中国铁塔笔试知识点之--（通信类）现代交换复习知识点_2025春招题库汇总_国企题库_中国铁塔_2-中国铁塔完整版知识点笔记（仅需看自己的专业）_2-中国铁塔完整版知识点笔记资料_通信类

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1
1892 11 3
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3 ATM
Circuit Switching CS
4
1 222
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VVVVViiiiirrrrrtttttuuuuuaaaaalllll CCCCCiiiiirrrrrcccccuuuuuiiiiittttt VVVCCC Datagram DG
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PCM
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S
CM
S S ( )
3
4 T
TST
T S S T
• TTSS55
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PPPCCCMMM000TTTSSS
7+512/2=263
S PCM0 PCM31
PCM31TS 1
5
2
1 Space Switch S
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S
2
Time Switch T T
3
5 T-S-T T PCM 512
T T S
8X8 PCM1 TTSS88 PPPCCCMMM777 TS31
TS15
6 T-S-T / HW 32 A HW1
TS5 B HW2 TS22 TTT---SSS---TTT A
B T SSS
T
T-S-T
T SS T
SMA1 SMB1
TTSS85 0 IIIIITTTTTSSSSS2222279999 IIITTTSSS111033 0 TTTSSS855
A AAA B BB
HW1 . . HW1'
58 AAA . . . . 558 BBB
333111 3311
2295 85 1130 85
CCCMMMAAA111 CMB1
TTTSSS222122
0
SMA2 IIIITTTTSSSS11110333 ITITSS22970 SMB2 TTSS2212
BB BBB A A
HW2 HW2'
2221 BBB 2221 A
31 31
1130 2 2297 1
CMC1 CMC2
1103 2212 2297 2221
CMA2 CMB2
TS29 CMA1 29
5 CMB2 29 22 CMC2 29 1 A B
HW1 TS5 SMA1 5
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ITS29 S TS29 SMB2 22 TS22
A B
B A ITS13 CMA2 13
22 CMB1 13 5 CMC1 13 2 B A
HW2 TS22 SMA2
22 ITS13 S ITS13 SMB1
5 TS5 B A
1
2
BORSCHT
3
4
N+1 N+m
5 BHCA
BHCA === +
ttt===aaa+++bbbNNN
t ; a ; b ( ); N
,,, BBHHCCAA
8 000...888555 0.29
333222mmmsss BBBHHHCCCAAA
ttttt=====00000.....8888855555,,,,, aaaaa=====00000.....2222299999,,,,, bbbbb=====3333322222mmmmmsssss ttt===aaa+++bbbNNN 0.85=0.29+ 0.032/3600 *N
N=63000 //hh
6
0”
1” 0” 1”
200ms 200ms
1” 0” 200ms
0” 1”
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0
1
200ms
1 1 1 0 0 0 0 1 1 1
1 1 1 1 0 0 0 0 1 1
0 0 0 1 0 0 0 0 0 0
0 0 0 0 0 0 0 1 0 0
200ms
200ms “1”
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“1” “0” “““000””” “1”
7 1
3.48
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2
DTMF PULSE
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8
10ms
10
11
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12 16 3.51
1 16 16 8 10
1 15 SCN
LM 0 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 1 1 0 1 0 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1
0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0
1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 1111 0000
000 000 000 000 000 111 000 111 000 000 000 000 000 000 000 000
11111 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 11111 00000
1
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No.7
ISDN
1 ISDN
ISDN IDN
-
2 ISDN
ISDN
ISDN
—
ATM
1. ATM
AAAAAsssssyyyyynnnnnccccchhhhhrrrrrooooonnnnnooooouuuuusssss TTTTTrrrrraaaaannnnnsssssfffffeeeeerrrrr MMMMMooooodddddeeeee AAATTTMMM
2. ATM
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3
4 VP VC
VP VPI VVVCCCIII
VC VPI VCI
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2 ATM
4.
GFC UNI VPI/VCI / PT
CLP HEC
5 ATM A B C D E F G H VPI/VCI
A
ATM
3 VP1/VC2 99 VVVPPP222///VVVCCC111111 VVVCCC
3 VP1/VC8 999 VVVPPP333///VVVCCC999 VVCC
3 VP7/VC3 5 VVVPPP444///VVVCCC333 VP
6 VP5/VC7 9 VVPP22//VVCC2211 VC
6 4*4 ATM
I4
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4
P340
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