22. thuyet minh tcvn cap dong vao nha thue bao
DESCRIPTION
22. Thuyet Minh TCVN Cap Dong Vao Nha Thue BaoTRANSCRIPT
Khi qut v tnh hnh sn xut v s dng cp thu bao trong nc
B THNG TIN V TRUYN THNG
HC VIN CNG NGH BU CHNH VIN THNG VIT NAM
VIN KHOA HC K THUT BU IN
* * *
THUYT MINH D THO TIU CHUN QUC GIA MNG VIN THNG - CP SI NG VO NH THU BAO - YU CU K THUTH NI - 2010
MC LC31. Tng quan v tnh hnh tiu chun ho cp ng v cp vin thng vo nh thu bao
3a. Trong nc
4b. Ngoi nc
52. Tnh hnh s dng v sn xut cp ng vo nh thu bao ti Vit Nam
5a. Tnh hnh s dng cp vo nh thu bao
7b. Tnh hnh sn xut cp
133. Cch thc xy dng tiu chun
1. Tnh hnh tiu chun ho cp ng v cp vin thng vo nh thu baoa. Trong nc
Hin nay Vit Nam ban hnh mt s tiu chun k thut v phng php o cp in v cp vin thng, c th:1. TCVN 5936: Cp v dy dn in. Phng php th cch in v v bc (Hp cht do v nha chu nhit)
2. TCVN 4766: Cp dy dn v dy dn mm. Ghi nhn, bao gi, vn chuyn v bo qun
3. TCVN 5582: Cp v dy dn mm. Phng php xc nh ch tiu c hc ca lp cch in v v4. TCVN 6614-1-1: 2000: Phng php th nghim chung i vi vt liu cch in v bc ca cp in. Phn 1: Phng php p dng chung - Mc 1: o chiu dy v kch thc ngoi- Th nghim xc nh c tnh c.
5. TCVN 6614-1-2: 2000: Phng php th nghim chung i vi vt liu cch in v bc ca cp in. Phn 1: Phng php p dng chung - Mc 2: Phng php lo ho nhit.
6. TCVN 6614-1-4: 2000: Phng php th nghim chung i vi vt liu cch in v bc ca cp in. Phn 1: Phng php p dng chung - Mc 4: Th nghim nhit thp.7. TCN 68-132: 1998 Cp thng tin kim loi dng cho mng in thoi ni ht (sot xt ln th 1)
Cc TCVN ch cp n ch tiu c l ca dy v cp in mc chung, cha c tiu chun no cp c th n cp vin thng si ng vo nh thu bao. Mt s TCVN khc a ra cc php o nh gi cc ch tiu c l ca cp in ni chung. Cc TCVN 6612-1-1, TCVN 6612-1-2 v TCVN 6612-1-4 l hon ton tng ng vi cc tiu chun ca IEC: IEC 60811-1-1, IEC 60811-1-2, v IEC 60811-1-4. Cc tiu chun, quy trnh, quy phm ca B Thng tin v Truyn thng cng nh ca cc doanh nghip cp n cc loi cp in thoi khc nhau nh cp LAN, cp chng chy, cp dng trong mng in thoi ni ht... v cc quy trnh thi cng, o th mng cp. Tuy nhin vn cha c tiu chun no v tiu chun cho cp si ng vo nh thu bao.b. Ngoi nc
Hin nay, mt s t chc tiu chun quc t nh IEC, ANSI, TIA, ITU v mt s quc gia ban hnh mt s tiu chun v cc ch tiu k thut v phng php o nh gi cc ch tiu in v ch tiu c l ca cp vo nh thu bao cung cp dch v thoi v cc dch v truy nhp bng rng xDSL.
