tài liệu về switching and amplifying

Tài liệu GSM Switching, Services and Protocols P1 pdf

... Broadcast (DAB) and Digital Video Broadcast (DVB), are very interesting for wireless transmission of radio and television stations as well as for audio- and video-on-demand and broadband transmissionof ... forsetting GSM standards for the last 18 years. Their remaining and further work has beentransferred to groups inside and outside ETSI; most of the ongoing work has been handedover to the ... of, and the mobile exchanges can be constructed with standard components.In parallel to the standardization efforts of ETSI, already in 1987 the then existing prospec-1.3 Some GSM History and...

Tài liệu GSM Switching, Services and Protocols P2 pdf

Danh mục: Hóa học - Dầu khí

... multiple of its original bandwidth. Typically, spreading factors are between 10 and 1000; they generate a broadband signal for transmission from the narrowband signal, and this is less sensitive ... communication between mobile and base station,the available frequency band is split into two partial bands, to enable simultaneous sending and receiving. One partial band is assigned as uplink ... station) and theother partial band is assigned as downlink (from base to mobile station):² Uplink: transmission band of mobile station  receiving band of base station² Downlink: receiving band...

Tài liệu GSM Switching, Services and Protocols P3 docx

Danh mục: Hóa học - Dầu khí

... called subsystemsin the GSM standard. The respective three subsystems are the Base Station Subsystem(BSS),the Switching and Management Subsystem (SMSS) ,and the Operation and Main-tenance Subsystem ... authentication and user data encryp-tion based on the subscriber identity IMSI and secret keys. Beyond that,the SIM can storeshort messages and charging information ,and it has a telephone book function and ... Mobile Switching Network (MSS)The Mobile Switching and Management Subsystem (SMSS) consists of the mobile switch-ing centers and the databases which store the data required for routing and service...

Tài liệu GSM Switching, Services and Protocols P4 ppt

Danh mục: Hóa học - Dầu khí

... the control and modi®cation of extended services and are only usable in connection with a telecommuni-cation service.4Figure 4.1: Bearer and teleservicesGSM Switching, Services and Protocols: ... network and processes them in a store -and- forward mode. Theinterface has not been speci®ed and can be by DTMF signaling, special order, email, fax,etc. The delivery can be time-shifted and is ... the GSM standard, the menu of services known fromISDN is being made available in stages [7] and supplemented by some new GSM-speci®cperformance characteristics. In Phase 2, which was standardized...

Tài liệu CCIE Routing and Switching Exam Certiﬁcation Guide P2 docx

Danh mục: Quản trị mạng

... frame, and places a frame on Ethernet 2 (data link). Host 2 receives bits (physical) from the Ethernet cable and converts the bits into a frame (data link). Then, the IP protocol is examined and ... hex to binary and then binary to decimal.Binary NumbersThe binary number system uses two digits: 1 and 0. Binary numbers are primarily used by computer systems. IP addresses and MAC addresses ... shown as binary or in dotted decimal format. Some show commands have output information in hexadecimal or binary formats. As a CCIE candidate, you must be prepared.Router 1Serial LinkHost...

Tài liệu CCIE Routing and Switching Exam Certiﬁcation Guide P1 pptx

Danh mục: Quản trị mạng

... helps standardize the design and construction of the networks for developers and hardware manufacturers, and also helps network engineers and analysts with a framework for the understanding ... general networking theory, bridging and LAN switching, LAN and WAN media, IP theory, IP routing protocols, performance and trafﬁc management, security, and multiservice. CCIE C&S The ... replaces the CCIE WAN Switching and CCIE Internet service provider (ISP)-Dial certiﬁcation. The CCIE C&S candidate must pass a two-hour written qualiﬁcation test and a hands-on one-day lab...

Tài liệu GSM Switching, Services and Protocols P5 docx

Danh mục: Hóa học - Dầu khí

... always assigned and usedwith a TCH or an SDCCH. The SACCH carries information for the optimal radiooperation, e.g. commands for synchronization and transmitter power control and reportson channel ... receivesRFCH 15±50 and 83±103, in which case RFCH 1, 14, 51, 82, 104, 105, and 121±124 areleft unused as additional guard bands.Each of the 200 kHz channels is divided into eight time slots and thus ... and BSS to a new situation if necessary. Thereafter, the measurement data and the result of the power control activity are supplied to the handover process, which canthen decide whether a handover...

Tài liệu GSM Switching, Services and Protocols P6 doc

Danh mục: Hóa học - Dầu khí

... can calculate a set of (RAND, SRES) 2-tuples in advance, store them in the HLR, and send them on demand to the requestingVLR. The VLR stores this set (RAND[n], SRES[n]) and uses a new 2-tuple ... traf®c on the radio channel. Onone hand this should ensure the con®dentiality of user data and signaling traf®c, on theother hand it should also prevent localizing and tracking of a mobile station. ... (e.g. a handover command), the currentdata block n is replaced by the convolutional coded FACCH message, and it is interleavedin a block-diagonal way with the data blocks (n 2 1) and (n 1 1)...

Tài liệu GSM Switching, Services and Protocols P7 ppt

Danh mục: Hóa học - Dầu khí

... the handover procedure, which is also initiated onlyfrom the network side and, for example, becomes necessary if the current cell is left. Incontrast to assignment command,ahandover command ... BSIC and BCCHfrequency), the procedure variant to establish a physical channel (asynchronous orsynchronous handover, Figure 7.24), and a handover reference number.Having received a handover ... de®ned between MS and BSS, more exactly between MS and BTS. Within the BSS, the BTS and the BSC cooperate over the Abis interface, whereas theA interface is located between BSC and MSC. The MSC...

Tài liệu GSM Switching, Services and Protocols P8 pdf

Danh mục: Hóa học - Dầu khí

... of the handover and through transferring the handover decision to the BSS. The GSM handover is thus anetwork-originated handover as opposed to a mobile-originated handover, where thehandover ... three categories:² Handover because of more favorable path loss conditions² Mandatory intercell handover² Mandatory intracell handover8.4 Handover199has only received and stored the current ... complete handover decision algorithm in the MSC.8.4.4 MAP and Inter-MSC HandoverThe most general form of handover is the inter-MSC handover. The mobile station movesover a cell boundary and enters...

Tài liệu GSM Switching, Services and Protocols P9 pptx

Danh mục: Hóa học - Dầu khí

... a network transition switching unit and carried as a voiceband signal in the PSTN to the analog terminal.After these introductory remarks, the GSM data and teleservices and their realization ... activates an appropriate modem function and converts the digital data signals into an analog voiceband signal. The IWF digitizes thisvoiceband signal again and passes the data on in PCM-coded format ... MT1 to the standard ISDN (RA1, RA2), and then converted in MT1 overRA2, RA1, and RA10to the channel bit rate at the air interface. Provided with an FEC, thedata is transmitted and then converted...