Fiber Optic Transmission Lines → FOTL - Tutorial 011. The operating principle of OTDR

волс, fiber, OTDR, рефлектометр

Pulse reflectometers OTDR (Optical Time Domain Reflectometer) operate on a similar principle, which is used in reflectometers for testing electrical cables. Reflectometer submits a powerful light pulse into the optical fiber ), as well as an electrical reflectometer submits powerful …

Data Transmission Technologies → Token Ring and FDDI technologies

FDDI, токен, Token Ring

Token Ring and FDDI technologies have significantly more complex implementation than the same Ethernet technology on a shared data environment. Much of this complexity was due to the fact that the developers have tried to improve the effectiveness of the …

Data Transmission Technologies → Features of the SDH line of microwave systems

STM-RR, SDH, радиорелейная система, РРЛ

SDH technology is not limited to use as a transmission medium, only the fiber-optic cable (FOC) . Also, widespread use of radio for the organization of radio relay line SDH networks. Relay channels have great promise for replacing relay RDN …

Data Transmission Technologies → Сети OTN - Optical Transport Network

dwdm, OTN, стек протоколов

DWDM networks are not initially digital networks because they provide users with only a few spectral channels, which are only data transmission medium. Also originally DWDM multiplexers perform SDH multiplexer functionality, in consequence of which inherited a number of shortcomings …

Fiber Optic Transmission Lines → FOTL - Tutorial 010. Measurement of losses by optical testers

fiber, волс, измерения, оптический тестер

There are two methods of measuring the loss in the optical fibers which, in accordance with G. 651 and G. 652, is considered the reference - fiber breakup method and the method of insertion loss. The loss measurements are made …

Data Transmission Technologies → DELL Networking. Basics Routing Policy (Part 3)

DELL, Route-Map

VLAN Traffic Redirection

Passing traffic without PBR Example. Comparison of packets from one VLAN, then routing the output of another VLAN to their destination.

Remote server X, Y, Z hourly cached on the local server A, B, C. Members VLAN …

Qt → Qt/C++ - Lesson 016. How to set QCheckBox in the cell center in QTableWidget?

qcheckbox, qcheckbox center, Qt, QTableWidget

One of the first problems in working with The QTableWidget , which are trying to solve, start to work with this widget - setting QCheckBox in the middle of the cell. The fact that the standard check box in QTableWidget …

Qt → Qt/C++ - Lesson 015. QTableWidget – How to create a table with checkboxes?

Qt Таблица, QTableWidget example, QTableWidget пример, Qt, QTableWidget

Using QTableWidget will be the first in a manner that will advise you to create tables with checkboxes on Qt. So let's look at this option and work with tables in Qt and certainly applicable checkboxes.

So, the lesson to …

Data Transmission Technologies → Ethernet over SDH

NG SDH, LCAS, Ethernet, GFP, SDH, VCAT

Ethernet and SDH technologies are focused on computer and information networks. But the main problem in their interaction is pairing constant fixed speed SDH channels with pulsating Ethernet traffic. For example, VC-4 has a speed of 149.760 Mb / s, …

Data Transmission Technologies → DELL Networking. Basics Routing Policy (Part 2)

DELL, Route-Map

Server Priority

DELL Networking - Server Priority In this example, the database server should be provided more bandwidth at a specific time to access the storage server.

Configuring VLAN interface on 1G

console#config 
console(config)#vlan 10 
console(config-vlan10)#exit 
console(config)#interface vlan 10 
console(config-if-vlan10)#ip …