T chc IEC
- Tiu chun v ch tiu k thut
1. IEC 62255-1: Multicore and symmetrical pair/quad cables for broadband digital communications (high bit rate digital access telecommunication networks)- Outside plant cables Part 1: Generic specification
2. IEC 62255-4: Multicore and symmetrical pair/quad cables for broadband digital communications (high bit rate digital access telecommunication networks)- Outside plant cables - Part 4: Aerial drop cables Sectional specification
3. IEC 62255-5: Multicore and symmetrical pair/quad cables for broadband digital communications (high bit rate digital access telecommunication networks)- Outside plant cables - Part 5: Filled drop cables Sectional specification
4. IEC 60708- Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath.
- Tiu chun v phng php o
1. IEC 60811-1-1, Common test methods for insulating and sheathing materials of electric and optical cables Part 1-1: General application Measurement of thickness and overall dimensions Test for determining the mechanical properties
2. IEC 60811-1-3, Common test methods for insulating and sheathing materials of electric and optical cables- Part 1-3: Methods for general application- Methods for determining the density Water absorption test Shrinkage test
3. IEC 60811-1-4, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section Four: Tests at low temperature
4. IEC 60189-1, Low-frequency cables and wires with PVC insulation and PVC sheath Part 1: General test and measuring methods.
5. IEC 60811-4-2 , Common test methods for insulating and sheathing materials of electric cables Part 4: Methods specific to polyethylene and polypropylene compounds Section Two: Elongation at break after pre-conditioning Wrapping test after pre-conditioning Wrapping test after thermal ageing in air
Tiu chun v cp vo nh thu bao ca mt s quc gia
1. Tiu chun ca Singapore: Booklet of Specifications for Telecommunication Cables and Ancillary Accessories. iDA Singapore
2. Tiu chun ca B nng nghip M:
+ Bulletin 1753F-204, RUS Specification for Aerial Service Wires
+ Bulletin 1753F-206 (PE-86), REA Specification for Filled Buried Wires
3. Tiu chun ca Palestin: Technical specification of telephone cables
2. Tnh hnh s dng v sn xut cp ng vo nh thu bao ti Vit Nam
a. Tnh hnh s dng cp vo nh thu bao
Cp vo nh thu bao l mt phn ca ng dy thu bao c ko t hp cp ti cc thit b u cui khch hng. Cp vo nh thu bao c th dng treo hoc chn ngm.
Cp vo nh thu bao (hay cn gi l dy thu bao) gm mt hoc vi i dy c t song song vi nhau (i vi trng hp ch l 1 i dy) hoc xon li vi nhau theo tng i (trng hp t 2 i dy tr ln).
Xt v mt phng php lp t, cp vo nh thu bao c chia lm hai loi:
Cp vo nh thu bao loi treo;
Cp vo nh thu bao loi chn ngm.
Hin nay trong nc phn ln s dng cp vo nh thu bao loi treo v t s dng cp vo nh thu bao loi chn ngm. Tuy nhin ng v mt m quan th cp chn ngm c u im hn, do xu hng ti cc khu th, ni thnh trong nhng nm ti l ngm ho mng cp vo nh thu bao.
Xt v mt cu trc li dn, cp vo nh thu bao c chia thnh hai loi:
Dy c mt si;
Dy mm nhiu si.
ng knh ca li dn c th l 0,4 mm; 0,5 mm; 0,6 mm; 0,65 mm; 0,8 mm hoc 0,9 mm.
Cc s liu thu thp c qua kho st ti mt s doanh nghip Vin thng cho thy:
Cc Vin thng tnh trc thuc VNPT hin nay vn ch yu s dng loi dy thu bao 1 i dy treo c ng knh li dn l 0,5 mm.
Ti Vin thng H Ni hin nay trin khai cp thu bao 2 i chn ngm v treo c ng knh li dn 0,5 mm ti mt s khu vc ni thnh.
Khong cch trung bnh t hp cp n nh thu bao ti cc Vin thng tnh thng ln hn 100 m. Ti mt s thnh ph ln, c bit l khu vc ni thnh khong cch ny nh hn, ch t 30 m n 50 m. Khong cch ln nht t hp cp n nh thu bao thng trn 1 km.
Cp vo nh thu bao c th l loi dy c mt si hoc dy mm nhiu si. u im chnh ca loi dy mm nhiu si l c mm do cao hn, d dng lp t hn so vi loi dy c mt si.
