82V2081PPG8 IDT, Integrated Device Technology Inc, 82V2081PPG8 Datasheet - Page 25

• Manufacturer Part Number: 82V2081PPG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2081PPG8

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

SINGLE CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
Table-18 LOS Declare and Clear Criteria for Long Haul Mode
3.6.2
the Clock & Data Recovery unit is enabled. The status of AIS detection is
reflected in the AIS_S bit (STAT0, 17H). In T1/J1 applications, the criteria
for declaring/clearing AIS detection are in compliance with the ANSI
Table-19 AIS Condition
detected
cleared
The Alarm Indication Signal can be detected by the IDT82V2081 when
1=T1/J1
AIS
AIS
T1E1
0=E1
AIS DETECTION
Less than 3 zeros contained in each of two consecutive
512-bit streams are received
3 or more zeros contained in each of two consecutive
512-bit streams are received
0
1
0
1
LAC
(LAC bit is set to ‘0’ by default)
T1.231
G.775
I.431/
I.431 00111
ETSI
Control bit
-
-
-
-
-
-
ITU G.775 for E1
00000
00001
…
10001
…
10101
10110-11111
00000
…
00110
…
01101
01110
…
10001
…
10101
10110-11111
00000
…
00010
00011
…
10000
10001
…
10101(default)
10110-11111
00000
00001
…
01000
01001
…
10101(default)
10110-11111
LOS[4:0]
-4
-6
…
-38
…
-46
-48
-16
-18
…
-30
-32
…
-38
…
-46
-48
-4
…
-8
-10
…
…
-6
…
-20
…
-4
-36
-38
-46
-48
-4
-22
-46
-48
Q (dB)
Level < Q
N=175 bits
Level < Q
N=1544 bits
Level < Q
N=32 bits
Level < Q
N=2048 bits
LOS declare threshold
Less than 3 zeros contained in a 512-bit
stream are received
3 or more zeros contained in a 512-bit
stream are received
(LAC bit is set to ‘1’)
25
ETSI 300233 for E1
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, 0DH).
Declaring/Clearing.
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeros
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeros
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeros
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeros
LOS clear threshold
Table-19
summarizes different criteria for AIS detection
Less than 9 zeros contained in an 8192-bit stream
(a ones density of 99.9% over a period of 5.3 ms)
9 or more zeros contained in an 8192-bit stream
are received
I.431 Level detect range is -18 to -30 dB
G.775 Level detect range is -9 to -35 dB
I.431 Level detect range is -6 to -20 dB
ANSI T1.231 for T1/J1
TEMPERATURE RANGES
Note
INDUSTRIAL