Fiber Monitoring Testing Transmission Wireless

Telebyte Broadband

The 458 Series -Local Loop Simulators

The 4901 Series XDSL Noise Interference Generators




Telebyte Broadband

About Telebyte Broadband

Headquartered in Hauppauge, New York, Telebyte, Inc. is a leading manufacturer of data communications equipment for copper and fiber networks. In addition, our high-tech enterprise offers local loop simulators and noise generators for testing broadband equipment. Telebyte supports a wide range of communication solutions and services including media converters, interface converters, short haul modems, and fiber optic products.

 The company’s main focus is the design, development, manufacturing, marketing and sales of technology products. It has two product lines: Data Communications and Broadband Test Equipment. These are used with both twisted-pair copper cable and fiber optic cable transmission media. They include fiber optic LAN extenders, fiber optic converters and modems, interface converters, short haul modems, isolation and surge protection devices, and others. The Broadband Test Equipment product line is focused on test equipment products (e.g., local loop simulators and noise generators) used in the development of signaling devices for technologies achieving broadband access to the Internet as well as the family of Digital Subscriber Line (DSL) signaling techniques.  

Local Loop Simulators

Model 458 Series (16-Slot Chassis)

The 458 Series 16-slot Chassis, which consists of the 458-CC chassis and one of three control modules, provides a wide variety of configurations through use of up to 16 plug-in line modules.

It is ideally suited for testing DSL modems and other bandwidth-compliant telecom devices in a high-volume production-line environment. It has the potential to house 128 channels when all slots contain our 8-channel line modules. In addition, the unit interfaces with a controlling PC or terminal via IEEE-488 or RS-232 to control loop-length settings. A user-friendly interface or user-command language may be used for control of the line modules.

The Model 458-CC Chassis is used with our advanced 458 Line Module series to simulate several cable types and offers the bandwidth requirements for today’s xDSL technologies such as ADSL, ADSL2, ADSL2+, VDSL and VDSL2.

Model 458 Multi-Channel Local Loop Simulator

Only need one, two or three slots? The Model 458-3SL accepts 1, 2 or 3 line modules (up to 8 channels each).

Accessories: 458 Line Modules

Model 458-3SL (3-Slot Chassis)


This compact, versatile unit accepts 1, 2 or 3 line modules and controls from 1 - 24 channels. The Telebyte Model 458-3SL is ideal for testing DSL modems and other bandwidth-compliant telecom devices in a high-volume production environment. While it can be used as a stand-alone unit, the built-in Control Module interfaces with a PC via RS-232, IEEE-488, or Ethernet. Line lengths and configuration settings appear on an LCD display on the front of the unit and can be set via a keypad. For added convenience, the Control Module firmware is field-upgradeable through the RS-232 port. The same software is used for the 458-CM (16-Slot chassis).

The Model 458-3SL is used with our advanced 458 Line Modules that simulate several cable types and offer the bandwidth requirements for today’s xDSL technologies such as varieties of ADSL, ADSL2+ and VDSL2. User-friendly GUIs (included with line modules) provide another means of controlling loop lengths and communication parameters.

Need more slots? The Model 458 Series 16-Slot Chassis accepts up to 16 line modules (up to 8 channels per line module).

Accessories: 458 Line Modules

Model 458  Line Module Series

  • Wide variety of technologies, including ADSL, ADSL2+, VDSL & VDSL2
  • Bandwidths to 36 MHz
  • Plug into our 458-3SL(3-Slot Chassis) or 458 Series (16-Slot chassis)
  • Include User-Friendly GUIs
  • Multiple Configurations - from 2 to 8 channels
  • Low Noise Floor / Low Crosstalk
  • One-Year Warranty/Calibration. See Customer Care Program for details.

All of our reliable 458 Line Modules can be plugged into our Model 458 Series (16-Slot) or 458-3SL (3-Slot) chassis to create a wide variety of configurations. The use of high-precision inductors, resistors and capacitors facilitates full bi-directional operation at all specified frequencies. Bandwidths to 36 MHz accommodate the latest technologies.

The 458 Line Module Series in Bandwidth Order

Line Module Ch Technology Cable Lengths/Increments Bandwidth
458-LM-20 n/a ADSL, ADSL2, ISDN 26 AWG PIC 0-20.5 kft/500 ft DC to 1.5 MHz
458-LM-E20 n/a ADSL, ADSL2, ISDN 0.4 mm PE 0-6.15 km/150 m DC to 1.5 MHz
458-LM-HDJ 8 ADSL, ADSL2, ADSL2+ 0.4 mm Paper 0 km to 7.5 km/500-m DC to 4.0 MHz
458-LM-HD 8 ADSL, ADSL2, ADSL2+ 26 AWG PIC Channel 1: 0 - 31,750 ft/250 ft
Channel 2-8: 0-30,000 ft/2,000 ft
DC to 4.5 MHz
458-LM-HDE 8 ADSL, ADSL2, ADSL2+ 0.4 mm PE Channel 1: 0 - 9,450/150 m
Channel 2-8: 0-9,000/600 m
DC to 4.5 MHz
458-LM-A2-18 2 ADSL, ADSL2, ADSL2+, VDSL, VDSL2 (supports up to Profile 17a) 24/26 AWG 0-16,000 ft/100 ft DC to 18 MHz
458-LM-A8-18 8 ADSL, ADSL2, ADSL2+, VDSL, VDSL2 (supports up to Profile 17a) 26 AWG PIC 0-15,000 ft/1,000 ft DC to 18 MHz
458-LM-E2-18 2 ADSL, ADSL2, ADSL2+, VDSL, VDSL2(supports up to Profile 17a) 0.4/0.5 mm PE 0-8,000 m/50 m DC to 18 MHz
458-LM-A2-36 2 ADSL, ADSL2, ADSL2+, VDSL, VDSL2 24/26 AWG 0-3,150 ft /50 ft DC to 36 MHz
458-LM-A8-36 8 ADSL, ADSL2, ADSL2+, VDSL, VDSL2 26 AWG PIC 0-7,500 ft /500 ft DC to 36 MHz
458-LM-E2-36 2 ADSL, ADSL2+, VDSL2 0.4/0.5 mm PE 0-1,575 m/25 m DC to 36 MHz

Model 4901 Multi Output Universal xDSL Noise/Interference Simulator


The Telebyte Model 4901 Multi-Output Noise Simulator provides 2 to 24* independent noise channels in a convenient, 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. No additional PC required.  

  • 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

  • Split output from 1 AWGx port to 2 noise injectors, expanding ports to total of 48 Ports

  • Combine Crosstalk and Impulse on one test loop

  • 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

  • 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

  • Loop Configuration Editor provides segment design/displays resulting loop attenuation

  • Integrate with Telebyte WLS to control wire type and length

  • Save custom noise files or entire configurations to repeat tests with ease and accuracy

  • Import MATLAB (.mat) or Excel (.xls) noise files

  • Remote control via RS-232, multiple Telnet sessions over Ethernet

  • Adjust Amplitude of Crosstalk or Impulse noise

  • Timed noise playback


Visit the Telebyte Broadband website for further detailed information on the 4901







Model 4901 XDSL Noise Simulator





Model 4901 XDSL Noise Simulator





CKEY Networks - Converging Key Communications Networking Products and Testing Equipment. Please call us for more information today 613-257-8863