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Bo co TTTN [Type here]

Nguyn Tin Hng - D10CQVT01-N

3.6.1. Dch v nhc ch. .............................................................................. 41

3.6.2. Dch v hp th thoi: ....................................................................... 41

Bo co TTTN Chng 1 Gii thiu Cng ty VTN

Nguyn Tin Hng - D10CQVT01-N Trang 1

Chng 1: GII THIU CNG TY VIN THNG LIN TNH

1.1. Gii thiu chung.

Thnh lp ngy 31/03/1990, Cng ty Vin thng lin tnh (VTN) thnh vin ca Tp

on Bu chnh vin thng Vit Nam (VNPT) - l nh cung cp h tng vin thng sm nht

v ln nht ti Vit Nam.

Vi chc nng xy dng, qun l, vn hnh, khai thc h tng vin thng quc gia, quc

t; t vn, kho st, thit k, xy lp cc cng trnh chuyn ngnh vin thng, trong hn 20 nm

qua VTN lun ch trng u t pht trin h tng vin thng v ng dng cc cng ngh mi,

tin tin nht trn th gii. Nh Cng ty lun gi c v tr dn u trong vic cung cp h

tng vin thng vi mng li dch v rng nht, cht lng truyn dn cao nht v mc

m bo dch v tt nht nhm em li cc li ch vt tri cho khch hng, i tc, gp phn

vo s pht trin t nc.

Vi mc tiu gp phn nng cao hiu qu hot ng v li ch cho cc khch hng v i

tc, ng gp vo s pht trin kinh t x hi ca t nc, cng ty VTN v ang cung cp

cc loi hnh dch v a dng: dch v h tng vin thng (dch v cho thu knh ring, dch v

mng ring o (Megawan, Metronet, Internet)); cc dch v thoi, gi tr gia tng (IMS, 1800,

1900); cc dch v a phng tin (truyn dn tn hiu truyn hnh, truyn hnh hi ngh); cc

dch v mi (VCDN, VCloud) v cc gi dch v tch hp, v.v.

1.2. Mt s dch v VTN ang cung cp.

Dch v truyn s liu.

Knh thu ring:

Dch v knh thu ring l dch v cho thu knh truyn dn vt l dng ring kt

ni v truyn thng tin gia cc thit b u cui mng ni b, mng vin thng dng ring ca

khch hng ti hai a im c nh khc nhau.

Mng ring o:

Dch v VPN, cn gi l dch v Mng ring o (Virtual Private Network) l gii php

cng ngh cho php thit lp mt mng dng ring ca khch hng trn nn mng vin thng

sn c. VPN cung cp kh nng truy cp vo mng trung tm ca t chc cho cc chi nhnh,

vn phng hoc ngi lm vic khp mi ni.

Dch v truyn hnh.

Truyn hnh hi ngh:

Hi ngh truyn hnh (Video conference) l mt bc pht trin t ph ca cng ngh

thng tin, cho php nhng ngi tham d ti nhiu a im khc nhau c th nhn thy v trao

i trc tip vi nhau qua mn hnh tivi nh ang hp trong cng mt cn phng.

Bo co TTTN Chng 1 Gii thiu Cng ty VTN


Truyn dn tn hiu truyn hnh (Transmition A/V):

L dch v truyn dn tn hiu m thanh, hnh nh t ni t chc s kin n i truyn

hnh. Cng ngh chun HD vi tn hiu hnh nh sc nt, m thanh sng ng l gii php tuyt

vi gip cc nh sn xut chng trnh a rp ht v i truyn hnh.

Dch v thoi

Dch v thoi IMS:

Dch v thoi c nh trn nn IMS em n cho cc t chc v doanh nghip c nhiu

chi nhnh trn ton quc mt tri nghim kt ni hon ton mi.Mt h thng mng s dng

giao thc IP cho php khch hng thit lp cc cuc m thoi gia cc my in thoi, cc

my tnh c nhn (PC) trong ni b v vi cc thu bao thng thng khc.

in thoi VOIP 171

y l dch v gi in thoi gi r i ng di lin tnh. Phm vi lin lc ng di

lin tnh l lin lc gia cc my in thoi khng cng a gii hnh chnh mt tnh, thnh ph

trc thuc Trung ng.

Cho thu c s h tng

VTN cho cc khch hng thu a im t thit b, anten, v cc c s h tng khc ti

cc a im ca Cng ty VTN trn ton quc. Khch hng c th l cc doanh nghip cung

cp dch v vin thng (VMS, VNP, VTC,,), b, ngnh, hay cc doanh nghip c nhu cu.

Cc gi dch v tch hp

VTN em n cho khch hng cc gi dch v tch hp, cho php khch hng c th tri

nghim nhiu dch v vin thng (dch v thoi, VPN, Internet, truyn hnh hi ngh...) trn

cng mt ng truyn vt l.

