BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 47
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BT8375
Manufacturer Part Number
BT8375
Description
single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
Manufacturer
CONEXANT [Conexant Systems, Inc]
Datasheet
1.BT8375.pdf
(323 pages)
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Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
2.4.5.7 Severely Errored
N8370DSE
2.4.5.4 Alarm Indication
2.4.5.6 Multiframe YEL
2.4.5.3 Analog Loss of
2.4.5.5 Yellow Alarm
2.4.5.8 Change of
2.4.5.9 Receive
Multiframe AIS
Alignment
Signal
Signal
Frame
Frame
Receive Analog Loss of Signal (RALOS) is declared in analog receive mode,
[RDIGI = 0; addr 020], when RTIP/RRING input signal amplitude is less than the
programmed (VGA_MAX) threshold. In the digital receive mode, RDIGI = 1,
RALOS is declared when the Receive Clock Input (RCKI) remains low for
125 s. RALOS real-time status is available in ALM1; RALOS interrupt is
available in ISR7.
If the line rate is T1 [T1/E1N; addr 001], the criteria for Receive Alarm Indication
Signal (RAIS) is the reception of 4 or fewer 0s in a period of 3 ms (4632 bits), and
the assertion of RLOF. If the line rate is E1, RAIS is set when 2 consecutive
double frames each contain 2 or fewer 0s out of 512 bits and FAS alignment is
lost [FRED; addr 049]. RAIS real-time status is available in ALM1; RAIS
interrupt is available in ISR7.
The criteria for Yellow Alarm (YEL) is described in
Alarm Set/Clear
interrupt is available in ISR7.
The criteria for Multiframe Yellow Alarm is described in
Yellow Alarm Set/Clear
MYEL interrupt is available in ISR7.
A SEF is reported when the receive signal does not meet the requirements of
ANSI T1.231. SEF real-time status is available in ALM3. A 2-bit counter is also
available [SEF; addr 05A]. An interrupt is available in ISR4 to indicate that the
SEF counter overflowed.
Each COFA increments a 2-bit counter [COFA; addr 05A]. An interrupt is
available in ISR4 to indicate that the COFA counter overflowed.
Receive Multiframe AIS (RMAIS) is reported when the receive TS16 signal
contains 3 or fewer 0s out of 128 bits in each multiframe over 2 consecutive
multiframes according to the requirements of ITU–T Recommendation G.775.
RMAIS is checked only in E1 CAS mode. RMAIS real-time status is available in
ALM3 [addr 049].
Criteria. YEL real-time status is available in ALM1; YEL
Conexant
Criteria. MYEL real-time status is available in ALM1;
Table 3-13, Receive Yellow
Table 3-13, Receive
2.0 Circuit Description
2.4 Receiver
2-19
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