bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 90

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

2.0 Circuit Description
2.8 Transmitter
2-62
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. Multiframe Yellow Alarm Generation
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.
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.
listed in
Table 2-14. Multiframe Yellow Alarm Register Bits
T1
E1
INS_MYEL
TMYEL
AUTO_MYEL
SRED
Automatic generation of Yellow Alarm(YB2) is controlled by AUTO_YEL,
In T1 ESF framing mode, Multiframe Yellow Alarm or RAI is transmitted
In E1 CAS framing modes, Multiframe Yellow Alarm is inserted into the
Transmission of Multiframe Yellow Alarm is controlled by the register bits
Line Rate
Table
Bit Name
2-14:
Facilitates Yellow Alarm Action (requires
programming TDL1)
Set Y bit TS16 in frame 0 to 1
Conexant
Multiframe Yellow Alarm Action
[TFRM; addr 072]
[ TALM; addr 075]
[ TALM; addr 075]
[ALM3; addr 049]
Fully Integrated T1/E1 Framer and Line Interface
Register
Bt8370/8375/8376
YF
Y16
Mode
Table
N8370DSE
2-13.