Dch v CSKH/GTGT

Min cc ngi gi 1800

Dch v min cc ngi gi (free phone 1800) ca VTN l mt gii php hon ho,

gip doanh nghip to nn s khc bit vi cc i th cnh tranh, gim thiu chi ph u

t v ti a ho gi tr mang li.

Thng tin Gii tr Thng mi 1900

Dch v cho php thc hin cuc gi, nhn tin ti nhiu ch khc nhau thng qua mt

s truy cp duy nht trn ton quc; nh khch hng d dng nh v tip cn vi cc

dch v.

vCloud Cloud Computing

Dch v vCLOUD - Data Center o trn nn in ton m my ca VTN em li cho

khch hng y nhng li ch ca Cloud Computing. Vi cc li ch mang li cho khch

hng nh l: tnh linh hot cao, khi phc d liu b mt mt, t dng cp nht, d d ton chi

ph u t

Bo co TTTN Chng 2 Tm hiu mng NGN ca VTN


Chng 2 : TM HIU MNG NGN CA VTN

Cc h thng vin thng hin ti c pht trin t cc h thng in bo v in thoi

t th k 19. H thng in thoi u tin tng i n gin do Alexander Graham Bell pht

minh nm 1876. Thi , cc cng ty vin thng cung cp dch v cho mt s lng ln thu

bao thng qua cc mng in thoi chuyn mch cng cng PSTN c ghp knh phn chia

theo tn s (FDM: Frequency Division Multiplexing) hoc ghp knh phn chia theo thi

gian (TDM: Time Division Multiplexing). K thut FDM c s dng t lu v ngy nay

ngi ta hay dng k thut TDM hn do d truyn d liu khng li v tin tc ting ni

c dung lng cao.Sau khong thi gian di pht trin, cng ngh vin thng trn th

gii c nhiu thay i dn n s ra i ca nhiu mng vin thng mi, ph bin nht hin

nay l: mng in thoi c nh PSTN, mng in thoi di ng, mng Internet, h thng thng

tin v tinh.

Cc mng trn song song cng tn ti. Mi mng yu cu phng php thit

k, sn xut, vn hnh, bo dng khc nhau. iu dn n mt s nhc im nh:

- Cng nhc trong vic phn b bng thng;

- Kh khn trong vic t hp mng; - Kh khn trong vic t hp mng;

- Kh khn trong vic cung cp dch v mi;

- u t cho mng PSTN ln;

- Gii hn trong pht trin mng;

- Khng p ng c s tng trng nhanh ca cc dch v d liu.

1.3. L do dn n s ra i ca mng vin thng th h mi

NGN (Next Generation Network) l mt gii php mng nhm nng cao kh nng cung

cp dch v ca cc mng hin nay c th truyn a dch v trn nn tng chuyn mch gi,

hnh thnh mt c s h tng mng vin thng duy nht s dng chung mng li cho nhiu mng

truy nhp khc nhau.

1.4. nh ngha v c im mng vin thng th h mi

1.4.1. nh ngha NGN

NGN l mng hi t c thoi, video v d liu trn cng mt c s h tng da trn nn

tng IP, lm vic trn c hai phng tin truyn thng v tuyn v hu tuyn. NGN l s tch

hp cu trc mng PSTN hin ti vi cu trc mng a dch v da trn c s h tng c sn,

vi s hp nht cc h thng qun l v iu khin. Cc ng dng c bn gm thoi, hi ngh

truyn hnh v nhiu dch v khc.

1.4.2. Cc c im ca NGN

S dng cng ngh chuyn mch mm (SOFTSWITCH) thay th cc thit b tng i

chuyn mch phn cng ( hardware ) cng knh. Cc mng ca tng dch v ring l c kt

ni vi nhau thng qua s iu khin ca mt thit b tng i duy nht, thit b tng i ny

da trn cng ngh SoftSoftswitchitch c v nh l " tri tim " ca NGN.



Mng hi t thoi v d liu, c nh v di ng. Cc loi tn hiu c truyn ti theo k

thut chuyn mch gi.

Mng bng rng cung cp a dch v: Mng truyn dn quang vi cng ngh WDM (

Wavelength Division Multiplexing ) hay DWDM ( Dense WDM ).

1.5. Cu trc mng NGN

Cu trc mng NGN bao gm 5 lp chc nng: lp truy nhp dch v (service access

layer), lp chuyn ti dch v (service transport/core layer), lp iu khin (control layer), lp

ng dng/dch v (application/service layer) v lp qun l (managermeng layer).

1.5.1. Lp truy nhp dch v

Bao gm cc thit b truy nhp cung cp cc

cng kt ni vi thit b u cui thu bao qua h

thng mng ngoi vi cp ng, hoc cp quang, hoc

thng qua mi trng v tuyn (thng tin di ng, v

tinh, truy nhp v tuyn c nh...)

