DS26324 Datasheet, PDF (30/112 Pages) Maxim Integrated Products – 3.3V, 16-Channel, E1/T1/J1 Short-Haul Line Interface Unit

DS26324 3.3V, 16-Channel, E1/T1/J1, Short-Haul Line Interface Unit
5.5.6 AIS
Table 5-7 outlines the DS26324 AIS related specifications. Table 5-8 states the AIS functionality in the DS26324.
The registers related to the AIS detection are shown in Table 5-9.
Table 5-7. AIS Criteria T1.231, G.775, and ETSI 300 233 Specifications
CRITERIA
AIS
Detection
Criteria
AIS
Clearance
Criteria
ITU G.775 for E1
2 or fewer zeros in each of 2
consecutive 512-bit streams
received.
3 or more zeros in each of 2
consecutive 512-bit streams
received.
STANDARD
ETSI 300233 for E1
Less than 3 zeros detected in
512-bit period.
3 or more zeros in a 512 bits
received.
ANSI T1.231 for T1
Fewer than 9 zeros detected in
a 8192-bit period (a ones
density of 99.9% over a period
of 5.3ms) are received.
9 or more zeros detected in a
8192-bit period are received.
Table 5-8. AIS Detection and Reset Criteria
CRITERIA
AIS
Detection
Criteria
AIS
Clearance
Criteria
ITU G.775 for E1
2 or less zeros in each of 2
consecutive 512-bit streams
received.
3 or more zeros in each of 2
consecutive 512-bit streams
received.
STANDARD
ETSI 300233 for E1
Less than 3 zeros detected in
512-bit period.
3 or more zeros in 512 bits
received.
ANSI T1.231 for T1
Fewer than 9 zeros contained
in 8192 bits.
9 or more bits received in a
8192-bit stream.
Table 5-9. Registers Related to AIS Detection
REGISTER
ACRONYM POINTER
FUNCTIONALITY
LOS/AIS Criteria
LASCS
Section criteria for AIS (T1.231, G.775, ETSI 300233 for E1)
AIS Register
AIS
Set when AIS is detected.
AIS Enable Register
AIS Interrupt
AISIE
AISI
If reset interrupt due to AIS is not generated.
Latched if there is a change in AIS and the interrupt is
enabled.
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