Making the Remaining Chapters- Chapter 3

CHAPTER III

SWITCHING SYSTEM

Time Division Multiplexing

Time-division multiplexing (TDM) was invented as a way of maximizing the amount of voice traffic that could be carried over a medium. In the telephone network before multiplexing was invented, each telephone call required its own physical link. Proving unscalable and expensive, this method had to be abandoned. TDM increases the capacity of the transmission link by slicing time into smaller intervals so that the bits from multiple input sources can be carried on the link, effectively increasing the number of bits transmitted per second. 

Alcatel-Lucent 7549 Media Gateway

 

With its flexible scalability, numerous integrated functions, advanced voice quality enhancement (VQE) features, and powerful IP-to-IP processing capabilities, the Alcatel-Lucent 7549 Media Gateway (MGW) effectively meets today’s mobile service providers’ needs for cost-effective Global System for Mobile Communications (GSM)/Universal Mobile Telecommunications System (UMTS) service introduction, capacity expansion, and voice core renovation. It also provides long-term investment protection by evolving to the all-IP network, IP Multimedia Subsystem (IMS), and Long Term Evolution (LTE). The 7549 MGW, built with state-of-the-art digital signal processor (DSP), computing, and media processing components, supports separate IP and TDM switch fabrics for high quality, native interworking for IP-to-IP, TDM-to-IP, and TDM-to-TDM applications. By using Adaptive Multi-Rate Wideband (WB-AMR) and voice quality enhancement features such as Automatic Level Control and Adaptive Noise Reduction, the 7549 MGW also delivers superior voice quality over IP and TDM. Its numerous integrated functions and features, such as the integrated signalling gateway and interworking function, reduce the operator’s total cost of ownership by limiting the number of additional network elements required. As an integral part of the Alcatel-Lucent Mobile Next-Generation Network (NGN) solution, the 7549 MGW also shares the same integrated Wireless Element Manager used by the Alcatel-Lucent 5060 Wireless Call Server (WCS), simplifying network configuration, provisioning, and management.

Multiservice Media Networking

• Built on leading-edge technology with state-of-the-art DSP, computing, and media processing components
• All-in-one voice server cards, with integrated DSPs and echo cancellers
• Integrated features: media server, signalling gateway (SGW), interworking function (IWF), internal signalling relay function (SRF)
• Offers IP and TDM switch fabrics for high quality, native interworking at TDM-to-TDM, TDM-to-packet, and packet-to-packet network borders
• Supports up to 96,000 ports with an industry-leading capacity per footprint density ratio
• Advanced VQEs for Voice over Internet Protocol (VoIP) and TDM, including Automatic Level Control, Adaptive Noise Reduction, Voice Activity Detection, Silence Insertion/Detection, Comfort Noise Generation, Packet Loss Concealment, Adaptive Jitter Buffer, and WB-AMR
• Powerful IP-to-IP processing capabilities with IP Transcoding, multi-path Open Shortest Path First (OSPF) for Layer 3+ routing and control, and Multi-Protocol Label Switching (MPLS) Resource Reservation Protocol - Traffic Engineering (RSVP-TE) for Quality of Service (QoS)
• Operational ease of unified operations, administration, and maintenance (OA&M) with the 5060 WCS
• High network resiliency with Mobile Switching Center (MSC) Pooling, virtual Media Gateway (MGW), and Non-Access Stratum (NAS) Node Selection Function (NNSF)
• Evolves to the all-IP network, IMS, and LTE

Features

•Purpose-built, high capacity, multifabric

media gateway for mobile

service providers

•Innovative generation of gateway

technology with integrated media

server, integrated signaling

gateway (iSGW) * and Interworking

Function (iIWF) *.

•M3UA-based iSGW card performs

reliable SS7-to-IP interworking

SIGTRAN as well as limited SS7-to

SS7 STP functionality.