1.5.2. Lp chuyn ti dch v

Bao gm cc nt chuyn mch (ATM+IP) v

cc h thng truyn dn (SDH,WDM), thc hin chc

nng chuyn mch, nh tuyn cc cuc gi gia cc

thu bao ca lp truy cp di s iu khin ca cc

thit b iu khin cuc gi thuc lp iu khin.

1.5.3. Lp iu khin

Lp iu khin bao gm cc h thng iu khin kt ni cuc gi gia cc thu bao

thng qua vic iu khin cc thit b chuyn mch (ATM+IP) ca lp chuyn ti v cc thit

b truy nhp ca lp truy nhp. Lp iu khin c chc nng kt ni cuc gi thu bao vi lp

ng dng/dch v. Cc chc nng nh qun l, chm sc khch hng, tnh cc cng c tch

hp trong lp iu khin.

1.5.4. Lp ng dng/ dch v

Lp ng dng v dch v cung cp cc ng dng v dch v nh mng thng minh IN

(Intelligent Network), tr tin trc, gi tr dch v gia tng Internet cho khch hng thng qua

lp iu khin... H thng ng dng v dch v mng ny lin kt vi lp iu khin thng qua

giao din m API. Nh giao din m ny m nh cung cp dch v c th pht trin cc ng

dng v trin khai nhanh chng cc dch v trn mng.

1.5.5. Lp qun l

y l lp c bit xuyn sut cc lp trn. Cc chc nng qun l c ch trng l: qun l

mng, qun l dch v v qun l kinh doanh.



1.6. Cc thnh phn ca mng NGN

Mi tng quan gia cu trc phn lp chc nng v cc thnh phn chnh ca NGN

c m t trong hnh.

Ta nhn thy, cc loi thit b u cui kt ni n mng truy

nhp (Access Network), sau kt ni n cc cng truyn

thng (Media Gateway) nm bin ca mng trc. Thit b

quan trng nht ca NGN v SOFTSWITCH nm tm ca

mng trc (hay cn gi l mng li). SOFTSWITCH iu

khin cc chc nng chuyn mch v nh tuyn qua cc giao

thc bo hiu v iu khin.

M t hot ng ca cc thnh phn:

1.6.1. Thit b Softswitch

Thit b SOFTSWITCH l thit b u no trong mng NGN. N lm nhim v

iu khin cuc gi, bo hiu v cc tnh nng to mt cuc gi trng mng NGN

hoc xuyn sut qua nhiu mng khc. SOFTSWITCH cn c gi l Call Agent( v

chc nng iu khin cuc gi ca n) hoc Media Gateway Controller - MGC ( v chc

nng iu khin cng truyn thng - Media Gateway).

Thit b SOFTSWITCH c kh nng tng tc vi mng PSTN thng qua cc

cng bo hiu (Signalling Gateway) v cng truyn thng (Media Gateway).

SOFTSWITCH iu khin cuc gi thng qua cc bo hiu, c hai loi:

- Ngang hng (peer-to-peer): giao tip gia SOFTSWITCH v

SOFTSWITCH, giao thc s dng v BICC hay SIP.

- iu khin truyn thng: giao tip gia SOFTSWITCH v Gateway,

giao thc s dng v MGCP hay Megaco/H.248.

1.6.2. Thit b Media Gateway

Nhim v ch yu ca MG - Media Gateway l chuyn i t vic truyn thng

t mt nh dng truyn dn ny sang nh dng truyn dn khc, thng thng l t



dng mch (circuit) sang dng gi (packet). Vic chuyn i ny c iu khin bng

SOFTSWITCH. MG thc hin vic m ha, gii m v nn d liu thoi.

Ngoi ra, MG cn h tr cc giao tip vi mng thoi truyn thng (PSTN) v

cc giao thc khc. Tm li, MG cung cp mt phng tin truyn thng truyn ti

thoi, d liu, fax v hnh nh gia mng truyn thng PSTN v mng gi IP.

1.6.3. Thit b Access Gateway

AG - Access Gateway l mt dng ca MG. N c kh nng giao tip vi my

ch PC, thu bao ca mng PSTN, xDSL v giao tip vi mng gi IP. Trong mng

NGN, cng truy nhp c iu khin t SOFTSWITCH qua giao thc MGCP hay

Megaco/H.248. Lc ny, lu lng thoi t cc thu bao s c ng gi v kt ni

vo mng trc IP.