Nhn xt: Qua nghin cu tnh hnh ti cc doanh nghip Vin thng cho thy hin nay cp vo nh thu bao hu ht l loi 1 i dy c li c v ng knh li dn l 0,5 mm. Vic la chn cp vo nh thu bao cha c s thng nht v cha c s c r rng v hin nay cha c tiu chun no v cp vo nh thu bao p dng thng nht.
b. Tnh hnh sn xut cp
Hin nay c rt nhiu cng ty trong nc v kinh doanh nhp khu cp thng tin kim loi.
Cc doanh nghip sn xut trong nc (SXTN) v kinh doanh nhp khu (NK) cp thng tin kim loi bao gm:
S TTTn doanh nghipSXTNNK
1Cng ty c phn cp v vt liu vin thng SACOMx
2Cng ty vt t Bu in 2- POTMASCOx
3Cng ty vt t Bu in 1- COKYVINAx
4Nh my thit b Bu in (Cng ty C phn Thit b Bu in) POSTEFx
5Nh my Vt liu Bu in (Cng ty C phn Vt liu Bu in)x
6Cng ty lin doanh cp Vinadaesungx
7Cng ty vt t Bu in- Bu in TP H Ch Minhx
8Cng ty C phn u t v sn xut Vit Hnx
9Cng ty C phn Vnh Khnhx
10Nh my Dng c in 43x
11Cng ty TNHH Pht trin cng ngh Vin thngx
12Nh my thng tin M3x
13Cng ty C phn Vin thng Thng Longx
14Cng ty C phn 3Tx
15Vn phng i din Cng ty Yurtec Corporationx
16Cng ty C phn Quc t Sun Ivyx
17Cng ty TNHH TICOx
18Cng ty TNHH Thit b thng tin COMTECx
19Cng ty C phn quc t Cng ngh v Truyn thng Quang Dngx
20Cng ty TNHH Xun Lc Thx
21Cng ty TNHH Pht trin cng ngh Vin thng v thng tin Phng Nhx
22Cng ty TNHH GSM Vit Nam.x
Cp ca cc n v ny c xy dng da trn cc tiu chun quc t IEC, cc tiu chun ca M v Hn Quc, tun theo tiu chun Ngnh TCN 68-132: 1998 Cp thng tin kim loi dng cho mng in thoi ni ht Yu cu k thut.
Ngoi cc n v ny, hin nay trn th trng c rt nhiu n v khc sn xut cp in thoi. Tuy nhin, do cha c tiu chun cp vo nh thu bao p dng thng nht trong nn gy kh khn cho c nh sn xut cp v cc doanh nghip Vin thng trong vic la chn, mua sm cp vo nh thu bao cho n v mnh.
Di y xin gii thiu ch tiu k thut ca cp vo nh thu bao ca mt s n v sn xut trong nc v ngoi nc.
a. Dy thu bao do cng ty c phn Vt liu bu in sn xut
Dy dn c lm t ng sch cao c ng knh n 0,5 mm; 0,65 mm hoc nhiu si 7 x 0,19 mm; 9 x 0,19 mm; 11 x 0,19 mm; 13 x 0,19 mm; 18 x 0,19 mm.
Dy dn c cch in bng HDPE hoc PE xp - c
V PVC mu en
Dy treo l loi dy thp n 1,2 mm hoc dy thp bn nhiu si 7 x 0,4 mm.
Ch tiu inn vKch thc dy dn (mm)
0,5
7x 0,190,6
9x 0,190,65
11x 0,190,7
13x 0,190,8
18x 0,19
in tr dy dn ti 200 C/km< 93,5
< 68< 56,5< 48< 36,5
in tr cch inM/km> 10.000
Mc mt cn bng in tr%< 2
in dung cng tc ti 1 kHznF/km< 54
Suy hao ti 1 kHzdB/km< 1,43< 1,19< 1,12< 0,94< 0,84
bn in mi trong 1 phtkV> 1,5
b. Sn phm ca cng ty TUCOVINA
Dy dn c lm t ng sch cao c ng knh n 0,5 mm; hoc nhiu si 9 x 0,20 mm; 11 x 0,18 mm;
Dy dn c cch in bng HDPE hoc PE xp - c
V PVC mu en
Dy treo l loi dy thp n 1,2 mm hoc dy thp bn nhiu si 7 x 0,4 mm.
