APPLICATIONS MAINTAINING LIVE GSM NETWORKOMC DEPARTMENTHARSHIT TRIVEDI (11BEC091)TRAINEE AT NOKIA NETWORKS(FORMERLY NSN)

DEPARTMENT HEADMR. BHAVIN MODI

GUIDED BYPROF. KHYATI VACHHANI

Where OMC stands in GSM architecture

OVERVIEWOMC and its purpose in Telecom

Digital transmission protocols

Network management system

Application applied during the project

Conclusion

OMC IN TELECOM There are total four departments in NSN

RF Planning and Optimization

OMC-Transmission

BSS

Switching

OMC(Operation and Maintenance Centre) is heart of telecommunication.

Very crucial department and working 24x7 round the clock.

In GSM architecture it is situated between BSC(base station controller) to MSC(mobile switching centre)

DIGITAL TRANSMISSION PROTOCOLS

(1) PDH(Plesiochronous digital hierarchy)

PDH is former technology used in telecommunications networks to transport large quantities of data over digital transport equipment via “FIBRE OPTIC” and “MICROWAVE RADIO SYSTEMS”.

PDH allows transmission of data streams that are nominally running at the same rate, but allowing some variation on the speed around a nominal rate.

There is no link between watches to guarantee they run at exactly the same rate

(2) SDH(Synchronous Digital Hierarchy) OR SONET(Synchronous Optical Networking)

SDH is successor of PDH, uses TDMA for constant stream of information , it uses optical fibre, microwave radio and electric interface (RJ45 Ethernet radio).

This method was adopted to send large amounts of telephone calls and data traffic over the same fibre without synchronization problems.

The STM-1(Synchronous Transport Module level-1) frame is the basic transmission format for SDH.

Network management system(NMS)Architecture of system

NMS

Switch

EMS EMS EMS………………

NMS(Network Management System): It provides an integrated system for sharing device information(nodes) across management applications, automation of device management tasks.

There are three NMSs in NSN.

(1)ECI Telecom: SDH

(2)Huawei: SDH and Ethernet radio

(3)NEC: Ethernet Radio

EMS(element management system): It is capable of scaling as the network grows, maintaining high performance levels as the number of network events increase, and providing simplified integration with third-party systems. It meets the service provider's expectations for integrated operational support systems.

EMS function is divided into 5 key areas i.e. fault, configuration, accounting, performance and security

There are total 8 servers in the system, 7 for EMS allocated according to equipment and 1 for NMS.

CISCO’s switches provide soft switching operations.

MAJOR APPLICATIONS OF NMSService trail creation

Uploading and removal of node

Alarm watching and handling

Creation and restoration of all the configuration detail of network

Traffic shifting

Clock synchronization

Swapping of node

USDM uploading

Home screen of ECI Telecom’s NMS

Both the NMS are based on LINUX environment

Attached directly with the system servers via SNMP(Simple Network Management Protocol)

They require third-party client to get logged in within the system and supporting package managers

Huawei uses its own iManager 2000

ECI uses GOGlobal third party client and SmartLight package manager

Huawei’s NMS Cost is less.

-Chinese firm Integrated

- Compatible with RTN series(910 and 950) equipment.

- Works on both types of channel Optical fiber and Radiolink. Easy to configure with hardware and servers.

- Huawei has own set of hardware. Service support is very good Advanced features

ADVANCED FEATURES 3 link creation

4Tunnel service creation

Ethernet over SDH(EOS) path creation

Simple node creation and deletion: When new BST unit takes place or to be uploaded virtually on the entire network.

2 node configuration: After node uploading it is required to configure with nearly available existing node

We can assign as per the requirement and availability

- Frequency(IF), Modulation technique, Bit rate, Tx Power, channel bandwidth, protection path

- At last we have to synchronize with real time clock.

- Flexible to configure according to type of services.

- Here advanced feature of 3-link configuration is available to expand services and bandwidth.

4 tunnel creation:

a tunneling protocol allows a network user to access or provide a network service that the underlying network does not support or provide directly.

Here the service provider is a user to take advantage of foreign protocol over existing protocols(SDH, SONET and PDH) for betterment of services offering to subscribers.

Here we had created 4tunnel service to enable Multiprotocol Label Switching (MPLS) to avoid conventional routing table and provide fast telecommunication network.

Enable PWE service using 4tunnelin: pseudo-wire (PWE) is an emulation of a point-to-point connection over a packet-switching network (PSN). Here we enabled 3g via circuit emulation service(CES).

ETHERNET IN TELECOM Carrier Ethernet (ETH) is useful in telecommunications network providers to provide Ethernet services to customers and to utilize Ethernet technology in their networks.

Important terms:

- CIR: Committed information rate, the average bandwidth for a virtual circuit

- PIR: Peak Information rate

- EIR: Excessive information rate

- PIR= CIR + EIR

These data is required to enable and control Data pack over ETH

tightVNC FOR CONFIGURATION TightVNC is a cross-platform free and open-source remote desktop software application that uses and extends the RFB protocol of Virtual Network Computing (VNC) to control another computer's screen remotely

RFB( Remote Frame Buffer) is the protocol to use and control remote computer using GUI.

It is most preferable VNC platform for Windows operated computer to work on server level administration.

CONCLUSION learnt different parameters, protocols, tools, architecture being used in recent telecom industry from the scratch. I started with fundamentals of telecom protocols and architecture subsequently became familiar with major tools.

Designed various services operating live GSM network as well as bootstrapped the problems maintaining those services properly using different applications.

Thank You