Month: May 2013

FiberStore has announced the release of a high performance handheld ADSL2+ tester, model, FS801C, which is an easy-to-use, multifunction telecommunication tester for technicians that work for the installation, maintenance and measurement of ADS2+ service. Our FS801C ADSL2+ tester proides digital multi-meter testing capabilities such as loop resistance, capacitance, insulationresistance and voltage. The FS801C not only can test the ADSL2 + / ADSL link management layer parameters but also can alarm analysis of the parameters. This handled telecommunication tester offers physical layer parameter testing including rate, attenuation, noise margin and output power. Its testing functions including parameter, error, DMM, PING that related to ADSL2+ service and features auto power off and back-light time out. To make sure you will know better about this ADSL2+ tester from us. Let’s review what is ASDL, ADSL2, and ADSL2+ first.

ADSL (Asymmetric Digital Subscriber Line, Asymmetric Digital Subscriber Loop) is a new data transmission. It is named because the upstream and downstream bandwidth is asymmetric. It uses frequency division multiplexing technology to divide the ordinary telephone line into three independent channels which is the phone, upstream and downstream thus avoiding mutual interference. This makes the true that if when you are talking on the phone while surfing the internet, it will not happen speed Internet speed Internet access and voice quality decline. Generally, ADSL can provide up to 3.5Mbps of upstream speeds and downstream speed up to 24Mbps. ADSL2 is the next generation of ADSL, the new standard (G.992.3 and G.992.4) announced by ITU-T. ADSL2’s data rate, coverage range are better than the ASDS. The maximum downstream link of ADSL2 reach up to 12Mbit/s, and upstream rate up to 1 Mbit / s.

By reducing the overhead of frame, ADSL2 improve the performance of the initialization state machine, implement with a more efficient modulation method, a higher coding gain and enhancement of the signal processing algorithms. ADSL2 + Transmitter enhanced diagnostic tools, these tools provide a means to solve the problem in the installation phase, the service phase of monitoring instruments and tools update.

ADSL2+ Tester FS801C Features:
Full support all ADSL standards, which includes ANSI T1.413 Issue 2, ITU-T G. 992.1(G. Dmt), ITU-T G. 992.2 (G. Lite), ITU-T G. 992.3(ADSL2), RE-ADSL2 and ITU-T G. 992.5(ADSL2+)
Automatically fit for the ADSL line standards, real-time display ADSL line connection status
Support both WAN PING and LAN PING
Support replacing MODEM and simulating the whole process of login on Internet
High resolution backlight large LCD, Handheld design and easy-to-use
Built-in Li rechargeable battery and smart charger circuit.
High storages capacity, can store up to 70 groups of test results including settings and results information.
Various Voice alarm and LED indications
Upgradeable software via an integrated RS-232 interface
Test results uploaded, conserved and printed by PCManager Software
The ADSL Tester supports the testing function such as parameter, error, DMM, PING that related to ADSL2+ service, it can directly enables the engineers to verify, troubleshoot and evaluate the ADSL2+ service. Other related test tools like telephone line tester are also available at FiberStore. For all our products of this kind, we provide one year warranty for that. FiberStore is an international leading provider of fiber optic communication test instruments, equipment for the installation, testing and maintenance of communications infrastructures. For sales inquiry please visit FiberStore.com or send emails to sales@fiberstore.com.

As the wide application of fiber optic system, optical light source plays a more and more important part in it. We known a basic optical fiber system consists of a transmitter, an optical fiber and a receiver. The fiber optic light source, as an important component of the transmitter is modulated by a suitable drive circuit in accordance with the signals to be transmitted. Optical light source are also needed for performing fiber optic network testing to measure the fiber optic loss in the cable plant. Light source are offered in a variety of types including LED, halogen and laser. Among which, LED and Laser light source are two types of semiconductor light sources. The following article will discuss about some differences between laser and Led light source.

