參數(shù)資料
型號： IDT82V2088BB
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 20/78頁
文件大?。?/td> 0K
描述： IC LIU T1/J1/E1 8CH 208-BGA
標準包裝： 10
類型： 線路接口裝置（LIU）
規(guī)程： E1
電源電壓： 3.13 V ~ 3.47 V
安裝類型： 表面貼裝
封裝/外殼： 208-BGA
供應(yīng)商設(shè)備封裝： 208-PBGA（17x17）
包裝： 托盤
其它名稱： 82V2088BB
27
INDUSTRIAL
TEMPERATURE RANGES
OCTAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
3.5.2
AIS DETECTION
The Alarm Indication Signal can be detected by the IDT82V2088 when
the Clock&Data Recovery unit is enabled. The status of AIS detection is
reflected in the AIS_S bit (STAT0, 14H...). In T1/J1 applications, the criteria
for declaring/clearing AIS detection are in compliance with the ANSI
T1.231. In E1 applications, the criteria for declaring/clearing AIS detection
comply with the ITU G.775 or the ETSI 300233, as selected by the LAC bit
(MAINT0, 0AH...). Table-19 summarizes different criteria for AIS detection
Declaring/Clearing.
Table-18 LOS Declare and Clear Criteria for Long Haul Mode
Control bit
LOS declare threshold
LOS clear threshold
Note
T1E1
LAC
LOS[4:0]
Q (dB)
1=T1/J1
0
T1.231
00000
00001
…
10001
…
10101
10110-11111
-4
-6
…
-38
…
-46
-48
Level < Q
N=175 bits
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeroes
1
-
00000
…
00110
-4
-16
Level < Q
N=1544 bits
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeroes
I.431 Level detect range is -18 to -30 dB.
I.431 00111
…
01101
-18
…
-30
-
01110
…
10001
…
10101
10110-11111
-32
…
-38
…
-46
-48
0=E1
0
-
00000
…
00010
-4
…
-8
Level < Q
N=32 bits
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeroes
G.775 Level detect range is -9 to -35 dB.
G.775
00011
…
10000
-10
…
-36
-
10001
…
10101(default)
10110-11111
-38
…
-46
-48
1
-
00000
-4
Level < Q
N=2048 bits
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeroes
I.431 Level detect range is -6 to -20 dB.
I.431/
ETSI
00001
…
01000
-6
…
-20
-
01001
…
10101(default)
10110-11111
-22
…
-46
-48
Table-19 AIS Condition
ITU G.775 for E1
(LAC bit is set to ‘0’ by default)
ETSI 300233 for E1
(LAC bit is set to ‘1’)
ANSI T1.231 for T1/J1
AIS
detected
Less than 3 zeros contained in each of two consecutive
512-bit streams are received
Less than 3 zeros contained in a 512-bit
stream are received
Less than 9 zeros contained in an 8192-bit stream
(a ones density of 99.9% over a period of 5.3ms)
AIS
cleared
3 or more zeros contained in each of two consecutive
512-bit streams are received
3 or more zeros contained in a 512-bit
stream are received
9 or more zeros contained in an 8192-bit stream
are received
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