Telebyte 4901 User manual

“Results You Can Count On”
Reference Manual
Model 4901
Multi-Output Noise Simulator
v 1.0
Rev –
Date of Publication: 03/01/08

Model 4901 Multi-Output Noise Simulator 1.0 Rev - TOC 1
Table of Contents
1.0 Introduction................................................................................................................................................................1
1.1 The Model 4901 Multi-Output Noise Simulator...................................................................................................1
1.2 Main Features........................................................................................................................................................1
1.3 Specifications.........................................................................................................................................................2
1.3.1 Model 4901 Specifications................................................................................................................................2
1.3.2 Model 4901-D1 Differential Mode Noise Injector Specifications....................................................................2
2.0 Before You Begin......................................................................................................................................................3
2.1 Included with Your System...................................................................................................................................3
2.1.1 Software ............................................................................................................................................................3
2.1.2 Hardware...........................................................................................................................................................4
2.2 Provided by Customer ...........................................................................................................................................4
3.0 Connectors/Indicators/Switches.................................................................................................................................5
3.1 Front & Rear Views...............................................................................................................................................5
3.1.1 Front View ........................................................................................................................................................5
3.1.2 Rear View & Connections.................................................................................................................................6
3.2 Sample Test Configuration Diagram.....................................................................................................................7
4.0 Making Connections..................................................................................................................................................8
4.1 4901-D1 Standalone..............................................................................................................................................8
4.1.1 4901-D1 to WLS Using RJ-45 to RJ-45 Cable.................................................................................................8
4.1.2 4901-D1 to 4901-AWG card Using SMB-to-SMB Cable ................................................................................9
4.1.3 4901-D1 Power Connections ..........................................................................................................................10
4.2 4901-RM-D1 Rack Mount Assembly and Connections (Optional) ....................................................................11
4.2.1 Overview.........................................................................................................................................................11
4.2.2 4901-RM-D1 Assembly..................................................................................................................................11
5.0 Using the 4901-NS Software ...................................................................................................................................13
5.1 Launching the 4901-NS Noise Generator Application Software ........................................................................13
5.2 Elements of the Main Screen...............................................................................................................................14
5.2.1 Menu Bar.........................................................................................................................................................14
5.2.1.1 Noise Control Icons – Menu Bar............................................................................................................14
5.2.1.2 Saving Files and Configurations – Menu Bar.........................................................................................14
5.2.1.3 Remote Control Configuration...............................................................................................................14
5.2.2 Noise Type Selections.....................................................................................................................................14
5.2.3 Noise Configuration Section...........................................................................................................................15
5.2.3.1 Default Custom Crosstalk Screen...........................................................................................................16
5.2.3.2 Default User Crosstalk Screen................................................................................................................17
5.2.3.3 Default Custom Impulse Screen.............................................................................................................18
5.2.3.4 Default User-Defined Impulse Screen....................................................................................................19
5.3 General Instructions.............................................................................................................................................20
5.4 Configure 4901-AWGx Card ..............................................................................................................................20
5.5 Control Noises.....................................................................................................................................................21
5.5.1 Save/Import Current Noise..............................................................................................................................22
5.5.2 Load/Play/Stop Noise......................................................................................................................................22
5.5.3 Adjust Amplitude............................................................................................................................................23
5.5.4 Set Noise Playback Time ................................................................................................................................23
5.6 Noise Type Modes...............................................................................................................................................24

