BT8376EPF datasheet(188/323 Pages) CONEXANT

188 / 323 page

Bt8370/8375/8376

3.12 Transmitter Registers

Fully Integrated T1/E1 Framer and Line Interface

3-70

Conexant

N8370DSE

Table 3-18. Criteria for T1 Loss/Recovery of Transmit Frame Alignment

Mode

Description

FT Only

Terminal Frame Alignment is recovered when

One, and only 1 valid Ft pattern (1010) is found in 12 alternate F-bit locations (3 ms), when F-bits are

separated by 193 bits.

Transmit Loss of Frame (TLOF) alignment is declared when

Number of Ft bit errors detected meets selected loss of frame criteria [TLOFA–TLOFC; addr 071].

Superframe alignment is recovered when

•

Terminal frame alignment is recovered, identifying Ft bits.

•

Depends on SF submode.

With JYEL:

If SF pattern (00111x) found in Fs bits.

If no JYEL:

SF pattern (001110) found in Fs bits.

Fs errors do not cause Transmit Loss of Frame (TLOF) alignment.

Transmit loss of frame alignment (TLOF) declared when

The number of Ft bit errors detected meets the selected reframe criteria [TLOFA–TLOFC; addr 071].

NOTE(S):

Fs bit multiframe errors are reported in TMERR [ISR0; addr 00B], but do not cause a loss of

transmit frame alignment.

SLC

Superframe alignment is recovered when

•

Terminal frame alignment is recovered, identifying Ft bits.

•

The SLC pattern (refer to Table A-3,

SLC-96 Fs Bit Contents) is found in 16 of 32 Fs bits according to

Bellcore TR-TSY-000008.

Fs errors do not cause Transmit Loss of Frame (TLOF) alignment.

Transmit loss of frame alignment (TLOF) declared when

The number of Ft bit errors detected meets the selected reframe criteria [TLOFA–TLOFC; addr 071].

NOTE(S):

Fs bit multiframe errors are reported in TMERR [ISR0; addr 00B], but do not cause a loss of

transmit frame alignment.

ESF

Extended superframe alignment is recovered when

A valid FPS candidate is located (001011). Candidate bits are separated by 772 digits and are received

without pattern errors.

•

If only 1 valid FPS candidate and

No CRC mode—align to FPS, regardless of CRC6 comparison.

Mimic CRC mode—align to FPS, regardless of CRC6 comparison.

Force CRC mode—align to FPS, only if CRC6 is correct.

•

If two or more valid FPS candidates and:

No CRC mode—do not align (INVALID status).

Mimic CRC mode—align to first FPS with correct CRC6.

Force CRC mode—align to first FPS with correct CRC6.

Transmit loss of frame alignment (TLOF) declared when

The number of FPS pattern errors detected meets the selected loss of frame criteria

[TLOFA–TLOFC; addr 071].

BT8376EPF Datasheet(PDF) 188 Page - Synaptics Incorporated.

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