DSL Migrations towards Hybrid FttH, and associated regulation issues. Rob F.M. van den Brink - TNO
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1 DSL Migrations towards Hybrid FttH, and associated regulation issues Rob F.M. van den Brink - TNO 1
2 1. Network migration from Copper to Fiber Evolution of telco solutions in offering Broadband Voice band modems ISDN, ADSL1 < 6km copper ADSL2 ADSL2plus (VDSL2/CO) < 6km copper FttCAB VDSL2 < 1km copper FttH FttH (C) TNO 2
3 1. Network migration from Copper to Fiber Evolution of telco solutions in offering Broadband Voice band modems ISDN, ADSL1 < 6km copper ADSL2 ADSL2plus (VDSL2/CO) < 6km copper FttCAB VDSL2 < 1km copper FttH Hybrid FttH Curb G.fast Full FttH Basement (C) TNO Meter closet 3
4 1. Network migration from Copper to Fiber in small steps Fiber = expensive investments (digging, installation,..) Extending copper life (higher bitrates) = saving investment Smart deployments (Dynamic line management) increases efficiency How to increase the bitrate even further 1. Shortening copper loops step into next generation FttX 2. Widening spectra 3. Bonding DSL wire pairs 4. Vectoring DSL wire pairs Restrictions: regulation about unbundling Unbundling sometimes stimulates progress (competition) Unbundling sometimes blocks progress (prevents solutions) 4
5 2. Boosting bandwidth via shortening loops Basic principles CO CAB DP CP 100m-5000m 100m-1000m m Full copper: ADSL2, ADSL2+, VDSL2/CO Hybrid FttCab + copper: VDSL2/CAB Hybrid FttH +copper: G.fast Shortening loops = investments in Fiber, (expensive) so attractive only when limits of other DSL methods are reached 5
6 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB CP ADSL2+ ADSL2+ POTS 100m-5000m VDSL2 VDSL2 DPBO is an adequate solution ADSL2/CO + VDSL2/CAB can coexist with adequate Downstream Power BackOff (DPBO) 6
7 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB CP VDSL2 ADSL2+ POTS, ADSL 100m-5000m VDSL2 VDSL2 Both DSL systems will suffer significantly VDSL2/CO + VDSL2/CAB cannot coexist performance will degrade from both 7
8 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB DP CP ADSL2+ 100m-5000m POTS VDSL2 G.fast ADSL2+ G.fast VDSL2 UNCLEAR, probably UNLIKELY ADSL2/CO + VDSL2/CAB + G.fast/DP coexistant? unclear if G.fast/DP should account for VDSL2/CAB 8
9 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB DP CP G.fast POTS-only 100m-5000m VDSL2 G.fast VDSL2 Will hardly make any difference VDSL2/CAB + G.fast/DP coexistant? unclear if G.fast should account for VDSL2/CAB 9
10 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB DP CP POTS-only 100m-5000m G.fast G.fast Works POTS/CO + G.fast/DP will coexistist but is this realistic? 10
11 2. Boosting bandwidth via shortening loops Consequences for unbundling multi node deployments CO CAB DP CP G.fast G.fast more convenient, cut the existing cable without any multi-node deployment one can cut the cable 11
12 3. Boosting bandwidth via widening spectra Basic principles, up to 30 MHz VDSL2 Bandplans, up to 12, 17 and 30 MHz 998-M2x-A [1]: B8-4, (8x) 998-M2x-M [2]: B8-5, (8x) 998-M2x-A [3]: B8-4, (12x) 998-M2x-M [4]: B8-5, (12x) 138k 276k 138k 276k E17-M2x-NUS0 [5]: B ADE17-M2x-A [6]: B k 138k U3 12 D D E30-M2x-NUS0 [7]: B ADE30-M2x-NUS0-A [8]: B8-16 (c) TNO, k 138k U D3 D3 U D U widening gives some improvement in bitrate (only for very short loops), several possibilities, but you cannot combine all bandplans 12
13 3. Boosting bandwidth via widening spectra Consequences for unbundling compatible bandplans VDSL2 Bandplans, up to 12, 17 and 30 MHz 998-M2x-A [1]: B8-4, (8x) 998-M2x-M [2]: B8-5, (8x) 998-M2x-A [3]: B8-4, (12x) 998-M2x-M [4]: B8-5, (12x) 138k 276k 138k 276k E17-M2x-NUS0 [5]: B ADE17-M2x-A [6]: B k 138k U3 12 D D E30-M2x-NUS0 [7]: B ADE30-M2x-NUS0-A [8]: B8-16 (c) TNO, k 138k U D3 D3 U D U Option #1, select only bandplans that are spectrally compatible. Unbundling works well, just extending existing access rules 13
14 3. Boosting bandwidth via widening spectra Consequences for unbundling compatible bandplans VDSL2 Bandplans, up to 12, 17 and 30 MHz 998-M2x-A [1]: B8-4, (8x) 998-M2x-M [2]: B8-5, (8x) 998-M2x-A [3]: B8-4, (12x) 998-M2x-M [4]: B8-5, (12x) 138k 276k 138k 276k E17-M2x-NUS0 [5]: B ADE17-M2x-A [6]: B k 138k U3 12 D D E30-M2x-NUS0 [7]: B ADE30-M2x-NUS0-A [8]: B8-16 (c) TNO, k 138k U D3 D3 U D U Option #2, select only bandplans that are spectrally compatible. Unbundling works well, just extending existing access rules 14
15 4. Boosting bandwidth via bonding Basic principles { differential mode bonding diverting and combining bits via multiple transmission paths { phantoming is a special linear combination of,, U3 U3 15
16 4. Boosting bandwidth via bonding Basic principle Bitrate N lines, without bonding wire-pair number 16
17 4. Boosting bandwidth via bonding Basic principle bonding them all Bitrate N lines, without bonding Bitrate 2N lines, all bonded, just a doubling of transceivers wire-pair number 17
18 4. Boosting bandwidth via bonding Basic principle bonding them partially Bitrate N lines, without bonding Bitrate >N lines, several bonded, just an increase of transceivers wire-pair number 18
19 4. Boosting bandwidth via bonding A typical Dutch city Bold markers denote % has a double wire pair >70% in this city (example) 19
20 4. Boosting bandwidth via bonding Consequences for unbundling - None Bonding = just an increase of transceivers (multiple independent systems) Can be applied without changing access rules 20
