BT8376EPF datasheet(89/323 Pages) CONEXANT

89 / 323 page

Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.8 Transmitter

N8370DSE

Conexant

2-61

Yellow Alarm Generation

Yellow Alarm, also referred to as RAI (Remote Alarm Indication), is a bit pattern

inserted into the transmit stream to alert far-end equipment that the local receiver

cannot recover data. Yellow Alarm/RAI is typically transmitted during Receive

Loss of Frame and is defined differently depending upon the transmit frame

format configured [TFRAME; addr 070]. Table 2-11 describes the Yellow

Alarm/RAI action taken for each frame format.

Transmission of Yellow Alarm(YB2) is controlled by the register bits listed in

Table 2-12:

The insertion of Yellow Alarm(YB2) into the transmit stream is controlled by

INS_YEL. Yellow Alarm(YB2) is inserted only when INS_YEL is set.

Otherwise, these bit positions are supplied by data from TPCMI. Yellow

Alarm(YB2) generation can be done manually or automatically.

Manual generation of Yellow Alarm(YB2) is controlled by TYEL. Setting this

bit immediately and unconditionally overwrites the Yellow Alarm signal bit(s) in

the transmitted data stream with the appropriate pattern.

Table 2-11. Yellow Alarm Generation

Frame Format

Yellow Alarm Location

Mode

Bit 2 of every time slot set to 0

YB2

ESF(1)

Bit 2 of every time slot set to 0

YB2

SLC-96

Bit 2 of every time slot set to 0

BY2

SF/JYEL

F-bit 12 of every superframe set to 1

T1DM

Y bit of the sync byte set to 0

Y24

A bit of TS0 set to 1

NOTE(S):

(1) Yellow Alarm/RAI for T1-ESF framing is defined as a BOP priority

codeword in the FDL channel. This is called T1 Multiframe Yellow Alarm

in 8370. T1-ESF Multiframe Yellow Alarm/RAI(YF) is not transmitted

using the procedure described below. Instead, T1- ESF Multiframe Yellow

Alarm/RAI(YF) is generated by configuring DL1 to continuously transmit

an all 0s BOP priority codeword. Refer to the Transmit Data Links section

under TBOP Transmitter.

Table 2-12. Yellow Alarm Register Bits

Bit Name

INS_YEL

[TFRM; addr 072]

TYEL

[TALM; addr 075]

AUTO_YEL

[TALM; addr 075]

RLOF

[ALM1; addr 047]

RLOF_INTEG

[RALM; addr 045]

BT8376EPF Datasheet(PDF) 89 Page - Synaptics Incorporated.

BT8376EPF Datasheet(HTML) 89 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