
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
PRELIMINARY
REV. P1.0.1
46
T
ABLE
17: A
LARM
G
ENERATION
R
EGISTER
-T1 M
ODE
R
EGISTER
8 - T1 M
ODE
A
LARM
G
ENERATION
R
EGISTER
(AGR) H
EX
A
DDRESS
: 0
X
0108
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
Reserved
-
-
Reserved
6
LOF
R/W
0
Loss of Frame Declaration Criteria
A Red Alarm is generated by the receiver to indicate the loss of frame (LOF)
alignment. A Yellow Alarm is then returned to the remote transmitter to report
that the receiver detects LOF. Setting this bit will set the criteria for preventing
red alarm from generation as long as the frame is aligned. Otherwise, the frame
and multiframe must be both aligned in order to keep red alarm from happening.
5
YEL(1)
R/W
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 patterns.
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 pattern
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.
4
YEL(0)
R/W
0
3
AISG(1)
R/W
0
AIS Generation Select
These Read/Write bit-fields are used to configure the channel to generate 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
2
AISG(0)
R/W
0
1
AISD(1)
R/W
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
0
AISD(0)
R/W
0