Ch tiu inn vKch thc dy dn (mm)
0,5
11 x 0,18
9 x 0,2
in tr dy dn ti 200 C/km< 88,7
< 61,5
in tr cch inM/km> 10.000
Mc mt cn bng in tr%< 1,5
in dung cng tc ti 1 kHznF/km< 55
Suy hao ti 1 kHzdB/km< 1,44< 1,2
c. Sn phm cp vo nh thu bao ca cng ty General Cable
* Cp vo nh thu bao chn ngm c bc 2 ln v
- Dy dn c lm t ng c c mm.
- Cch in bng polyethylene mt cao.
- M mu:i sTipRing
1Trng/lamLam
2Trng/camCam
3Trng/lcLc
4Trng/nuNu
5Trng/xmXm
6Lam/
- S dng hp cht in y cho li cp v cp
- Lp v trong: polyethylene mt thp tuyn tnh
- Mn che chn: bng thp bc ng c gp np dy 5 mil
- Dy x v: di lp v ngoi cng
- Lp v ngoi cng: polyethylene mt thp tuyn tnh
S i/c dy (AWG)Trng lng/1000ftng knh ngoi danh nh, inchChiu di ch to ft
2/22570,322500
2/22570,325000
3/22650,341000
3/22650,342500
3/22650,345000
6/22930,41000
6/22930,42500
6/22930,45000
3/24550,312500
3/24550,312500
6/24740,362500
6/24740,365000
- Ch tiu v in
22 AWG24 AWG
in tr dy dn (/mile)91144
Mc mt cn bng in tr5 %5 %
in dung cng tc ti 1 kHz83 7 nF/mile
Mt cn bng in dung ti 1 kHz
i - i
- i - t80 pF/1000 ft
8000 pF/1000 ft
Suy hao (dB/1000ft) ti
150 kHz
772 kHz2,1
4,62,65
5,8
Suy hao xuyn m u xa ti 150 kHz (dB/1000ft)6363
Suy hao xuyn m u gn ti 772 kHz (dB/1000 ft)4444
bn in mi (kV DC)
Dy dn - dy dn
Dy dn - mn che5
204
20
3. Cch thc xy dng tiu chunD tho TCVN c xy dng qua 2 giai on:
3.1. Giai on 1: Nghin cu xy dng d tho tiu chun (trong khun kh ti nghin cu khoa hc cp B m s 120-08-KHKT-TC NGHIN CU XY DNG TIU CHUN CP VO NH THU BAO (CP SI NG) do Vin KHKT Bu in thc hin nm 2008.a) Phn tch la chn ti liu tham chiu xy dng tiu chun:
Nghin cu cc ti liu tiu chun quc t cho thy:- Cc tiu chun IEC l cc tiu chun ph hp xy dng tiu chun cp si ng vo nh thu bao, do y l cc tiu chun c nhiu quc gia chp thun p dng.
- Cc tiu chun ca M, Singapore, Palestin l cc tiu chun i vo mt s loi cp c th, khng mang tnh bao qut nh cc tiu chun IEC. Tuy nhin, cc tiu chun ny li cung cp cc thng tin rt chi tit v cu trc, ch tiu k thut khc. y l ngun tham kho thm rt c ch khi xy dng d tho tiu chun cp ny.
Nhm ch tr d tho tiu chun chn tiu chun IEC lm ti liu tham chiu chnh bao gm:
IEC 62255-4: Multicore and symmetrical pair/quad cables for broadband digital communications (high bit rate digital access telecommunication networks)- Outside plant cables - Part 4: Aerial drop cables Sectional specification
Tiu chun ny bao gm cc yu cu v in kh, c l v bn mi trng i vi cp thu bao treo c hoc khng c mn che kim loi vi lp cch in c hoc xp, lp v c do dai cao. Cc cp ny khng qu 6 i.