Model 4901 Multi-Output Noise Simulator 1.0 Rev - TOC 2
5.6.1 Custom Crosstalk ............................................................................................................................................24
5.6.1.1 Section: Custom Crosstalk Configuration..............................................................................................24
5.6.1.1.1 For All Standards ..............................................................................................................................24
5.6.1.1.2 VDSL2 Selections (includes VDSL1)...............................................................................................25
5.6.1.1.3 ADSL (includes ADSL2/ADSL2+) ..................................................................................................25
5.6.1.1.4 SHDSL..............................................................................................................................................25
5.6.1.1.5 ISDN .................................................................................................................................................25
5.6.1.1.6 HDSL ................................................................................................................................................25
5.6.1.1.7 T1 ......................................................................................................................................................26
5.6.1.1.8 Pre-Defined Spectrum.......................................................................................................................26
5.6.1.2 Section: RFI Configuration ....................................................................................................................26
5.6.1.3 Section: Loop Configuration..................................................................................................................26
5.6.1.3.1 Loop ..................................................................................................................................................27
5.6.1.3.2 WLS Communication Settings..........................................................................................................27
5.6.1.3.3 Update All WLS Settings..................................................................................................................28
5.6.1.4 Section: Noise Injection Parameters.......................................................................................................28
5.6.1.4.1 Noise Injector....................................................................................................................................28
5.6.1.4.2 Insertion Loss....................................................................................................................................28
5.6.1.4.3 Line Impedance.................................................................................................................................29
5.6.1.5 Section: PSD graphic..............................................................................................................................29
5.6.1.5.1 Save/Copy/Print ................................................................................................................................30
5.6.1.5.2 View Options.....................................................................................................................................30
5.6.2 User Crosstalk.................................................................................................................................................31
5.6.2.1 Section: User-Defined Crosstalk ............................................................................................................31
5.6.2.1.1 Import Data .......................................................................................................................................31
5.6.2.2 Section: RFI Configuration ....................................................................................................................31
5.6.2.3 Loop Configuration ................................................................................................................................31
5.6.2.4 Noise Injection Parameters.....................................................................................................................31
5.6.3 Special (Crosstalk) ..........................................................................................................................................31
5.6.4 Custom Impulse Mode....................................................................................................................................32
5.6.4.1 REIN Options.........................................................................................................................................32
5.6.4.2 SHINE Options.......................................................................................................................................33
5.6.4.3 ICE Options............................................................................................................................................33
5.6.4.4 Loop Configuration ................................................................................................................................34
5.6.4.5 Noise Injection Parameters.....................................................................................................................34
5.6.4.6 PSD graphic............................................................................................................................................34
5.6.5 User Impulse Mode.........................................................................................................................................34
5.6.5.1 Loop Configuration ................................................................................................................................34
5.6.5.2 Noise Injection Parameters.....................................................................................................................35
5.6.6 Special (Impulse).............................................................................................................................................35
6.0 Remote Control........................................................................................................................................................35
6.1.1 Connecting via RS-232 ...................................................................................................................................35
6.1.2 RS-232 Remote Commands............................................................................................................................37
Appendix A – Sample Configurations..................................................................................................................................38
6.2 AWGN.................................................................................................................................................................38
6.3 24 VDSL2 NEXT & FEXT.................................................................................................................................39
6.4 12 VDSL2 + 12 ADSL2 NEXT + FEXT ............................................................................................................40
6.5 12 VDSL2 + 6SHDSL @2.3 MBPS NEXT & FEXT.........................................................................................41

Model 4901 Multi-Output Noise Simulator 1.0 Rev - TOC 3
6.6 REIN....................................................................................................................................................................42
7.0 Appendix B – Expansion Options & Instructions....................................................................................................43
7.1 Ordering Options.................................................................................................................................................43
7.2 Installing/Moving 4901-AWG Cards..................................................................................................................43
7.2.1 Step-by-Step Instructions................................................................................................................................43
8.0 Technical Support....................................................................................................................................................46

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 1 of 46
1.0 Introduction
1.1 The Model 4901 Multi-Output Noise Simulator
The Telebyte Model 4901 Multi-Output Noise Simulator provides 2 to 24 independent noise channels in a 4U-high unit.
The system holds up to 6 AWG cards, each of which can be configured with either 2 or 4 channels. This powerful solution
is easily expanded by adding more 2 or 4-port AWG cards and companion noise injectors. The system includes user-
friendly configuration software allowing the user to select and build a wide variety of impairment models common to
DSL network implementations. Common crosstalk types available include ADSL2+, VDSL2 and many more. The user-
defined crosstalk feature allows specification of a target PSD on the DSL line. Using either MATLAB (.mat) or Excel
(.xls) files, the user supplies the target PSD in dBm/Hz and corresponding frequency values. This feature produces
crosstalk with the desired PSD on the DSL line and, optionally, any combination of RFI tones. Impulse noises such as
REIN, SHINE and ICE are also included. No additional PC required.
1.2 Main Features
•Bandwidth 20 kHz to 30 MHz
•Crest Factor greater than 5
•Noise Floor less than -145 dBm/Hz (as measured at the output of the noise injector)
•Expand system as needed
•Add up to 6 AWG cards (2-Port and/or 4-Port) for a maximum of 24 Ports
•Employ up to 48 noise injectors using “Y” cables to split output from 1 AWGx port to 2 noise injectors
•Create a wide variety of noise combinations
•High degree of accuracy
•Independent control of each port
•Select from common crosstalk types such as ISDN, HDSL, T1, ADSL, G.SHDSL bis, SHDSL and VDSL
•Impulse noises such as REIN and SHINE
•North American and European units of measure
•Specify NEXT, FEXT and number of disturbers
•Add in RFI and AWGN (at variable levels)
•Specify impedance, sampling rate and DUT location
•Graphical representation of noise PSD
•Integrate with Telebyte WLS
•Save custom noise files to repeat tests with ease and accuracy
•User-Defined Crosstalk Feature using MATLAB (.mat) or Excel (.xls) files
•Calibration through specification of injector insertion loss
•Remote control via RS-232
•Adjust Amplitude of Crosstalk or Impulse noise
•Timed noise playback

