IDT82V2044E Integrated Device Technology, IDT82V2044E Datasheet - Page 24

• Manufacturer Part Number: IDT82V2044E
• Description: 4 Channel T1/j1/e1 Short Haul Liu
• Manufacturer: Integrated Device Technology

QUAD CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
Table-14 LOS Declare and Clear Criteria, Adaptive Equalizer Enabled
3.5.2
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
Table-15 AIS Condition
detected
cleared
The Alarm Indication Signal can be detected by the IDT82V2044E 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
ETSI
Control bit
-
-
-
ITU G.775 for E1
00000
00001
…
01010
01011 - 11111
00000
…
00110
00111
01010
01011 - 11111
00000
…
00010
00011
…
01010
01011 - 11111
00000
00001
…
01010
01011 - 11111
LOS[4:0]
-4
-6
…
-24
Reserved
-16
-18
-24
Reserved
-4
…
-8
-10
…
-24
Reserved
-6
…
-24
Reserved
-4
-4
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’)
24
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, 0AH...).
Declaring/Clearing.
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeroes
Level > Q+ 4dB
M=128 bits
12.5% mark density
<100 consecutive zeroes
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeroes
Level > Q+ 4dB
M=32 bits
12.5% mark density
<16 consecutive zeroes
LOS clear threshold
Table-15
Less than 9 zeros contained in an 8192-bit stream
(a ones density of 99.9% over a period of 5.3ms)
9 or more zeros contained in an 8192-bit stream
are received
summarizes different criteria for AIS detection
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