參數(shù)資料
型號(hào)： MT9044
廠商： Mitel Networks Corporation
英文描述： T1/E1/OC3 System Synchronizer(T1/E1/OC3 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）)
中文描述： T1/E1/OC3系統(tǒng)同步器（T1/E1/OC3系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成））
文件頁數(shù)： 17/34頁
文件大?。?/td> 150K
代理商： MT9044
MT9044
17
has expired. An unsymmetrical Guard Time Circuit is
shown in Figure 12.
Figure 12 - Unsymmetrical Guard Time
Circuit
Figure 13 shows a typical timing example of an
unsymmetrical Guard Time Circuit with the MT9044
in Automatic Control.
TIE Correction (using GTi)
When Primary Holdover Mode is entered for short
time periods, TIE correction should not be enabled.
This will prevent unwanted accumulated phase
change between the input and output. This is mainly
applicable
to
Manual
Control,
Control
together
with
the
inherently operate in this manner.
since
Automatic
Time
Guard
Circuit
For instance, 10 Normal to Holdover to Normal mode
change sequences occur, and in each case Holdover
was entered for 2s. Each mode change sequence
could account for a phase change as large as 350ns.
Thus, the accumulated phase change could be as
large as 3.5us, and, the overall MTIE could be as
large as 3.5us.
0.05ppm is the accuracy of Holdover Mode
50ns is the maximum phase continuity of the
MT9044 from Normal Mode to Holdover Mode
200ns is the maximum phase continuity of the
MT9044 from Holdover Mode to Normal Mode (with
or without TIE Corrector Circuit)
When 10 Normal to Holdover to Normal mode
change sequences occur without MTIE enabled, and
in each case holdover was entered for 2s, each
mode change sequence could still account for a
phase change as large as 350ns. However, there
would be no accumulated phase change, since the
input to output phase is re-aligned after every
Holdover to Normal state change. The overall MTIE
would only be 350ns.
R
P
1k
GTi
C
10uF
R
C
150k
MT9044
GTo
+
R
D
1k
Phasehold
Phasestate
Phase
10
0.05
ppm
2
s
×
100
ns
=
=
50
ns
200
ns
250
ns
=
+
=
10
250
ns
100
ns
+
(
)
×
3.5
us
=
=
Figure 13 - Automatic Control, Unsymmetrical Guard Time Circuit Timing Example
PRI
NORMAL
SEC
NORMAL
PRI
HOLDOVER
PRI
NORMAL
LOS2
GOOD
PRI
SIGNAL
STATUS
SEC
SIGNAL
STATUS
LOS1
PRI
NORMAL
PRI
HOLDOVER
BAD
GOOD
BAD
GOOD
GOOD
GTo
GTi
MT9044
STATE
V
SIH
NOTES:
1. T
D
represents the time delay from when the reference goes
bad to when the MT9044 is provided with a LOS indication.
T
D
T
D
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