BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 188
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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3.12 Transmitter Registers
Table 3-18. Criteria for T1 Loss/Recovery of Transmit Frame Alignment
3-70
FT Only
SF
SLC
ESF
Mode
Terminal Frame Alignment is recovered when
separated by 193 bits.
Transmit Loss of Frame (TLOF) alignment is declared when
Superframe alignment is recovered when
Fs errors do not cause Transmit Loss of Frame (TLOF) alignment.
Transmit loss of frame alignment (TLOF) declared when
NOTE(S):
transmit frame alignment.
Superframe alignment is recovered when
Fs errors do not cause Transmit Loss of Frame (TLOF) alignment.
Transmit loss of frame alignment (TLOF) declared when
NOTE(S):
transmit frame alignment.
Extended superframe alignment is recovered when
without pattern errors.
Transmit loss of frame alignment (TLOF) declared when
[TLOFA–TLOFC; addr 071].
One, and only 1 valid Ft pattern (1010) is found in 12 alternate F-bit locations (3 ms), when F-bits are
Number of Ft bit errors detected meets selected loss of frame criteria [TLOFA–TLOFC; addr 071].
With JYEL:
If SF pattern (00111x) found in Fs bits.
If no JYEL:
SF pattern (001110) found in Fs bits.
The number of Ft bit errors detected meets the selected reframe criteria [TLOFA–TLOFC; addr 071].
The number of Ft bit errors detected meets the selected reframe criteria [TLOFA–TLOFC; addr 071].
A valid FPS candidate is located (001011). Candidate bits are separated by 772 digits and are received
The number of FPS pattern errors detected meets the selected loss of frame criteria
•
•
•
•
•
•
Terminal frame alignment is recovered, identifying Ft bits.
Depends on SF submode.
Terminal frame alignment is recovered, identifying Ft bits.
The SLC pattern (refer to
Bellcore TR-TSY-000008.
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.
Fs bit multiframe errors are reported in TMERR [ISR0; addr 00B], but do not cause a loss of
Fs bit multiframe errors are reported in TMERR [ISR0; addr 00B], but do not cause a loss of
Table A-3, SLC-96 Fs Bit Contents
Conexant
Description
Fully Integrated T1/E1 Framer and Line Interface
) is found in 16 of 32 Fs bits according to
Bt8370/8375/8376
N8370DSE
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