TELEPHONE CALLS & CONNECTIONS IN THE FIXED NETWORK ETI2506 - - PowerPoint PPT Presentation

TELEPHONE CALLS & CONNECTIONS IN THE FIXED NETWORK

ETI2506 Monday, 24 October 2016

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WHERE ARE WE IN THE CURRICULUM?

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LOCAL EXCHANGE (F (FOLDED)

• 1. A local area in telecommunications is a

geographic area within which calls are charged at the same rate.

• 2. Subscribers of a local area are

connected to their respective telephone exchange called local- exchange or local switch or terminal exchange.

056-XXXXXX

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LOCAL MULTI-EXCHANGE AREA

• A multi-exchange local area has a large

number of subscribers one exchange cannot effectively and economically serve all of them, e.g. Nairobi.

• In this case each local exchange has its
• wn area called exchange area and the

envelope of all exchange areas would be the local area.

• The capacity of the junctions is based
• n the peak-hour traffic between the

local exchanges.

30 T 20 T 25 T 800L 1200L 2000L

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PRACTICAL LOCAL EXCHANGE DIS ISTRIBUTION

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Cabinet

• No. 6

Cabinet

• No. 8

Cabinet

• No. 5

Cabinet

• No. 4

400 Pair Cable 200 Pair Cable Cabinet

• No. 10

400 Pair Cable 400 Pair Cable 2000 Pair Cable 200 Pair Cable Telkom House Distribution Point No. 4 Distribution Point No. 6

FADING FIXED TELEPHONE NETWORK

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Open Wire Transmission Lines (Obsolete) Telephone Cabinets (Still in Use in Urban Areas) Telephone Drop Points (DPs) (Still in Use in Urban Areas)

NAIROBI FIXED NUMBERING PLAN

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LOCAL TRANSIT EXCHANGE

• A multi-exchange local area may have a

transit (also called local transit) exchange.

• A transit, unlike a local exchange, does

not have subscribers connected to it and therefore does not act as a source or sink for traffic in the network.

• It only collects and redirects the traffic

among the exchanges in the local area.

Local Transit Exchange Parklands 3,000L Kariobangi 5,000L Westlands 7,000L Industrial Area 8,000L Nairobi Central 20,000L

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NATIONAL NUMBERING PLAN - KAKAMEGA

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http://ca.go.ke/images/downloads/NUMBERING/TELECOMMUNICATION%20NUMBERING%20PLAN%20FOR%20KENY A%20SEPTEMBER%202016.pdf

NATIONAL NUMBERING PLAN – BUSIA & BUNGOMA

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http://ca.go.ke/images/downloads/NUMBERING/TELECOMMUNICATION%20NUMBERING%20PLAN%20FOR%20KENY A%20SEPTEMBER%202016.pdf

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NATIONAL NUMBERING PLAN – KIS ISUMU & SIA IAYA

REGIONAL AND IN INTERNATIONAL EXCHANGES

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Area Switching Centre (ASC) Kakamega 056-2030XXX Bungoma/Busia 0552030XXX Kisumu 057-202XXXX National Switching Centre International Switching Centre 000

• 1. Area Switching Centre (ASC)

switches transit traffic between different local exchanges.

• 2. Example: The Area Switching

Centre for western region is based in Kisumu.

NATIONAL DESTINATION CODES (N (NDCs) FOR FIX IXED TELEPHONY SERVICES

55 Bungoma and Busia 56 Kakamega, Butere, Mbale and Mumias 57 Kisumu, Maseno and Siaya 58 Kisii, Kilgoris, Oyugis and Nyamira 59 Homabay and Migori 60 Muranga and Kirinyaga 61 Nyeri 62 Nanyuki 63 Reserved for future use 64 Meru, Maua and Chuka 66 Thika and Ruiru 67 Kiambu and Kikuyu towns 68 Embu 69 Marsabit and Moyale

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20 Nairobi City 40 Kwale Town area 41 Mombasa, Mariakani and Kilifi towns 42 Malindi, Lamu and Garsen towns 43 Voi, Taveta, Wundanyi and Mwatate towns 44 Machakos, Makueni, Kitui and Mwingi 45 Ngong, Kajiado, Loitokitok and Athi River 46 Garissa, Hola, Wajir and Mandera 50 Naivasha and Narok 51 Nakuru 52 Kericho and Bomet 53 Eldoret, Turbo, Kapsabet, Iten and Kabarnet 54 Kitale, Moisbridge, Kapenguria and Lodwar

IN INTERNATIONAL ACCESS CODES/MOBILE ACCESS

000 International Dialling Access 004 East Africa Regional Access Code for Rwanda 005 East Africa Regional Access Code for Kenya 006 East Africa Regional Access Code for Uganda 007 East Africa Regional Access Code for Tanzania 07 Telephony or ‘’Find me anywhere’’ Services

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005 007 003 004 006 254

SHORT CODES

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Short codes/short numbers are special telephone numbers, significantly shorter than full telephone numbers, that can be used for: (a)Abbreviated dialling (b)SMS (c)MMS