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MT9042CP Datasheet

  • MT9042CP

  • Multitrunk System Synchronizer

  • 28頁

  • MITEL

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MT9042C
Multitrunk System Synchronizer
Advance Information
Features
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Meets jitter requirements for: AT&T TR62411
Stratum 3, 4 and Stratum 4 Enhanced for DS1
interfaces; and for ETSI ETS 300 011, TBR 4,
TBR 12 and TBR 13 for E1 interfaces
Provides C1.5, C3, C2, C4, C8 and C16 output
clock signals
Provides 8kHz ST-BUS framing signals
Selectable 1.544MHz, 2.048MHz or 8kHz input
reference signals
Accepts reference inputs from two independent
sources
Provides bit error free reference switching -
meets phase slope and MTIE requirements
Operates in either Normal, Holdover and
Freerun modes
DS5144
ISSUE 2
September 1999
Ordering Information
MT9042CP
28 Pin PLCC
-40
擄
C to +85
擄
C
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Description
The MT9042C Multitrunk System Synchronizer
contains a digital phase-locked loop (DPLL), which
provides timing and synchronization signals for
multitrunk T1 and E1 primary rate transmission links.
The MT9042C generates ST-BUS clock and framing
signals that are phase locked to either a 2.048MHz,
1.544MHz, or 8kHz input reference.
The MT9042C is compliant with AT&T TR62411
Stratum 3, 4 and 4 Enhanced, and ETSI ETS 300
011. It will meet the jitter tolerance, jitter transfer,
intrinsic jitter, frequency accuracy, holdover
accuracy, capture range, phase slope and MTIE
requirements for these speci鏗乧ations.
Applications
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Synchronization and timing control for
multitrunk T1 and E1 systems
ST-BUS clock and frame pulse sources
Primary Trunk Rate Converters
TRST
Virtual
Refer-
ence
DPLL
VDD
VSS
OSCi
OSCo
Master
Clock
TIE
Corrector
Circuit
Output
Interface
Circuit
State
Select
Input
Impairment
Monitor
Feedback
Guard Time
Circuit
Frequency
Select
MUX
PRI
SEC
Reference
Select
MUX
Reference
Select
Selected
Refer-
ence
TIE
Corrector
Enable
C1.5o
C3o
C2o
C4o
C8o
C16o
F0o
F8o
F16o
State
Select
RSEL
LOS1
LOS2
Automatic/Manual
Control State Machine
MS1
MS2
RST
GTo
GTi
FS1
FS2
Figure 1 - Functional Block Diagram
1

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