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 2 of 46
1.3 Specifications
1.3.1 Model 4901 Specifications
Multi-Output Noise Simulator Specifications**
Bandwidth AWGN: 20 kHz to 30 MHz
Interference Profile Accuracy ≤0.5 dB mean absolute error (MAE) for all Power Spectral Densities of
Crosstalks
AWGN Crest Factor ≥5
AWGN Gap < 10%
Output Impedance 50Ωunbalanced
Dynamic Range 95dB(-90 dBm to +5 dBm)
Remote Commands RS-232
Included Software Telebyte Multi-Output Noise Simulator Software
Power supply AC 90 V to 264 V, 47 to 63 Hz
Operating Temperature
Range 0 to 50 º C
Storage and Transport -20 to 70 º C
Operating Relative Humidity Maximum 80% for up to 31° C, decreasing linearly to 50% at 40°C
Mechanical Dimensions 4U-High Rack-Mountable Chassis
¾The generation of Crosstalk/RFI noises and Impulse noises must be carried out on different cards.
1.3.2 Model 4901-D1 Differential Mode Noise Injector Specifications
Bandwidth 20 kHz to 30 MHz
Output Impedance 4kΩMinimum (20 kHz to 30 MHz)
Input Impedance 50Ωunbalanced (100Ωunbalanced*)
Output Mode Differential, balanced
Noise Floor Below –145 dBm/Hz as measured at the output of the noise injector
Power Loss (IL) 13 dB/35 dB ± 0.5 dB
Connectors SMB Female Connector for 4901 Multi-Output Noise Simulator, RJ45 (2) Female
Connectors for Loop Simulator (external cable provided) and for the modem.
Operating Temperature Range 0 to 50 º C
Operating Relative Humidity Maximum 80% for up to 31° C, decreasing linearly to 50% at 40°C
Mechanical Dimensions 2.6” W x 1.4” H x 4.7” D
Power supply AC 90 V to 264 V, 47 to 63 Hz, 10 W
* 100Ωinput used when two noise injectors are combined by a “Y” cable to form a common input

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 3 of 46
2.0 Before You Begin
2.1 Included with Your System
2.1.1 Software
The Model 4901 ships with the Windows XP operating system and 4901-NS Noise Generator Software installed.
Additional noise modules may be purchased separately.
Standards and Protocols Included in Base System
Standard Protocols Mode Mask Rate
ADSL,
ADSL2,
ADSL2+
G.992.1 Annex A, B
G.992.2 Annex A
G.992.3 Annex A, B, I, J,
L, M
G.992.4 Annex A, I
G.992.5 Annex A, B, I, J,
M
EC
FDM Upstream: G.992.3 Annex J (1-9)
G.992.3 Annex L (1-2)
G.992.3 Annex M (1-9)
G.992.5 Annex J (1-9)
G.992.5 Annex M (1-9)
G.SHDSL
bis
HDSL
ISDN
SHDSL G.991.2 Annex A
G.991.2 Annex B
PSD:
Symmetric
Asymmetric
Annex A or B/Symmetric: 256,
512, 768, 1024, 1280, 1536,
2048, 2304 kbps
Annex B/Asymmetric: 768,
1536 kbps
Annex B/Asymmetric: 2048,
2304 kbps
T1
VDSL2 G.993.2 Annex A
G.993.2 Annex B
G.993.2 Annex C
Operating:
POTS All-digital G.993.2 Annex A (mask 1-9) G.993.2 Annex B (mask 1-10)
ETSI A
ETSI B
Euro-K
Impulse Noise Included in Base System
REIN
SHINE
ICE

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 4 of 46
2.1.2 Hardware
The Model 4901 ships with the 4901-AWG cards purchased and all necessary drivers installed.
•4901-PC Telebyte Industrial Computer
•Metal rack-mount handles for 4901-PC
•4901-NS Noise Generator Software installed at factory
•At least (1) 4901-AWG2 (2-Port AWG Card) or 4901-AWG4 (4-Port AWG Card), installed at factory.
•At least (1) 4901-D1 Differential Mode Noise Injector.
•At least (1) Power supply for each set of (1-4) 4901-D1’s.
•Cables
o(1) SMB-to-SMB cable and (1) RJ-45 to RJ-45 cable for each 4901-D1 purchased. These may vary in
length, depending on the configuration of your system.
o(1) Power cable for 4901.
o(1) Power Daisy-Chaining cable for each 4901-D1 purchased.
oIf purchased, at least (1) 4901-YC “Y” cable for splitting noise from (1) 4901-AWGx port to (2)
4901-D1’s.
•If purchased, (1) 4901-RM-D1 Rack Mount - holds up to (4) 4901-D1’s and (1) power supply.
2.2 Provided by Customer
•USB Keyboard
•USB Mouse
•Monitor and monitor cable. Monitor must be capable of displaying at a resolution of at least 1440 x 900.

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 5 of 46
3.0 Connectors/Indicators/Switches
3.1 Front & Rear Views
3.1.1 Front View
Figure 1: 4901-Front view, shown with cover open.

Model 4901 Multi-Output Noise Simulator 1.0 Rev - Page 6 of 46
3.1.2 Rear View & Connections
Figure 2: 4901-Rear View showing 4901-AWGx cards as well as serial, Ethernet, USB and monitor connectors.
Figure 3: Illustration of channel designations on a 4901-AWG4 card.
¾The number of 4901-AWGx Cards installed depends upon your configuration.