV assumes ISDN, ADSL or SHDSL may be operating on the same line 1 1

PSD [dbm/hertz] Mhz3.75 Mhz5.1 Mhz8.5 Mhz12.0 Mhz 997 and 998 Plans -60 F [Mhz] Band Allocation ETSI Plains 997 and 998 assumes no ISDN, ADSL or SHDSL services on the same line Other services VDSL Downstream 12 12

EoVE - Ethernet over VDSL ETSI compliant Special implementation of EoV that complies to ETSI 997 and 998 band allocation plans Special line Hardware supports symmetric 4:4 and 1:1 Mbps 1:1 band allocation: Downstream Mhz, Upstream Mhz 4:4 band allocation: Downstream Mhz, Upstream Mhz

EoV compliance to ETSI 997 and 998 plans EoV PSD [dbm/hertz] Mbps, Full Duplex -60 F [Mhz] PSD [dbm/hertz] F [Mhz] Mbps, Full Duplex

PSD Mask The Power Spectrum Density (PSD) is limited to avoid disturbance to other communication systems The EoV complies with the ETSI VDSL PSD requirements

PSD Mask –Maximum transmit power (upstream and downstream combined) is limited to 11.5dBm. –The ETSI PSD limit values for the PSD masks are: 40dBm/hz is allowed up to EoV band 60dBm/hz is allowed in the EoV band –The EoV conforms to the 60dBm/hz limit PSD [dBm/hertz] 40 dBm 60 dBm EoV

EoV PSD Mask EoV transmits at 60 dBm/hz PSD [dbm/hertz] 3.75 Mhz8.0 Mhz F [Mhz] Mhz<0.12 Mhz PSD Limit

Long range EoV Reach distance of up to 2.4Km over standard telephone lines Bandwidth of up to 4 Mbps symmetrical Achieved using the same modem components with different filters

Long Range EoV Band allocation PSD [dbm/hertz] 2.0 Mhz4.8 Mhz F [Mhz] Long Reach EoV 0.6 Mhz ADSL SHDSL POTS, BA-ISDN <0.12 Mhz2.3 Mhz

Power Backoff Algorithm The PBO function causes the NT side to transmit at the minimum possible PSD. This prevents interference and cross-talk in a mix of short and long loops in the same cable. Modems operating on short loops transmit less power than modems on long loops.

PBO procedure in EoV 1.The NT starts to transmit, using the minimum level of power defined in the standard 2.The NT, which is in the “ Tune Power Level ” state, increases its power level whenever it receives a request from the LT. 3.The LT sends requests for more power, until convergence is reached on the received signal, with a Signal to Noise Ratio (SNR) that guarantees a 6dB margin at full constellation.

Rate Limitation EoV supports configuration of line speed for tiered billing purposes EM2003 modules implement rate limitation through the VDSL carrier in these selectable speeds 0.7M, 1M, 2M, 3M, 4M, 5.5M, 7.5M, 8.5M, 11M Future EM2004 modules implement rate limitation in the ASIC in Kbps level increments Downstream and Upstream can be configured independently of each other The maximal bandwidth is limited by the physical link

Splitters and Filters The splitter separates the VDSL signal from low frequency services such as POTS, 2B1Q ISDN, 4B3T ISDN or ping-pong (smart phone) ISDN The splitter places a Low Pass Filter (ISDN/POTS Splitter) in parallel with a High Pass Filter (VDSL filter) Combines/separates the Transmit and Receive VDSL signals - Hybrid functionality. Filters leakage (echo)

Splitters and Filters POTS/ISDN Splitter EoV NT Passive Front End EoV LT Passive Front End Ethernet over VDSL Telephone Tx Rx

Network layer - Ethernet –EM2003 Supports Layer- 2 Switching –EM2004 Layer 2- 5 Ethernet Circuit switching –Advanced VLAN engine supports up to 4K VLANs –Supports IGMP, DiffServ, port trunking, BootP

Management Full SNMP management –Supports RMON (groups 1, 2, 3, 9) –Telnet, port mirroring –GUI through MegaVision or other SNMP compliant applications –Web based management through MegaVision

Management Ethernet over VDSL specific management options –vdsl-set-port-rate - selects speed of VDSL, manually set the Upstream and Downstream. –vdsl-auto-test-ports - sets automatic test for the VDSL links,which establishes link based on bundle SNR and BER

Management Statistics and counters –vdsl-set-ber-report - reports Bit Error Rate to the network management system –vdsl-get-port-snr - get the SNR per port –vdsl-get-eth-cnt - gets the Ethernet counters per port

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