Md. Aminul Hassan
GM, Transmission, BTCL.
Dialup is simply the application of the Public Switched Telephone Network (PSTN) to carry data on behalf of the end user. Dial up networking technology provides PCs and other network devices access to a LAN or WAN via standard telephone lines. It involves a customer premises equipment (CPE) device sending the telephone switch a phone number to direct a connection to.
A dial-up connection can be initiated manually or automatically by personal computer's modem or other device. BTCL offers subscription plans for home computer users.
Types of dial up services include V.34 and V.90 modem as well as ISDN. Dial up systems utilize special-purpose network protocols like Point-to-Point Protocol (PPP).
The performance of dial up networking is relatively poor due to the limitations of traditional modem technology. V.90 modem dial up supports less than 56 Kbps Bandwidth and ISDN handles approximately 128Kbps. Many home users are currently replacing their dial up services with high-speed broadband technologies that operate at much higher speeds
ISDN is the abbreviation of integrated services digital network. It is international standard for sending Voice and Data over digital telephone on normal telephone wire.
There are two types of ISDN:
· Basic Rate Interface (BRI) -- consists of two 64-Kbps B-channel s and one D-channel for transmitting control information.
· Primary Rate Interface (PRI) -- consists of or 30 B-channels and one D-channel. The co-axial cable can be used in this case. Normally use E1 connectivity.
In both the services end-user can transfer voice and data (e.g. Video Conferencing) at end-to-end level. The protocol in the core is ISDN user part (ISUP) and DSS1 (Q.931) in the terminal side. The data packet can be transparently passed between/among the end users.
BTTB started the ISDN service both in Basic rate and primary rate. The service first inaugurated in May 2003 by the then Honorable Prime minister. Commercial service of Basic rate was started in Sept 2006 by providing service to GrameenPhone and Primary rate started in April 2009 to ADN. The vendor for the service was Nortel Netas at the beginning but now other vendor like Huawei also come up by providing PRI service.
Currently BTCL providing PRI services more than 30 different organizations including US, Canada, Sweden embassy.
Data was introduced in 2006, Telephone companies backed xDSL technology to provide next generation high bandwidth services to the home and business using the existing telephone cooper cabling infrastructure. xDSL Refers collectively to all types of digital subscriber lines, in which the two main categories: the Asymmetric DSL (ADSL) and the symmetric DSL (SDSL).
xDSL to the home over existing phone lines promises bandwidths up to theoretically 8.448 megabits per second and more, but distance limitations and line quality conditions can reduce the data rate. xDSL technologies uses a greater range of frequencies over the telephone cable than the traditional telephone services have used. This in turn allows for greater bandwidth with which to send and receive information, enabling for example continuous transmission of motion video, audio, and even 3-D effects.
xDSL utilizes more
At present BTCL is providing its end user with voice service as well as ADSL based internet service over its traditional copper wired network all over Bangladesh. As ADSL has huge limitations in terms of no. connections and data speed capacity, BTCL is introducing a latest technology, GPON in its network. GPON stands for Gigabit Passive Optical Networks. These short-haul network ( max. 20 km) of fiber-optical cable supports triple-play services of Internet access, voice over Internet protocol (VoIP), and digital TV delivery simultaneously. It can deliver 2.488 Gbits/s downstream and 1.244 Gbits/s upstream.
GPON cuts floor space and electricity usages in office building by as much as 95% compared to traditional copper networks, leading to the claim that GPON is a green technology.
GPON network is being laid down by BTCL through its two projects, RODTS (171KL) and TNDP. Already GPON/Triple play services are being used by the subscribers of Mirpur DOHS. RODTS(171KL) will install GPON network of 37,700 connections in Dhaka and TNDP will install a network of 1,01,940 connections in Dhaka and Chittagong metropolitan cities.
structure where network antenna or communication equipment placed.
LTE stands for Long Term Evolution.LTE provides high speed data connectivity through wireless media. Its optimal speed is 27.8 Mbps downlink. It’s a 4G technology which is ready to mitigate digital divide and reach the unreachable. To fulfill the digital Bangladesh goal of present Government BTCL has taken “Installation Wireless Broadband Network for Digital Bangladesh” project. The main components of this project are installation of core network at two different places in Dhaka, Installation of 670 at different District, Upazillas throughout the country including 7(Seven) Divisional Headquarters. Total cost of the project is 95684.24 Lac Taka in which Project aid from EDCF Korea is 61215.00 Lac taka(near about 65% of total cost) and GoB (F.E.) is 34469.24 Lac Taka. Project duration is from May 2014 to June 2017.