XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. 1.0.1
TABLE 17: ALARM
G
ENERATION
REGISTER -T1 MODE
R
EGISTER 8 - T1 MODE
A
LARM
G
ENERATION EGISTER (AGR)
R
H
EX
ADDRESS: 0X0108
B
IT
F
YEL(1)
YEL(0)
UNCTION
T
YPE
R/W
R/W
D
EFAULT
DESCRIPTION-OPERATION
5
4
0
0
Yellow Alarm and Multiframe Yellow Alarm Generation
These bits activate and deactivate the transmission of a yellow alarm.
The decoding of these bits are explained as follows:
00, = Disable the transmission of yellow alarm.
01 = In SF mode (or N mode), yellow alarm is transmitted as bit 2 = 0
(second
MSB) in all DS0 data channel. In T1DM mode, yellow is transmitted
to the
remote terminal by setting the outgoing Y-bit to zero. In ESF mode,
follow
the following scenario:
1. If YEL[0] forms a pulse width shorter or equal to the time required to
transmit
255 pattern of 1111_1111_0000_0000 (eight ones followed by eight
zeros) on
the 4-kbit/s data link (M1-M12), the alarm is transmitted for 255 pat-
terns.
2. If YEL[0] is a pulse width longer than the time required to transmit
255
patterns, the alarm continues until TYEL[0] goes low.
3. A second YEL[0] pulse during an alarm transmission resets the pat-
tern
counter and extends the alarm duration for another 255 patterns.
10 = In SF mode, yellow alarm is transmitted as a "1" for the Fs bit of
frame 12,
this is yellow alarm for J1 standard. In T1DM mode, yellow is
transmitted to
the remote terminal by setting the outgoing Y-bit to zero. In ESF
mode,
yellow alarm is controlled by the duration of YEL[1]. This allows
continuous
alarms of any length.
11 = Disable the transmission of yellow alarm.
3
2
AISG(1)
AISG(0)
R/W
R/W
0
0
AIS Generation Select
These Read/Write bit-fields are used to configure the channel to gener-
ate and transmit an AIS pattern, as described below.
00 = No AIS Alarm generated
01 = Enable unframed AIS alarm generation
10 = No AIS Alarm generated
11 = Enable framed AIS alarm generation
1
0
AISD(1)
AISD(0)
R/W
R/W
0
0
AIS Pattern Detection Select
These Read/Write bit-fields are used to specify the type of AIS pattern
that the receive E1 framer block will detect as described below.
00 = Disabled
01 = Unframed AIS alarm detection
10 = AIS16 detection
11 = Unframed AIS alarm detection
43
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