
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. P1.0.1
)
PRELIMINARY
249
ALARM GENERATION REGISTER (AGR)(ADDRESS = 0X0108H)
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
5-4
Yellow Alarm
Generation Select
R/W
00 - Transmission of Yellow Alarm is disabled.
01 - The framer transmits Yellow Alarm by converting the second MSB of all out-
going twenty-four DS0 channel into zero.
10 - The framer transmits Yellow Alarm by sending the Super-frame Alignment
Bit (Fs) of Frame 12 as one.
11 - The framer transmits Yellow Alarm by converting the second MSB of all out-
going twenty-four DS0 channel into zero.
N Mode:
00 - Transmission of Yellow Alarm is disabled.
01, 10 or 11 - The framer transmits Yellow Alarm by converting the second MSB
of all outgoing twenty-four DS0 channel into zero.
ESF Mode:
When the framer is in ESF mode, it transmits Yellow Alarm pattern of eight ones
followed by eight zeros (1111_1111_0000_0000) through the 4Kbit/s data link
bits.
00 - Transmission of Yellow Alarm is disabled.
01 - The following scenario will happen:
1.
If Bit 0 of Yellow Alarm Generation Select forms a pulse width shorter or
equal to the time required to transmit 255 patterns on the 4Kbit/s data link,
the alarm is transmitted for 255 patterns.
2.
If Bit 0 of Yellow Alarm Generation Select forms a pulse width longer
than the time required to transmit 255 patterns on the 4Kbit/s data link, the
alarm continues until Bit 0 goes LOW.
3.
A second pulse on Bit 0 of Yellow Alarm Generation Select during an
alarm transmission resets the pattern counter. The framer will send another
255 patterns of the Yellow Alarm.
10 - Bit 1 of the Yellow Alarm Generation Select forms a pulse that controls the
duration of Yellow Alarm transmission. The alarm continues until Bit 1 goes
LOW.
11 - The following scenario will happen:
1.
If Bit 0 of Yellow Alarm Generation Select forms a pulse width shorter or
equal to the time required to transmit 255 patterns on the 4Kbit/s data link,
the alarm is transmitted for 255 patterns.
2.
If Bit 0 of Yellow Alarm Generation Select forms a pulse width longer
than the time required to transmit 255 patterns on the 4Kbit/s data link, the
alarm continues until Bit 0 goes LOW.
3.
A second pulse on Bit 0 of Yellow Alarm Generation Select during an
alarm transmission resets the pattern counter. The framer will send another
255 patterns of the Yellow Alarm.
T1DM Mode:
00 - Transmission of Yellow Alarm is disabled.
01, 10 or 11 - The framer transmits Yellow Alarm by setting the Yellow Alarm bit
(Y-bit) to zero.