BT8376EPF datasheet(47/323 Pages) CONEXANT

47 / 323 page

Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.4 Receiver

N8370DSE

Conexant

2-19

2.4.5.3 Analog Loss of

Signal

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

µs. RALOS real-time status is available in ALM1; RALOS interrupt is

available in ISR7.

2.4.5.4 Alarm Indication

Signal

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.

2.4.5.5 Yellow Alarm

The criteria for Yellow Alarm (YEL) is described in Table 3-13, Receive Yellow

Alarm Set/Clear Criteria. YEL real-time status is available in ALM1; YEL

interrupt is available in ISR7.

2.4.5.6 Multiframe YEL

The criteria for Multiframe Yellow Alarm is described in Table 3-13, Receive

Yellow Alarm Set/Clear Criteria. MYEL real-time status is available in ALM1;

MYEL interrupt is available in ISR7.

2.4.5.7 Severely Errored

Frame

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.

2.4.5.8 Change of

Frame

Alignment

Each COFA increments a 2-bit counter [COFA; addr 05A]. An interrupt is

available in ISR4 to indicate that the COFA counter overflowed.

2.4.5.9 Receive

Multiframe AIS

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].

BT8376EPF Datasheet(PDF) 47 Page - Synaptics Incorporated.

BT8376EPF Datasheet(HTML) 47 Page - Synaptics Incorporated.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL