bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 89

• 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.

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
N8370DSE
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].
Alarm/RAI action taken for each frame format.
Table 2-11. Yellow Alarm Generation
Transmission of Yellow Alarm(YB2) is controlled by the register bits listed in
Table
Table 2-12. Yellow Alarm Register Bits
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.
bit immediately and unconditionally overwrites the Yellow Alarm signal bit(s) in
the transmitted data stream with the appropriate pattern.
SF
ESF
SLC-96
SF/JYEL
T1DM
E1
NOTE(S):
(1)
INS_YEL
TYEL
AUTO_YEL
RLOF
RLOF_INTEG
Frame Format
Manual generation of Yellow Alarm(YB2) is controlled by TYEL. Setting this
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.
(1)
2-12:
Bit Name
Bit 2 of every time slot set to 0
Bit 2 of every time slot set to 0
Bit 2 of every time slot set to 0
F-bit 12 of every superframe set to 1
Y bit of the sync byte set to 0
A bit of TS0 set to 1
Conexant
Yellow Alarm Location
[ TFRM; addr 072]
[TALM; addr 075]
[ALM1; addr 047]
[RALM; addr 045]
[TALM; addr 075]
Register
Table 2-11
describes the Yellow
YB2
YB2
BY2
YJ
Y24
Y0
Mode
2.0 Circuit Description
2.8 Transmitter
2-61