VDSL Access Networks lectures 200809 Macekov KEMT FEI

VDSL Access Networks lectures 2008/09 Ľ. Maceková – KEMT – FEI –TU -KE

30 MHz Data down Data up up to 1, 5 km variable freq. bands

VDSL class I (asymmetric) II (symmetrical) Service type Downstrea m speed [Mbps] Upstream Reach

Fig. 2 General reference VDSL model (by ITU-T) [1]

Fig. 3 Functional reference model VTU-x by ITU -T [1]

Asymmetrical traffic ISDN or POTS VDSL down stream VDSL upstream frequency Symmetrical traffic ISDN

spectrum telephone frequency Fig. 6 DMT – VDSL spectrum (in combination with analog telephone)

Fig. 8 The different frequency plans for VDSL by ITU [1] (Opt = Optional

Tab. 2 An example of VDSL mask in downstreams DS 1, DS 2 described

STM – synchronous transport mode Fig. 9 VDSL transport modes possibilities [2]

Ø VDSL 2 - ITU-T G. 933. 2 (2006) - enhanced VDSL version –

Fig. 11 VDSL 2 spectrum utilization and comparison with ADSL 2 and ADSL 2+

Fig. 12 VDSL 2 profiles in comparison with ADSL and ADSL 2+

Tab. 4 VDSL 2 profiles [Wikipedia] Profi Bandwidt le h (MHz) Number of carriers

Fig. 1 ones more comparison ADSL and VDSL: data speeds and reach (4500 f

Ø FDSL – fiber DSL (but also other relevances) Fig. 15 [5] Using fiber

Ø BDSL – Broadcast DSL Subscriber lines Fig. 16 Architecture of BDSL technology [4]

References [1] ITU-T G. 993. 1 Recommendation, 2004 [2] W. J. Goralski: ADSL and

Slides: 22

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VDSL Access Networks lectures 2008/09 Ľ. Maceková – KEMT – FEI –TU -KE

30 MHz Data down Data up up to 1, 5 km variable freq. bands up to 52 Mbps split Upstream and Downstream Fig. 1 – VDSL architecture – max. downstream only to 300 m ([6],

VDSL class I (asymmetric) II (symmetrical) Service type Downstrea m speed [Mbps] Upstream Reach – best- / speed worst one [Mbps] [m] A 4 23, 268 4, 096 995 / 453 A 3 14, 464 3, 072 1344 / 729 A 2 8, 576 2, 048 (E 1) 1691 / 789 A 1 6, 4 2, 048 (E 1) 1791 / 843 S 5 28, 288 298 / 212 S 4 23, 168 397 / 261 S 3 14, 464 845 / 575 S 2 8, 576 1294 / 820 S 1 6, 4 1444 / 876 Tab. 1 Data speeds and reach by ETSI (Europe); for wires Φ 0, 4 mm

Fig. 2 General reference VDSL model (by ITU-T) [1]

Fig. 3 Functional reference model VTU-x by ITU -T [1]

Fig. 4 … by ITU [1]

Asymmetrical traffic ISDN or POTS VDSL down stream VDSL upstream frequency Symmetrical traffic ISDN or POTS VDSL down stream VDSL upstream frequency Fig. 5 Symmetrical and asymmetrical VDSL services

spectrum telephone frequency Fig. 6 DMT – VDSL spectrum (in combination with analog telephone) [7] Fig. 7 VDSL downstream (DS) and upstream (US) subbands alocation – generally [1] - see next slide. . .

Fig. 8 The different frequency plans for VDSL by ITU [1] (Opt = Optional (yes/no, DS/US)

Tab. 2 An example of VDSL mask in downstreams DS 1, DS 2 described in standard ITU-T G. 993. 1

STM – synchronous transport mode Fig. 9 VDSL transport modes possibilities [2]

Fig. 10 DSL network [6, 8]

Ø VDSL 2 - ITU-T G. 933. 2 (2006) - enhanced VDSL version – the goal: do not lose customers in competitive with “cable” Vo. IP, Internet, digital TV and Vo. D-HD providers - freq, band up to 30 MHz - symmetric up- and downstreams each of 100 Mbps (aggregate data speed 200 Mbps) - reach to 2, 5 km ( US 0 band - to 276 k. Hz, EC, TEQs) - several profiles - Zipper DMT (DMT based duplex – subcarrier bands, each 4 or 8 k. Hz wide – from 2048 to 4096 bands – see next fig. ) – allocation of subcarriers and data speed adaptation accordingly to immediate requirements of applications on the both sides of line - trellis encoding - STM and PTM supporting - interoperability with ADSL devices, there also several profiles (8) for different applications – see tab. 3 and fig. 12 in the next slides

Fig. 11 VDSL 2 spectrum utilization and comparison with ADSL 2 and ADSL 2+ Tab. 3 VDSL 2 profiles

Fig. 12 VDSL 2 profiles in comparison with ADSL and ADSL 2+

Tab. 4 VDSL 2 profiles [Wikipedia] Profi Bandwidt le h (MHz) Number of carriers Carrier bandwidth (k. Hz) Power (d. Bm) Max. Throughput (Mbit/s, downstream) 8 a 8, 832 2048 4, 3125 +17, 5 50 8 b 8, 832 2048 4, 3125 +20, 5 50 8 c 8, 5 1972 4, 3125 +11, 5 50 8 d 8, 832 2048 4, 3125 +14, 5 50 12 a 12 2783 4, 3125 +14, 5 68 12 b 12 2783 4, 3125 +14, 5 68 17 a 17, 664 4096 4, 3125 +14, 5 100 30 a 30 3479 8, 625 +14, 5 100

Fig. 1 ones more comparison ADSL and VDSL: data speeds and reach (4500 f = 1, 47 km, 18 000 feet=5, 5 km)

other x. DSL systems

Ø FDSL – fiber DSL (but also other relevances) Fig. 15 [5] Using fiber to span long distance; hybrid technology (optical / copper lines)

Ø PDSL - it was described already [5]

Ø BDSL – Broadcast DSL Subscriber lines Fig. 16 Architecture of BDSL technology [4] - standard submitted to Committee T 1 E 1. 4, - it is dedicated for distribution of more TV (up to several tens) channels, which share transport medium (twisted pairs) with analog teleph. line (point-to-multipoint technology) Analog. signals are digitized, and together with digital TV channels are compressed. There are used 3 subcarriers – 40 k. Hz, 80 k. Hz and 1, 2 MHz. . . , DSLAM; ATM technology

References [1] ITU-T G. 993. 1 Recommendation, 2004 [2] W. J. Goralski: ADSL and DSL Technologies. Sec. Edition. Osborne Mc. Graw. Hill, 2002. [3] ITU-T G. 933. 2 Recommendation, 2006. [4] Vaculík: Prístupové siete. ŽU v Žiline, 2000. [5] J. Dúha, P. Podhradský, P. Trúchly: Technológie v prístupových sieťach a procesy ich integrácie do NGN. (Projekt: NGN- multimédiá, multimed. ICT technológie, . . ) Bratislava, 2007. [6] L. Harte: Introduction to Digital Subscriber Line (DSL): Technologies, Operation and Systems. ALTHOS, 2005. [7] K. Blunár, Z. Diviš: Telekomunikačné siete, časť IV. . - skriptum ŽU v Žiline, 2000 [8]http: //www. cisco. com/univercd/cc/td/doc/product/dsl_prod/gsol_dsl/dsl_arch/gdsl arch. htm#1002608 [9]http: //findarticles. com/p/articles/mi_m 0 NUH/is_10_37/ai_107759816/pg_1? tag=a rt. Body; col 1