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In the name of Allah, - PowerPoint Presenation


2. By : Lecturer Telecom. Staff College Haripur.. . Muhammad Pervez. Digital Cross Connect (DXX). Introduction to. 3. DXX SYSTEM. Bandwidth Manager. DXX node can be described as a digital MUX equipped with several Trunks and Access interfaces. Often referred to as a flexible multiplexer or

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In the name of Allah,

the Most Gracious, the Most Merciful


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Introduction to

By : Lecturer

Telecom. Staff College Haripur.

Digital Cross Connect (DXX)

Muhammad Pervez


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DXX SYSTEM

  • Bandwidth Manager.

  • DXX node can be described as a digital MUX equipped with several Trunks and Access interfaces.

  • Often referred to as a flexible multiplexer or “Flex Mux", reflecting the flexible implementation of different interface connections.


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DXX SYSTEM

  • The DXX can cross-connect any E1 line in the system with any other E1 line in the system

  • Provides cross connections from timeslot level to bit level


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DXX System (Contd.)

  • Enables the provision of lower/sub rate traffic as compared to other media e.g., from Digital Exchanges we can provide only Analog voice,

    BRI (2B+D) i.e 128Kbps and PRI (30B+D).

  • Can provide a variety of data and speech bands sub and Super-rate multiplexing up to 2Mb/s

  • Supports all modern technologies e.g, ATM, FR & ISDN.


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  • Dial Up.

  • ISDN.

  • Local Area Net Work (LAN / WAN).

  • Digital Cross Connect (DXX).

  • Digital Subscriber Line (xDSL).

  • Optical Fiber Access Network (OFAN).

Data Transmission Medias.


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  • A component in Windows 95 and Windows 98 that enables you to connect your computer to a network via a “modem”.

  • If your computer is not connected to a LAN, and you want to connect to the Internet, you need to configure Dial-Up Networking (DUN) to dial a Point of Presence (POP) and log into the Internet Service Provider (ISP). ISP will need to provide certain information, such as the gateway address and your computer's IP address. (Now it is supported automatically)

  • You access (DUN) through the My Computer icon. Different profiles (called a connectiod) for different online services can be configured. Once configured, a connectiod shortcut can be copied to a desktop. By double-clicking the connectiod icon, a connection can be established.

Dial Up.


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  • The Integrated Services Digital Network (ISDN) is a set of international standards for access to advanced, all-digital public telecommunications networks. The key elements of this definition are:

  • Integrated Services:

  • Digital:

  • Network:

ISDN.


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Integrated Services

  • Voice.

  • Video.

  • Image.

  • Data.

  • Mixed media at a number of standard

  • data rates


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Digital

  • Digital terminal equipment.

  • Digital local loops.

  • Digital trunks.

  • Digital switching.

  • Digital signaling.


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Network

Worldwide, interoperating communications fabric under distributed control using common standards.

ISDN standards have been defined by the ITU-T , a branch of the United Nations' International Telecommunications Union (ITU), in the series “I” and “Q” recommendations.


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  • Basic RateAccess (2B+D)

  • It contains two Bearer (B) channels 64 Kbps and one signaling channel (D) 16 Kbps.

  • So that a total bit rate of 144 Kbps is available on a single twisted copper pair.

  • Bearer channels are basically for voice or Data and “D” channel Is for signaling.

ISDN (BRI).


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  • Primary rate Access (30B + D)

  • For Broad band services

  • It contains thirty Bearer (B) channels 2 Mbps and one signaling channel (D) 64 Kbps.

ISDN (PRI).


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Key Features of DXX

The DXX provides a complete networking solution to the network operators with the following benefits:

  • Efficient utilization of existing transmission bandwidth.

  • Powerful NMS to manage large networks.

  • The best flexibility for networking.

  • Manageability.

  • Expandability.

  • Higher service quality and hence higher customer satisfaction.


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Key Features of DXX

DXX (Digital)

Super rate :

-Multiplexing of = > 64 K bits / Sec.

Sub-rate :

-Multiplexing of < 64 K bits / Sec.