•Support for multiple interfaces

with ATM/TDM/IP

•Extensive set of GSM/UMTS and IMS

features, CODECs, and interfaces,

including DTMF, conferencing,

tones, announcements, TFO-IPE,

TFO and TrFO * and VQEs

•Integrated Wireless Element

Manager (WEM) in the Alcatel-

Lucent 5060 WCS manages both the

5060 WCS and the 7549 MGW

•Highly reliable MGW based on field

proven software

Benefits

• Reduced CAPEX and time to market

through modular, distributed

architecture, offering efficient

rollouts

• High-capacity media gateway with

small footprint, dramatically

reducing real estate requirements

• Integrated features reduce network

elements and simplify network

management

• iSGW card provides built-in, cost

effective SGW capability for both

TDM and IP networks

• Latest technology voice-server card

with integrated digital signal

processing, echo cancellation and

media processing resources

• iIWF resides on existing card,

avoiding a specialized chassis or card

that increases footprint or diminishes

capacity

• Seamless migration from 2G to 3G

and IMS

• Media optimization and transcoderfree

capabilities ensures high voice

quality

• Ease of integration into existing

networks

• Field-proven MGW reduces network

outages and operating costs

MDF or Main Distribution Frame

Main Distribution Frame (MDF) is a distribution frame on one part of which the external trunk cables entering a facility terminate, and on another part of which the internal user subscriber lines and trunk cabling to any intermediate distribution frames terminate. It interconnects and manages the telecommunications wiring between itself and any number of IDFs (Intermediate distribution frame), which connects internal lines to the MDF. The MDF is used to cross-connect any outside line with any desired terminal of the multiple cabling or any other outside line. The MDF usually holds central office protective devices and functions as a test point between a line and the office. The MDF in a private exchange performs functions similar to those performed by the MDF in a central office.

 

Brief introduction: 

1) The HPX67 main distribution frame (MDF), a double-sided frame, consists of vertical side (line side), horizontal side (exchange side), alarming system 
and the frame itself, with optional stepladders 
2) The vertical side can be equipped with FT203 protection connection blocks 
(100 pairs), FA906 protectors as well as alarm system 
3) The horizontal side can be equipped with FT206 test connection blocks 
(100 pairs) 
Features: 
1) Complete I.D.C. type MDF 
2) Sound and reliable protection against over voltage and over current 
3) Unique FS Fail-Safe protection and self-recovery protector 
4) Modular design, easy installation, quick wiring, convenient maintenance 
5) The application of PC material greatly improves module's strength and 
anti-aging capability 
6) Up to four grades of audio/visual alarms are provided 
7) Preferable capacity: 1,200, 3,000, 4,000, 5,000 and 6,000 pairs are 
optional 
8) Besides, due to its modular design, any capacity can be reached at your 
preference 
Technical specifications: 
1) Insulation resistance: ≥1,000MΩ 
2) Dielectric strength: ≥1,000V (AC voltage, 50Hz for 1 minute), no 
spark-over and no flying arc 
3) Contact resistance between conductor and reed: ≤3mohm 
4) Contact resistance between reeds: ≤7MΩ 
5) Conductor diameter range: 0.4 - 0.8mm 
6) Pulling strength: ≥25N

4,000 Watt Portable Diesel Generator

The D4500E is designed for heavy duty service on the job site or as temporary standby-power and features a premium 7.8 HP diesel engine with electric starting. This unit features brushless HD alternators with THD less than 6%. The D4500E generator is equipped with an automatic voltage regulator for clean power, wheel kit, voltmeter, main line circuit breaker, frame mounted control panel, large metal fuel tank w/ chrome cap, battery rack and cables and is electric start.

EPA soundproof diesel generator set

  

30kva-1500kva diesel generator:
1.souldproof diesel generator set
2.CE Certificate
3.ISO9001-2000
4.Cummins,deutz option 

CELLYTE 12TLG BATTERY

 

SEC batteries have been used in the industrial battery market for over 20 years. SEC’s highquality, 10 year design life, reliable Gel technology lead acid batteries have a proven record andwe have now extended our range of 12TLG batteries to include larger sizes. New features includehandles for easy lifting, brass insert terminals for higher current capacity and reduced damageduring transportation, designed to comply with EUROBAT (draft IEC 896-2), IEEE, JIS and BS6290 Part 4, using UL certified components.

HPSµV Telecom Rectifiers

  

CONTACTOR BASED AUTOMATIC TRANSFER SWITCHES 

A critical component of any emergency power system, Eaton's contactor based automatic transfer switch quickly and safely shifts the load circuit from a normal power source to the emergency source, permitting critical loads to continue running with minimal or no outage in momentary losses of power. Designed with operational simplicity in mind, the compact design and user friendly front panel interface simplifies routine operation, programming, and setting adjustments.