Tiu chun ny l c s xy dng cc yu cu k thut i vi cp vo nh thu bao loi treo.
IEC 62255-5: Multicore and symmetrical pair/quad cables for broadband digital communications (high bit rate digital access telecommunication networks)- Outside plant cables - Part 5: Filled drop cables Sectional specification
Tiu chun ny bao gm cc ch tiu k thut i vi cp c nhi c mn chn kim loi ngoi li cp, 1 v nha c do dai cao, cc li si ng, v lp cch in c hoc dng xp. Cp ny thng dng chn trc tip.
Tiu chun ny l c s xy dng yu cu k thut i vi cp vo nh thu bao loi chn ngm.
i vi cp c li l loi dy mm nhiu si, qua nghin cu cho thy hin nay s dng ph bin mt s cc li si 0,18 ; 0,19 v 0,20 mm. Nhm ch tr a ra cc kch thc dy dn mm nhiu si tng ng vi kch thc ca dy dn c vi ng knh si trong dy mm nhiu si l 0,18 ; 0,19 v 0,20 mm. Vic la chn cc thng s c trnh by chi tit di y.
IEC 60708: 2005 Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath
b) La chn cc yu cu k thut cho cp si ng vo nh thu bao
Trc ht xem xt cc yu t c nh hng n mng ngoi vi ni chung v cp ng ni ring. Cp phi c cc thuc tnh in ph hp truyn ti tn hiu. N phi c kh nng n nh hp l trong cc iu kin thi tit khc nhau, di tc ng ca cc loi nhiu. Di y s lit k cc yu cu c v c hc v in kh.
(1) in tr cch in
in tr cch in thp gy ra suy hao truyn dn ln, xuyn m v nhiu. Do cn phi s dng vt liu c sut in tr ln lm vt liu cch in dy dn.
(2) bn in mi
Mng ngoi vi ni chung v cp in thoi ni ring phi chu tc ng ca st v tip xc vi ng in lc. Do cp phi c bn in mi cao bo v bn thn cc cng trnh ngoi vi cng nh cc nhn vin bo dng v thu bao khi cc nguy him.
(3) in tr dy dn
Khi ng dy kt ni ti thit b chuyn mch, in tr dy dn phi nh cho php thit b hot ng tt v gim thiu suy hao truyn dn.
(4) Suy hao truyn dn
Suy hao truyn dn phi cng nh cng tt. Vic xc nh ga tr cho php ti a da trn cht lng truyn dn v tnh kinh t.
(5) Xuyn m
Xuyn m gia cc mch trong cp phi cng nh cng tt. gim thiu xuyn m, phi duy tr s cn bng in v mn che chn gia cc mch.
Cc dy dn cp phi c xon thnh tng i hoc quad t c s cn bng tt nht gia cc mch vi t.
(6) Cc yu cu v c hc
Cp in thoi thng phi chu nh hng ca thi tit nh bo, lc, tuyt, s thay i nhit Do cp phi c bn c hc tt m bo khng b gy, t hay lm suy gim kh nng truyn tn hiu.
Khi cp c lp t di t, n phi chu cc tc ng thng xuyn ca cc phng tin i li. Do , i vi cp chn ngm, cc yu cu v c hc ca cp phi cao hn so vi cp treo.
