Atec SC-ADSL User Manual

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS

SmartClass™ADSL

ADSL and IPTV Service Installation Tester

Key Features

• All-in-one tool for broadband services installation, including
copper,ADSL 1/2/2+, IP data, and IP video testing

• Fast and easy CableCheck copper test for ADSL2+:
longitudinal balance, capacitance, DVOM, and loadcoil
counter

• Thorough ADSL analysis, including graphical bits-per-tone
and SNR-per-tone

• IPTV STB emulation and QoS testing for broadcast and VoD
services

• ADSL Through mode enables technician to analyze DSL
statistics while viewing the IPTV stream

• Full protocol suite to verify connectivity with ATM OAM F4
and F5, PPP, static and dynamic IP, DNS support, IP PING,
TRACERT, HTTP, and FTP

• Ethernet Terminal Equipment (TE) mode to quickly isolate
customer premises equipment (CPE); Through mode to
replace customer modem

The JDSU SmartClass ADSL is the ideal tool for the technician installing and
maintaining asymmetrical digital subscriber line (ADSL) services. The tester
enables the technician to test loop quality, verify ADSL signal and performance, and
validate the customer’s Internet connection with unprecedented ease and speed.

SmartClass ADSL provides a full set of copper tests that qualifies the customer
loop for the delivery of newer services such as Internet protocol television (IPTV)
including longitudinal balance, a key copper metric to ensure external noise and
interference will not impact the quality of the IPTV streams with intermittent
pixelization and other disruptive effects. Digital volt-ohm meter (DVOM),
distance-to-short, leakage, opens/capacitance, and loadcoil counter tests
guarantee the copper loop does not exhibit connection issues and that the quality
of the copper pair is within allowed standards for ADSL2+ transmission in terms
of loop length and isolation. The unique CableCheck sequence provides a very
easy and fast method to qualify the copper loop for ADSL2+ services with a
pass/fail indication and programmable thresholds. The full-featured ADSL tests
quickly verify provisioned rates and quality, including up/down actual and max
rates, margin, attenuation, capacity, TX power, errors, alarms, asynchronous
transfer mode (ATM) optical amplifier module (OAM) and stats, Ethernet stats,
and bipolar transistor (BPT) graphs.

In addition, the SmartClass ADSL supports the storage and retrieval of pre-set
configurations and allows technicians to transfer results to a person computer
using a universal serial bus (USB) connection. The instrument’s features,
including its rugged design and field-replaceable AA batteries, make it the
essential ADSL installation tool.

WEBSITE: www.jdsu.com/test

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS

ADSL2+ has emerged as an IPTV-enabling technology of choice for network
operators and services providers seeking new revenue streams and competitive
positioning. At the same time consumers are signing up for multiple services in
this very competitive environment expecting the best service quality, making it
imperative that operators quickly and cost-effectively install ADSL2+ lines with
the confidence that their complex triple-play services are working well.

Delivery of ADSL services requires a single copper pair configuration of a
standard voice circuit with an ADSL modem at each end of the line, creating three
information channels—a high-speed downstream channel, a medium-speed
upstream channel, and a plain old telephone service (POTS) channel for voice.
Data rates depend on several factors including the length of the copper wire, the
wire gauge, presence of bridged taps, and cross-coupled interference. The line
performance increases as the line length is reduced, wire gauge increases, bridged
taps are eliminated and cross-coupled interference is reduced or is canceled out by
a good longitudinal balance characteristic of the copper wire. The modem located
at the subscriber’s premises is called an ADSL transceiver unit-remote (ATU-R),
and the modem at the central office is called an ADSL transceiver unit-central
office (ATU-C). The ATU-Cs take the form of circuit cards mounted in the digital
subscriber line access multiplexer (DSLAM), while a residential or business
subscriber connects their PC and ATU-R modem to a telephone outlet on
the wall.

ADSL2 has been specifically designed to improve the rate and reach of ADSL
largely by achieving better performance on long lines. ADSL2 accomplishes this
by improving modulation efficiency, reducing framing overhead,achieving higher
coding gain, improving the initialization state machine, and providing enhanced
signal processing algorithms. ADSL2+ further improves on the ADSL2 standard
by allocating additional spectrum for downstream data, dramatically improving
the data rate over ADSL2 or ADSL.

2

ADSL and IPTV Overview

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS

3

With its improved downstream rates, ADSL2+ is the preferred technology to
deliver IPTV. IPTV requires the installation of a set top box (STB) to decode the
compressed video stream for both broadcast and video-on-demand (VoD)
services. But transmitting IPTV streams through the network is far more
challenging than other broadband services. Broadband applications other than
IPTV (such as web browsing and file sharing) mainly use IP/TCP (Internet
protocol/transmission control protocol) with acknowledgment that sent packets
have been received and a retransmission, in case of lost packets. Unlike IP data
services, IPTV is a highly compressed, real-time application,and lost video packets
caused by intermittent problems with the transport or video stream can directly
be visible to the user in the form of pixelization, blurring, and frame freezes. In
addition, poor transaction quality (to receive program channels) and poor overall
content quality may also occur, further impacting the customer experience.

Video Qualit y Layers

Content Quality

Video Stream Quality

Transport Quality

Transaction Quality

Video QoS

Error Indicator Count

Continuity Error

PCR Jitter

PSI Table Data (Error)

RTP Packet Loss

RTP Packet Jitter

RTSP Latenc y (VOD)

IGMP Latency (BC-TV)

Video QoE Indicators

Picture: B lurring, Edge Distortion, Visual Noise
Audio: Lip Sync, Drop Outs

Pixelation, Tiling, Frame Freezes, Blue Screen

Service Accessibilit y, Channel Change Latency,
Pause, Play Latency, Service Latency