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DXX APPLICATIONS

Most typical DXX applications are:–

  • Data applications.

  • Voice applications.


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DXX DATA APPLICATIONS

Data Applications include:-

  • Leased line data circuits.

  • LAN – LAN interconnection.

  • Point to Point data.

  • Point to multipoint data.

  • Paging Systems.


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PTCL NETWORK

CPE

Point to Network

DXX Node

E-1

The customer owns or leases the Equipment and subscribes to various Services.


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E-1

Bridge or Router

Bridge or Router

LAN “A”

LAN “B”

LAN - LAN Interconnection


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Point - Point .

NODE “A”

NODE “B”

CPE

CPE

Customer owns or leases the Equipment at all end points. Arranges for the WAN connections from a service provider.


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Video Camera

Pont - Multipoint / Super Rate Multiplexing. .

6 MHz.

NODE “B”

NODE “A”

Video Monitor

Video Codec

Video Codec

BACK BONE

Compressed Video

Compressed Video

  • - Multimedia i.e Video Conference or to Broad casting centre. Banking (ATM), Paging System etc.

  • Common Interface speeds for compression 384 Kbps and 768 Kbps.


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City 1

Paging Terminal

Landline link

City 2

Paging Control Centre

Paging Terminal

PSTN

Landline link

City N

Paging Terminal

Satellite link

Paging System .


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DXX VOICE APPLICATIONS

Voice Applications include:-

Telephone Line/Number Extension.

Hot line.

PBX extension.

Voice compression.

Between mobile switching centers.

PSTN – PSTN.


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PSTN

Telephone Line Extension .

NODE “A”

NODE “B”

CCO

CCS

Back Bone

EX.


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Hot Line .

NODE “A”

NODE “B”

CCO

CCS

Back Bone


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PBX Extension .

NODE “B”

NODE “A”

CCS

CCO

Back Bone

P B X

PBX is located at customer site.


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DACS Operation .

STM-1/E-1

City 1

City 1

City 2

City 2

City N

City N

Digital Access And Cross Connect System acts as a cross over point (Transit Function) for circuits terminating at the end nodes.


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DXX APPLICATIONS IN MOBILE

  • Analog / Digital mobile traffic between mobile exchanges.

  • Voice compression.

  • Data traffic.

  • LAN interconnection.

  • Bandwidth optimization.


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DXX NODE

DXX NODE

DXX NODE

DXX NODE

DXX Application in Mobile

Alarms

B.S

Alarms

2 Mbps

2 Mbps

B.S

Alarms

B.S

2 Mbps

2 Mbps

Alarms

B.S

B.S

Back Bone


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DXX APPLICATIONS


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Advantages of DXX

  • Efficient utilization of existing transmission bandwidth/infrastructure.

  • Compatible with new emerging standards and future technologies.

  • Video conferencing, integrated voice, data management, ISDN, ATM, Frame Relay and SDH back bone network on same platform.


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Advantages cont’d…

  • During a major fault, traffic can be re-routed automatically, so that existing traffic is un-affected

  • The operator can also assign various service categories to the customers so that the operator's most valuable business is always protected

  • Both of the systems Newbridge & Tellabs have compatibility for frame relay and ATM technology, which is expected to come to Pakistan in near future


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Existing DXX Network

In PTCL, presently three systems are being used for the provision of DXX facilities to the subscribers :

1. MARTIS DXX (TELLABS).

2. NEWBRIDGE (MAINSTREET).

3. Loop Telecom.


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Planned Expansion in DXX Network

  • Cities ----------- 100 to 150 +

  • Sites ------------ 200 to 300 +

  • Nodes ------------ 205 to 450 +


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DXX Systems in Pakistan.

Vendor .NodesSystem

Software.

Tellabs/Martiss DXX. 129 Windows NT

Based.

Newbridge 131 Solaries O.S.

Loop Telecom. 421 Windows

2000 Based.


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Cards used in a “DXX” System.

  • Media / Back Bone Cards.

  • System, Control and Cross Connection cards.

  • Line Driving / Access or Subscriber Cards.


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THANKS