Vi cc yu cu nh trn, sau khi nghin cu cc tiu chun nhm ch tr d tho tiu chun chn lc cc yu cu i vi cp vo nh thu bao nh sau:
CU TO V KCH THC CP
- Dy dn
- Cch in ca dy dn
- Kt cu cp
- Hp cht in y li cp (tu chn)
- Hp cht in y cho cp (tu chn)
- Lp v bn trong (tu chn)
- Mn che chn li cp (tu chn)
- Lp v bn ngoi
- Dy x v (tu chn)
- Bng nhn dng
- Quy nh v bao gi, vn chuyn
YU CU V C HC
- Dy dn
- Cch in
- V cp
- Dy treo cp
YU CU V N NH NHIT V BN MI TRNG
- Cch in ca dy dn
- V cp
- Cc yu cu v mi trng khc
CC YU CU V IN
- in tr dy dn
- Mc mt cn bng in tr
- bn in mi
- in tr cch in
- in dung cng tc
- in dung khng cn bng gia cc i dy
- in dung khng cn bng gia i dy vi t
YU CU V TRUYN DN
- Suy hao
- Xuyn m u xa
- Xuyn m u gn
- Tr khng c tnh
Bn d tho tiu chun bao gm cc ni dung sau:
1. PHM VI P DNG
2. NH NGHA, THUT NG
3. PHN LOI CP
4. YU CU I VI CP VO NH THU BAO LOI TREO
4.1 CU TO CP
4.2 YU CU V C HC
4.3 YU CU V N NH NHIT V BN MI TRNG
4.4 YU CU V IN
4.5 YU CU V TRUYN DN
5. YU CU K THUT I VI CP SI NG VO NH THU BAO TREO LOI CHN NGM
5.1 CU TO CP
5.2 YU CU V C HC
5.3 YU CU V N NH NHIT V BN MI TRNG
5.4 YU CU V IN
5.5 YU CU V TRUYN DN
6. CC BI O NH GI CP SI NG VO NH THU BAO
6.1 O CC THNG S C L
6.2 O CC THNG S V N NH NHIT V BN MI TRNG
6.3 O CC THNG S IN
6.4 O CC THNG S TRUYN DN
TI LIU THAM KHO
3.2. Giai on 2: Nghin cu, hon chnh d tho tiu chun (trong khun kh ti nghin cu khoa hc cp B m s 107-10-KHKT-TC Nghin cu b sung v hon chnh cc tiu chun v cp v cng, b cp do Vin Khoa hc K thut Bu in ch tr nm 2010.Cc ni dung sa i, b sung c trnh by trong bng tham chiu di y:
Mc cNi dung tiu chun theo kt qu ti m s 120-08-KHKT-TC Mc miNi dung d tho
tiu chun miChi tit cc vn sa i b sungTi liu vin dn
Cp vo nh thu bao (Cp si ng)Cp ng vo nh thu bao
1Phm vi p dng1Phm vi p dngGi nguyn
2Ti liu vin dn2Ti liu vin dnGi nguyn
3nh ngha, thut ng3Thut ng nh ngha thun tin cho vic theo di, ng thi b cc li d tho cho ph hp, nhm ch tr kt hp Phn 3 Thut ng, nh ngha v Phn 4 Phn loi cp trong d tho c thnh mc 3 Thut ng, nh ngha.
4Phn loi cp
5Yu cu k thut chung i vi cp vo si ng nh thu bao loi treo4Yu cu k thut chung i vi cp si ng vo nh thu baoTrong d tho tiu chun c, cp si ng c chia thnh nhm cp treo v cp chn ngm, nhm thc hin ti nhn thy, hu ht cc ch tiu k thut ca 2 nhm ny ging nhau, chnh v th thng nht gp chung ch tiu k thut ca hai nhm cp ny, tr mt s trng hp sai khc s c ghi r trong tng ch tiu.
