ADSL Tech Info

Introduction

This Page has usefull info for ADSL connections.

ADSL/ADSL2+ Vendor Codes

ALCB = Alcatel (now ST Micro)
ANDV = Analog Devices
BDCM = Broadcom
GSPN = Globespan
IFTN = Infineon
STMI = ST Micro
TMMB = Thomson Multimedia Broadband
P= iPrimus Marconi

DSL Technologies

 

ADSL Standard Common Name Downstream rate Upstream rate
ANSI T1.413-1998 Issue 2
ADSL
8 Mbit/s
1.0 Mbit/s
ITU G.992.1
ADSL (G.DMT)
8 Mbit/s
1.0 Mbit/s
ITU G.992.1 Annex A
ADSL over POTS
8 Mbit/s
1.0 MBit/s
ITU G.992.1 Annex B
ADSL over ISDN
8 Mbit/s
1.0 MBit/s
ITU G.992.2
ADSL Lite G.Lite)
1.5 Mbit/s
0.5 Mbit/s
ITU G.992.3/4
ADSL2
12 Mbit/s
1.0 Mbit/s
ITU G.992.3/4 Annex J
ADSL2
12 Mbit/s
3.5 Mbit/s
ITU G.992.3/4 Annex L
RE-ADSL2
5 Mbit/s
0.8 Mbit/s
ITU G.992.5
ADSL2+
24 Mbit/s
1.0 Mbit/s
ITU G.992.5 Annex L
RE-ADSL2+
24 Mbit/s
1.0 Mbit/s
ITU G.992.5 Annex M
ADSL2+
24 Mbit/s
3.5 Mbit/s

2.1 ADSL
Asymmetric Digital Subscriber Line

ITU G.992.1 – G.DMT – 8.0Mbit/s, 1.0Mbit/s
ITU G.992.2 – G.Lite – 1.5Mbit/s, 0.5Mbit/s
ITU G.992.3/4 – ADSL2 – 12Mbit/s, 1.0Mbit/s
ITU G.992.5 – ADSL2+ – 24Mbit/s, 1.0Mbit/s

2.2 SDSL
Symmetric Digital Subscriber Line

2.3 SHDSL
Symmetric high-speed digital subscriber line
ITU G.991
2.4 VDSL
Very high bit-rate Digital Subscriber Line
ITU G.993.1 – VDSL
ITU-T G.993.2 – VDSL2

Signal Level Guide

3.1 ADSL
Downstream SNR = 15 dB.
Higher is better, minimum = 6 dB.
Downstream Power = < 15 dBm.
Lower is better.
Upstream SNR = 10 dB.
Higher is better.
Upstream Power = < 15 dBm.
Lower is better.
Downstream Attenuation = < 30 dB
Lower is better, maximum = 60 dB.
Upstream Attenuation = < 30 dB
Lower is better, maximum = 60 dB.

3.2 ADSL2+

Downstream SNR = 06 dB.
Higher is not better, within range is better = 05 – 07 dB.
Downstream Power = < xx dBm.
Lower is better.
Upstream SNR = 06 dB.
Higher is not better, within range is better = 05 – 07 dB.
Upstream Power = < xx dBm.
Lower is better.
Downstream Attenuation = < 22 dB
Lower is better, maximum = 22 dB (for 10mbps), 12 dB (for ~25mbps).
Upstream Attenuation = < 22 dB
Lower is better, maximum = 22 dB (for 10mbps), 12 dB (for ~25mbps).

Attenuation to Loop Length Conversion

10 dB ~ 0500 m
15 dB ~ 1000 m
25 dB ~ 2000 m
35 dB ~ 2500 m
NOTE
All readings are based on CPE, with average error margin of CPE taken into considerations.