Basically, both kind of light source must be able to turn on and off millions to billons of times per second while projecting a near microscopic beam of light into an optical fiber. During the working process of optical signals, they are both supposed to be switched on and off rapidly and accurately enough to properly transmit the signals.

General difference between them as that LEDS is the standard light source which is short for light-emitting diodes. Laser light source like gas lasers may be mainly used in some special cases. Lasers are more powerful and operate at faster speeds than LEDs, and they can also transmit light farther with fewer errors. Laser are also much more expensive than LEDs.

LED fiber optic light source are made of materials that influence the wavelengths of light that are emitted. A basic LED light source is a semiconductor diode with a p region and an n region. When the LED is forward biased, current flows through the LED. As current flows through the LED, the junction where the p and n regions meet emits random photons. LEDs emitting in the window of 820 to 870 nm are usually gallium aluminum arsenide (GaAIAs). Laser is also a semiconductor diode with a p and an n region like LED, but it provide stimulated emission rather than the simplex spontaneous emission of LEDs. The main difference between a LED and a laser is that the laser has an optical cavity required for lasting. The cavity is formed by cleaving the opposite end of the chip to form highly parallel, reflective, mirror like finishes.

VCSEL is a popular laser source for high speed networking, which consist of two oppositely oppositely-doped Distributed Bragg Reflectors (DBR) with a cavity layer. It combines high bandwidth with low cost and is an ideal choice for the gigabit networking options.

Different wavelengths travel through a fiber at different velocities as a result of material dispersion. What should always keep in mind is that both Laser and LED will not emit a single wavelength, but a range of wavelength that is known as the spectral width of the source. Fiber optic light source is always works with the fiber optic power meter. During the working process, it collimated beams of light and aim right down the center of the narrow single mode core and propagates in essentially a single mode transmission. By more questions about fiber optic test equipment, such as visual fault locators, optical power meter, OTDR testers, and more. please go for FiberStore webstore.

As we get from Wikipedia, a punch down tool refer to a small hand tool used to inset wires into IDC (insulation-displacement connectors) of the punch down blocks, typical 110 block, patch panels, keystone modules, or other surface mount boxes. It is also called Krone tool. By using the Krone punchdown tool, technician that work for telecommunication and network can maker a faster, more uniform conections in the Krone wiring blocks with less effort.
Punch down tools are impact sized, and consist of a handle, an internal spring mechanism, and a removable slotted blade. To use the punch down tool, position the wires into a slotted post, press the punch down tool on the top of the wire, with a single push, the spring loaded mechanism will trigger the blade at just the right point to seat, cutting the insulation and securing the wire. There are ON/OFF selector for you to turn on or off the cutting function.

Krone tool is named after the Krone LSA PLUS connector, Krone LSA PLUS is an IDC (insulation-displacement connectors) for telecommunications, which is alternative to 110 block in European. Compared to 110, krone can be easily identified by its contact slots arranged at a 45 degree angle to the wire. FiberStore Krone-LSA-PLUS Insertion/Punch Down Tool is right a highly reliable and cost connection solution for today’s telecommunication and data networks, the design of which use our unique Insulation Displacement Contact (IDC) technique that can clamps the wires at a 45° angle, and greatly removing the chances of a poor termination and increasing the wiring productivity. Our LSA PLUS Krone tool is perfect for applications in telecommunication, broadcast system, and audio connections and their associated control systems.

Product Key Features:
Combined the impacted punch down and torque tool function
Build-in screwdriver & wire- pull function
The LSA-Plus insertion tool with sensor is the key to unparalleled contact reliability and guarantees fast and clean working.
Simply applying pressure with the tool enables the wire to be trimmed and connected in a gas-tight connection in a single action.