1.6.4. Thit b Signalling Gateway

SG - Signalling Gateway ng vai tr nh mt cng giao tip gia mng bo hiu

s 7 (SS7 - Signalling System 7) v cc im c qun l bi thit b SOFTSWITCH

trong mng IP. Cng SG i hi mt c kt ni vt l n mng SS7 v phi s dng

giao thc ph hp. SG to ra mt cu ni gia mng SS7 v mng IP, di s iu khin

ca SOFTSWITCH. SG lm cho SOFTSWITCH ging nh mt im nt bnh thng

trong mng SS7. Lu rng SG ch iu khin SS7, cn MG iu khin cc mch thoi

thit lp bi c ch SS7.

1.6.5. Mng trc IP

1.7. Cc giao thc bo hiu trong mng NGN

1.7.1. Megaco/H.248

Megaco/H.248 l bo hiu gia SOFTSWITCH/MGC vi MG (Trunking Media

Gateway, Line Media Gateway hoc IP phone Media Gateway). Megaco/H.248 iu

khin MG kt ni cc lung t ngoi.



Megaco/H.248 tng t vi MGCP v mt cu trc v c mi lin h gia b

iu khin v cng gateway, tuy nhin Megaco/H.248 h tr a dng hn cc loi mng

(v d nh ATM).

1.7.2. BICC

BICC (Bearer Independent Call Control) l giao thc bo hiu gia 2 MGC/Call

Server, c th l t cc nh cung cp khc nhau, nhm mc ch m bo lu lng

thoi dng k thut gi (VoP - Voice over Packet).

BICC h tr cc dch v bng hp (PSTN) mt cch c lp vi ng truyn v

k thut chuyn ti bn tin bo hiu. BICC gp phn n gin ha bo hiu s dng cho

vic giao tip hot ng gia mng truyn thng vo mng NGN.

1.7.3. SIP

SIP (Session Initiation Protocol) l giao thc iu khin lp ng dng c thit

k v pht trin bi IETF. Giao thc SIP c s dng khi to, iu chnh v chm

dt cc phin lm vic vi mt hay nhiu thnh phn tham d.

L giao thc bo hiu m, mm do v c kh nng m rng, SIP khai thc ti

a cng c Internet to ra nhiu dch v mi trong mng NGN.SIP cn c dng

lm bo hiu gia 2 SOFTSWITCH.



1.7.4. H.323

H.323 l giao thc chun cho vic lin lc bng thoi, hnh v d liu trong h

thng mng IP (bao gm mng Internet). H.323 l tp hp cc cun ca ITU cho vic

truyn thng a phng tin v l mt trong nhng chun chnh cho VoIP nh Megaco

hay SIP. Cu trc H.323 gm c cc thnh phn l: terminal, gateway,gatekeeper...

1.7.5. MGCP

MGCP (Media Gateway Control Protocol ) l giao thc VoIP v l mt chun c xc

nh bi IETF, c dng iu khin MG t MGC/SOFTSWITCH. MGCP l mt

giao thc ch/t (master/slave) m qua MG s thc thi cc lnh c gi t

MGC/SOFTSWITCH. MG truyn ti cc loi tn hiu nh thoi, d liu, hnh nh gia

mng IP v cc mng truyn thng (PSTN). C th hiu, trong m hnh MGCP, cc MG

ch trng vo chc nng phin dch tn hiu m thanh, trong khi SOFTSWITCH m

nhn chc nng x l bo hiu v cuc gi.

Ch rng, MGCP v Megaco/H.248 u l giao thc iu khin MG t

MGC/SOFTSWITCH. Tuy nhin, Megaco/H.248 l giao thc mi hn.

1.8. Mng NGN ca VNPT

Cu trc:

SURPASS hiQ: L h thng my ch tp trung cho lp iu khin, vi chc nng iu

khin cc tnh nng thoi v kt hp kh nng bo hiu ktni vi nhiu mng khc

nhau. Tu theo chc nng v dung lng, hiQ c chia thnh cc loi hiQ 10, 20, 9100,

9200, 9400.

SURPASS hiS - Gateway bo hiu.

SURPASS hiG: L cc h thng cng phng tin (MG), nm bin mng ng trc

v chu s qun l ca SURPASS hiQ.

SURPASS hiA: L h thng truy nhp a dch v, phc v cho truy nhp thoi, xDSL

v cc dch v s liu trn mt nn duy nht. cung cp cc gii php truy nhp,

SURPASS hiA c th kt hp vi tng i EWSD hin c qua giao din V5.2 cng nh

cngvi SURPASS hiQ to nn mng th h mi. SURPASS hiA chia thnh nhiu loi:

7100, 7300, 7500.

H thng qun l

- NetManager: h thng qun l cho chuyn mch th h sau, s dng SNMP v

chy trn nn JAVA/CORBA, c giao din HTTP qun l qua trang web.

- TNMS cho truyn ti quang th h sau;

- AccessIntegrator cho truy nhp th h sau

Cu trc mng NGN ti VTN gm cc thnh phn:

Core Router M320, Edge Router R690, BRAS Router ERX

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