4.1Cu to cp
5.1.1Dy dn4.1.1Dy dnBin son li
6.1.1Dy dn
5.1.2Cch in ca dy dn4.1.2Cch in ca dy dnBin son li
6.1.2Cch in ca dy dn
5.1.3Kt cu cp 4.1.3Kt cu cp Bin son li
6.1.3Kt cu cp
5.1.4Hp cht in y li cp (ty chn)4.1.4Hp cht in y li cpBin son li
6.1.4Hp cht in y li cp
5.1.5Hp cht in y cho cp (ty chn)4.1.5Hp cht in y cho cpBin son li
6.1.5Hp cht in y cho cp
5.1.6Lp v bn trong (ty chn)4.1.6Lp v bn trong (ty chn)Bin son li
6.1.6Lp v bn trong (ty chn)
5.1.7Mn che tnh in4.1.7Mn che tnh inBin son li
6.1.7Mn che tnh in
5.1.8Lp v bn ngoi4.1.8Lp v bn ngoiBin son li
6.1.8Lp v bn ngoi
5.1.9Dy x v4.1.9Dy x v (ty chn)Bin son li
6.1.9Dy x v (ty chn)
5.1.10Nhn dng4.1.10Nhn dng Bin son li
6.1.10Nhn dng
5.1.11Quy nh v bao gi4.1.11Quy nh v bao giBin son li
6.1.11Quy nh v bao gi
4.2Yu cu v c hcBin son li
5.2.1Dy dn4.2.1Dy dn
6.2.1Dy dn
5.2.2Cch in4.2.2Cch in
6.2.2Cch in
5.2.3V cp4.2.3V cp
6.2.3V cp
5.2.4Dy treo cp4.2.4Dy treo cp
6.2.4 bm dnh ca bng nhm4.2.5 bm dnh ca bng nhm
6.2.5 bm cht ca v4.2.6 bm cht ca v
6.2.6 nguyn vn ca v cp4.2.7 nguyn vn ca v cp
4.3Yu cu v n nh nhit v bn mi trngBin son li
5.3.1Cch in ca dy dn4.3.1Cch in ca dy dn
6.3.1Cch in ca dy dn
5.3.2V cp4.3.2V cp
6.3.2V cp
5.3.3Cc yu cu khc v mi trng4.3.3Cc yu cu khc v mi trng
6.3.3Cc yu cu khc v mi trng
4.4Yu cu v inBin son li
5.4.1in tr dy dn4.4.1in tr dy dn
6.4.1in tr dy dn
5.4.2Mc mt cn bng in tr4.4.2Mc mt cn bng in tr
6.4.2Mc mt cn bng in tr
5.4.3 bn in mi4.4.3 bn in mi
6.4.3 bn in mi
5.4.4in tr cch in4.4.4in tr cch in
6.4.4in tr cch in
5.4.5in dung cng tc4.4.5in dung cng tc
6.4.5in dung cng tc
5.4.6in dung khng cn bng gia cc i dy4.4.6in dung khng cn bng gia cc i dy
6.4.6in dung khng cn bng gia cc i dy
5.4.7in dung khng cn bng gia i dy vi t4.4.7in dung khng cn bng gia i dy vi t
6.4.7in dung khng cn bng gia i dy vi t
6.4.8in tr ca mn che tnh in4.4.8in tr ca mn che tnh in
4.5Yu cu v truyn dnBin son li
5.5.1Suy hao4.5.1Suy hao
6.5.1Suy hao
5.5.2Xuyn m u xa4.5.2Xuyn m u xa
6.5.2Xuyn m u xa
5.5.3Xuyn m u gn4.5.3Xuyn m u gn
6.5.3Xuyn m u gn
5.5.4Tr khng c tnh4.5.4Tr khng c tnh
6.5.4Tr khng c tnh
Cha c trong d tho tiu chun c4.6Cc ch tiu i vi cp dng cho dch v xDSLB sung mi
4.6.1 in tr vng mt chiu (Rv) v c ly thng tinB sung mi 3.4.1 TCVN 8238:2009
4.6.2Suy hao tng cng sut xuyn mB sung mi 3.4.2 TCVN 8238:2009
4.6.3Suy hao bin i dc (Ad)B sung mi 3.4.3 TCVN 8238:2009
4.6.4 Suy hao phn x (Ap)B sung mi 3.4.4 TCVN 8238:2009
7Cc bi o nh gi cp si ng vo nh thu baoPH LC ACc bi o nh gi cp si ng vo nh thu baoNhm thc hin ti gi nguyn cc bi o trong d tho tiu chun c, do cc bi o vn cn ph hp v khng cn cp nht g thm
PAGE 21