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.

ADSL and IPTV Overview

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS

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

+ 5 hidden pages