BT8376EPF datasheet(90/323 Pages) CONEXANT

90 / 323 page

2.0 Circuit Description

Bt8370/8375/8376

2.8 Transmitter

Fully Integrated T1/E1 Framer and Line Interface

2-62

Conexant

N8370DSE

Automatic generation of Yellow Alarm(YB2) is controlled by AUTO_YEL,

RLOF, and RLOF_INTEG. If AUTO_YEL is set, Yellow Alarm is generated

during a Receive Loss of Frame alignment (RLOF = 1). Optionally, RLOF

integration can be enabled by setting RLOF_INTEG. In this case, both RLOF

indication and Yellow Alarm/RAI generation are delayed for approximately 2.5

seconds if a continuous out of frame condition exists. Yellow Alarm/RAI

generation continues for at least 1 second after RLOF clears. Refer to Table 2-13.

In T1 ESF framing mode, Multiframe Yellow Alarm or RAI is transmitted

using BOP Codeword Transmitter [TBOP; addr 0A1] and does not depend on

INS_MYEL. Transmitting Yellow Alarm/RAI toward the line can be done upon

receiving Receive Loss of Frame. T1 multiframe Yellow Alarm must be generated

by configuring TDL1 to transmit an all-0s BOP codeword. Optionally, RLOF

integration can be enabled by setting RLOF_INTEG. In this case, both RLOF

indication and Yellow Alarm/RAI generation are delayed for approximately

2.5 seconds if a continuous out of frame condition exists. Yellow Alarm/RAI

generation continues for at least 1 second after RLOF clears. RLOF_INTEG does

not meet the requirements of TR62411. To meet the requirements of TR62411,

“Conditions Causing the Initiation of Carrier Failure Alarms,” the Receive Loss

of Frame condition reported by FRED (addr 049) must be integrated before

initiating Yellow Alarm Transmission. This can be accomplished in software by

integrating FRED during an RLOF Interrupt (ISR7; addr 004), with

RLOF_INTEG bit cleared.

In E1 CAS framing modes, Multiframe Yellow Alarm is inserted into the

transmit stream to alert far-end equipment that local received multiframe

alignment is not recovered. E1 Multiframe Yellow Alarm is transmitted by setting

the Y bit in time slot 16, frame 0.

Transmission of Multiframe Yellow Alarm is controlled by the register bits

listed in Table 2-14:

Table 2-13. Multiframe Yellow Alarm Generation

Line Rate

Multiframe Yellow Alarm Action

Mode

Facilitates Yellow Alarm Action (requires

programming TDL1)

Set Y bit TS16 in frame 0 to 1

Y16

Table 2-14. Multiframe Yellow Alarm Register Bits

Bit Name

INS_MYEL

[TFRM; addr 072]

TMYEL

[TALM; addr 075]

AUTO_MYEL

[TALM; addr 075]

SRED

[ALM3; addr 049]

BT8376EPF Datasheet(PDF) 90 Page - Synaptics Incorporated.

BT8376EPF Datasheet(HTML) 90 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