21 5. Boosting bandwidth via vectoring Basic principle DSLAM Signal processing for cancellation of crosstalk Vector group: Coordinated approach of multiple systems Signal processing to cancel crosstalk Transmission paths remain independend 21
22 5. Boosting bandwidth via vectoring Basic principle all DSL systems in a vector group Bitrate Wire pair number 22
23 5. Boosting bandwidth via vectoring Basic principle all DSL systems in one vector group Bitrate Bitrate Wire pair number Significant increase of bitrates Wire pair number 23
24 5. Boosting bandwidth via vectoring Basic principle most DSL systems in one vector group Bitrate Bitrate Wire pair number Small / minor increase of bitrates vector group Wire pair number 24
25 5. Boosting bandwidth via vectoring Basic principle DSL systems in multiple vector groups Bitrate Bitrate Wire pair number Small / minor increase of bitrates vector group #1 vector group #2 25
26 5. Boosting bandwidth via vectoring Basic principle DSL systems in multiple vector groups Bitrate cabinet crosstalk that is not cancelled Cable Branch #2 Cable Branch #1 Unless vector groups are separated via branches.. significant increase of bitrates 26 vector group #1 vector group #2 Separation is a way to cope with system limitations DSL Migration towards hybrid-ftth & regulation -dr. Rob F.M. van den Brink -TNO
27 5. Boosting bandwidth via vectoring Consequences for unbundling Significant! If vectoring is used: full coordination of all DSL modems from a common system or nobody can gain from vectoring Consequence: in practice: all vector equipment from the same vendor in practice: a single transmission operator to operate them cannot offer unbundling via physical layer use another type of unbundling! 27
28 6. Different possibilities for unbundling Aims for all unbundling principles: fair access for multiple operators enable efficient use of available copper capacity Two different approaches: Physical unbundling line sharing (spectrum separation), loop unbundling (wire separation), layer 1 unbundling, Virtual unbundling / VULA link unbundling (Ethernet VLAN s), above layer 1 unbundling, bitsream access, 28
29 6. Different possibilities for unbundling Current status: Physical unbundling = commonly used Virtual unbundling = incidently allowed as temporary measure Mid 2010: EC allowed it for UK and Austria, as temporary measure, but not as a long term alternative to physical unbundling Vitual unbundling requires: Single DSL operator controls all lines Agreements to ensure fair access for other operators This is a big challenge! If fora of regulator+operators cannot agree on this, nobody can take advantage of any vectoring 29
30 6. Different possibilities for unbundling (C) TNO ADSL2 ADSL2plus (VDSL2/CO) < 6km copper Full copper + (ADSL/CO, VDSL2/CO) Physical unbundling adequate Virtual unbundling not needed FttCAB (C) TNO VDSL2 < 1km copper Hybrid FttCab + VDSL2/Cab: Physical unbundling fair, but restrictive Virtual unbundling desired for vectoring FttH Hybrid FttH Full FttH G.fast Curb Basement Hybrid FttH + G.fast/DP: Physical unbundling too restrictive Virtual unbundling essential (C) TNO Meter closet 30
31 7. Summary 31
32 7. Summary Extending copper life is very attractive (postpones fiber investements) Essential to compete with cable operators FttCab was enabled by VDSL2 Hybrid FttH will be enabled by G.fast Various new DSL techniques can boost bitrates via copper 32
33 7. Summary Extending copper life is very attractive (postpones fiber investements) Essential to compete with cable operators FttCab was enabled by VDSL2 Hybrid FttH will be enabled by G.fast Various new DSL techniques can boost bitrates via copper Bonding + Vectoring attractive bandwidth boosters Bonding of quads will double bitrates Vectoring increases bitrate significantly Problem: vectoring is blocked by physical unbundling 33
34 7. Summary Extending copper life is very attractive (postpones fiber investements) Essential to compete with cable operators FttCab was enabled by VDSL2 Hybrid FttH will be enabled by G.fast Various new DSL techniques can boost bitrates via copper Bonding + Vectoring attractive bandwidth boosters Bonding of quads will double bitrates Vectoring increases bitrate significantly Problem: vectoring is blocked by physical unbundling Virtual unbundling can solve it all Requires a single transmission operator offering virtual unbundling Requires agreements on fair access challenge EC allowed it for UK and Austria, but only as a temporary measure 34
35 7. Conclusions Extending copper life is very attractive (postpones fiber investements) Essential to compete with cable operators FttCab was enabled by VDSL2 Hybrid FttH will be enabled by G.fast Various new DSL techniques can boost bitrates via copper Bonding + Vectoring attractive bandwidth boosters Bonding of quads will double bitrates Vectoring increases bitrate significantly Problem: vectoring is blocked by physical unbundling Virtual unbundling can solve it all Requires a single transmission operator offering virtual unbundling Requires agreements on fair access challenge EC allowed it for UK and Austria, but only as a temporary measure If extending copper life is essential, then start regulating virtual unbundling for G.fast and VDSL2/Cab 35
36 36
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