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TP3410J Arkusz danych(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części TP3410J
Szczegółowy opis  TP3410 ISDN Basic Access Echo-Cancelling 2B1Q U Transceiver
Download  32 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

TP3410J Arkusz danych(HTML) 6 Page - National Semiconductor (TI)

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Functional Description (Continued)
Framing
12x(2BaD)
Overhead Bits (M1–M6)
Quat Positions
1 – 9
10 – 117
118s
118m
119s
119m
120s
120m
Bit Positions
1 – 18
19 – 234
235
236
237
238
239
240
Superframe
Basic Frame
Sync Word
2BaDM1
M2
M3
M4
M5
M6
1
1
ISW
2BaD
eoca1
eoca2
eoca3
act
1
1
2SW
2BaD
eocdm
eoci1
eoci2
dea
1
febe
3SW
2BaD
eoci3
eoci4
eoci5
1
crc1
crc2
4SW
2BaD
eoci6
eoci7
eoci8
1
crc3
crc4
5SW
2BaD
eoca1
eoca2
eoca3
1
crc5
crc6
6SW
2BaD
eocdm
eoci1
eoci2
1
crc7
crc8
7SW
2BaD
eoci3
eoci4
eoci5
uoa
crc9
crc10
8SW
2BaD
eoci6
eoci7
eoci8
aib
crc11
crc12
2 3
1
ISW
(a) Network
x NT
Framing
12x(2BaD)
Overhead Bits (M1–M6)
Quat Positions
1 – 9
10 – 117
118s
118m
119s
119m
120s
120m
Bit Positions
1 – 18
19 – 234
235
236
237
238
239
240
Superframe
Basic Frame
Sync Word
2BaDM1
M2
M3
M4
M5
M6
1
1
ISW
2BaD
eoca1
eoca2
eoca3
act
1
1
2SW
2BaD
eocdm
eoci1
eoci2
ps1
1
febe
3SW
2BaD
eoci3
eoci4
eoci5
ps2
crc1
crc2
4SW
2BaD
eoci6
eoci7
eoci8
ntm
crc3
crc4
5SW
2BaD
eoca1
eoca2
eoca3
cso
crc5
crc6
6SW
2BaD
eocdm
eoci1
eoci2
1
crc7
crc8
7SW
2BaD
eoci3
eoci4
eoci5
1
crc9
crc10
8SW
2BaD
eoci6
eoci7
eoci8
1
crc11
crc12
2 3
1
ISW
(b) NT
x Network
Note
8 c 15 ms Basic Frames e 12 msSuperframe NT-to-Network superframe is offset from Network-to-NT superframe by 60g2 quats (about 075 ms) All
bits other than the Sync Word are scrambled
Symbols
Abbreviations
act
e
start-up bit (e 1 during start-up)
aib
e
alarm indication bit (e 0 to indicate interrup-
tion)
crc
e
cyclic redundacy check covers 2BaD a M4
1
e
most significant bit
2
e
next significant bit etc
cso
e
cold-start-only bit (e 1 to indicate cold-start-
only)
dea
e
turn off bit (e 0 to announce turn off)
eoc
e
embedded operations channel
a
e
address bits
dm e datamessage indicator (0
e
data
1 e message)
i
e
information (data or message)
febe
e
far end block error bit (e 0 for errored super-
frame)
ntm
e
NT in test mode bit (e 0 to indicate test mode)
ps1 ps2 e power status bits (e 0 to indicate power prob-
lems)
Quat
e
pair of bits forming quaternary symbol
s
e
sign bit (first in quat)
m e magnitude bit (second in quat)
sai
e
S-activation-indication bit (e 1 for ST activity)
uoa
e
U-only-activation bit (e 1 to activate ST)
‘‘1’’
e
reserved bit for future standard (e 1)
‘‘1 ’’
e
network indicator bit (e 1 reserved for network
use)
2BaD
e
user data bits 19 – 234 in frame
M
e
M-channel bits 235 – 240 in frame
SWISW e synchronization wordinverted synchronization
word bits 1 – 18 in frame
TABLE I 2B1Q Superframe Format and Overhead Bit Assignments
6


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