Advance Information
MT9074
Bit
Name
Functional Description
Yellow Alarm
Bit
Name
Functional Description
6
D4Y48
D4
-
48
7
TFSYNC Terminal Frame Synchroniza-
tion. Indicates the Terminal
Frame Synchronization status (1
- loss; 0 - acquired). For ESF
links terminal frame synchroni-
zation and multiframe synchro-
nization are synonymous.
millisecond sample. This bit is
set if bit position 2 of virtually
every DS0 channel is a zero for a
period of 48 milliseconds. The
alarm is tolerant of errors by
permitting up to 16 ones in the
integration period. This bit is
updated every 48 milliseconds.
6
5
MFSYN Multiframe Synchronization.
C
Indicates the Multiframe Syn-
chronization status (1 - loss; 0 -
acquired). For ESF links multi-
frame synchronization and ter-
minal frame synchronization are
synonymous.
5
4
SECYEL Secondary D4 Yellow Alarm.
This bit is set if 2 consecutive ’1’s
are received in the Sbit position of
the 12th frame of the D4
superframe.
ESFYEL ESF Yellow Alarm. This bit sets if
SE
Severely Errored Frame. This
bit toggles when 2 of the last 6
received framing bits are in
the
ESF
yellow
alarm
0000000011111111 is received in
seven or more codewords out of
ten.
error.
The
framing
bits
monitored are the ESF framing
bits for ESF links, the Ft bits for
SLC-96 links and a combination
of Ft and Fs bits for D4 links
(See Framing Mode Selection
Word - page 1 address 10H).
3
2
BLUE
PDV
Blue Alarm. This bit is set if less
than 6 zeros are received in a 3
millisecond window.
Pulse Density Violation. This bit
toggles if RxB8ZS is set high, it
will toggle upon detection of 8
consecutive zeros. If RxB8ZS is
set low, it will toggle upon
detection of 16 consecutive
zeros on the line data, or if there
are less than N ones in a window
of 8(N+1) bits - where N=1 to 23.
4
LOS
Digital Los Of Signal. This bit
goes high after the detection of
192 consecutive zeros. It returns
low when the incoming pulse
density exceeds 12.5% over a
250 ms period
3 - 0
- - -
Unused.
1
0
LLED
LLDD
Line Loopback Enable Detect.
This bit will be set when a framed
or unframed repeating pattern of
00001 has been detected during a
48 millisecond interval. Up to
fifteen errors are permitted per
integration period.
Table 45 - Synchronization Status Word
(Page 3, Address 10H) (T1)
Bit
Name
Functional Description
7
D4YALM D4 Yellow Alarm. This bit is set if
bit position 2 of virtually every
DS0 channel is a zero for a period
of 600 milliseconds. The alarm is
tolerant of errors by permitting up
to 16 ones in a 48 millisecond
integration period. The alarm
clears in 200 milliseconds after
being removed from the line.
Line Loopback Disable Detect.
This bit will be set when a framed
or unframed repeating pattern of
001 has been detected during a
48 millisecond interval. Up to
fifteen errors are permitted per
integration period.
Table 46 - Alarm Status Word
(Page 3, Address 11H) (T1)
Table 46 - Alarm Status Word
(Page 3, Address 11H) (T1)
55
MITEL [ MITEL NETWORKS CORPORATION ]