The Krone-LSA-PLUS punch down tool (above picture shows) is consist of a contact slot with flexible contact arms. There are arranged at 45° to the axis of the wire. Polishing contacts at a 45° angle leaves more wire between contact points and provides a more reliable, stress-resistant connection, which is superior to the other contacts that contacts at 90° angle produces a point of weakness subject to breakage. The wire (4) is pressed by the Insertion Tool (5) into the contact slot (2) cutting through the conductor insulation. By displacing ribs tightly grip the wire on both sides of the contact, ensuring the mechanical integrity of the connection. In a simple movement the Intertion tool will terminates the wire and cropping it to the desired length.

FiberStore is a one of the main online supplier of series of optical telecommunication and network products, including fiber optic cables, fiber optic transceiver, optical testers as well as various of fiber optic tools. Click and know more details about our Krone Punchdown tools.

Source: FiberStore Blog, Click to see.

PON ( Passive Optical Network) refers to the optical distribution network does not contain any electronic device and electronic power, optical distribution network (ODN) all by the optical splitter and other passive components, without the need for expensive electronic equipment, is a form of fiber-optic access network. PON reduces the amount of fiber and central office equipment required compared with point-to-point architectures.

A PON consists of an optical line terminal (OLT) at the service provider’s central office and a number of optical network units (ONUs) near end users. In OLT/ONU between the optical distribution network includes optical fiber and passive optical splitter or Fiber Optic Coupler.

OLT
An OLT, generally an Ethernet switch, router, or multimedia conversion platform, is located at the central office (CO) as a core device of the whole EPON system to provide core data and video-to-telephone network interfaces for EPON and the service provider.

ONU
ONUs are used to connect the customer premise equipment, such as PCs, set-top boxes (STBs), and switches. Generally placed at customer’s home, corridors, or roadsides, ONUs are mainly responsible for forwarding uplink data sent by customer premise equipment (from ONU to OLT) and selectively receiving downlink broadcasts forwarded by OLTs (from OLT to ONU).

ODN
An ODN consists of optical fibers, one or more passive optical splitters (POSs), and other passive optical components. ODNs provide optical signal transmission paths between OLTs and ONUs. A POS can couple uplink data into a single piece of fiber and distribute downlink data to respective ONUs.

There are two passive optical network technologies: Ethernet PON (EPON) and gigabit PON (GPON). EPON and GPON are applied in different situations, and each offers its own advantages in subscriber access networks. EPON focuses on FTTH applications while GPON focuses on full service support, including both new services and existing traditional services such as ATM and TDM.

EPON is a Passive Optical Network which carries Ethernet frames encapsulated in 802.3 standards. It is a combination of the Ethernet technology and the PON technology in compliance with the IEEE 802.3ah standards issued in June, 2004. A typical EPON system consists of three components: EPON OLT, EPON ONU and EPON ODN. It has many advantages, such as lower operation and maintenance costs, long distances and higher bandwidths.

GPON utilizes point-to-multipoint topology. GPON standard differs from other PON standards in that it achieves higher bandwidth and higher efficiency using larger, variable-length packets. And GPON is generally considered the strongest candidate for widespread deployments. GPON has a downstream capacity of 2.488 Gb/s and an upstream capacity of 1.244 Gbp/s that is shared among users.

There are also many differences between EPON and GPON. EPON, based on Ethernet technology, is compliant with the IEEE 802.3ah Ethernet in the First Mile standard that is now merged into the IEEE Standard 802.3-2005. It is a solution for the “first mile” optical access network. GPON, on the other hand, is an important approach to enable full service access network. Its requirements were set force by the Full Service Access Network (FASN) group, which was later adopted by ITU-T as the G.984.x standards–an addition to ITU-T recommendation, G.983, which details broadband PON (BPON).

Both EPON and GPON are accepted as international standards. They cover the same network topology methods and FTTx applications, incorporate the same WDM technology, delivering the same wavelength both upstream and downstream together with a third party wavelength. PON technology provides triple-play, Internet Protocol TV (IPTV) and cable TV (CATV) video services.