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MSTM-S4E Datasheet(PDF) 1 Page - Connor-Winfield Corporation

Part No. MSTM-S4E
Description  STRATUM 4E SIMPLIFIED CONTROL TIMING MODULES
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Maker  CONNOR-WINFIELD [Connor-Winfield Corporation]
Homepage  http://www.conwin.com
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MSTM-S4E Datasheet(HTML) 1 Page - Connor-Winfield Corporation

   
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THE CONNOR-WINFIELD CORP.
2111 COMPREHENSIVE DRIVE.
AURORA, IL 60505.
FAX (630) 851-5040.
PHONE (630) 851-4722
HTTP://WWW.CONWIN.COM
DATA SHEET #: ____________ PAGE
1
OF
5
REV:________ DATE:____________
CONNOR
WINFIELD
© Copyright 2000 Connor-Winfield all rights reserved.
Specifications subject to change without notice.
TM015
7/3/00
01
NETWORK ELEMENT TIMING GENERATOR
STRATUM 4E SIMPLIFIED CONTROL
TIMING MODULES (MSTM-S4E)
INT
MSTM-S4E PIN ASSIGNMENT
DESCRIPTION
The Connor-Winfield Stratum 4E Simplified Control
Timing Module acts as a complete system clock module for general
Stratum 4E timing applications. The MSTM is designed for external
control functions. Full external control input allows for selection
and monitoring of any of four possible operating states: 1)
Holdover, 2) External Reference #1, 3) External Reference #2, and
4) Free Run. TABLE 1.0 illustrates the control signal inputs and
the corresponding operational states:
In the absence of External Control Inputs (A,B), the
MSTM enters the Free Run mode and signals an External Alarm.
The MSTM will enter other operating modes upon application of
a proper control signal. Mode 1 operation (A=1, B=0) results in
an output signal that is phase locked to the External Reference
Input #1. Mode 2 operation (A=0, B=1) results in an output signal
that is phase locked to External Reference Input #2. Holdover
mode operation (A=1, B=1) results in an output signal at or near
the frequency as determined by the latest (last) locked-signal input
values and the holdover performance of the MSTM.
Alarm signals are generated at the Alarm Output during
Holdover and Free Run operation. Alarm Signals are also
generated by Loss-of-Lock, Loss-of-Reference, and by a Tune-
Limit indication from the PLL. A Tune-Limit alarm signal indicates
that the VCXO tuning voltage is approaching within 10% the limits
of its lock capability and that the External Reference Input may
be erroneous. A high level indicates an alarm condition. Real-
time indication of the operational mode is available at unique
operating mode outputs on pins 1-4.
+5Vdc
EX_REF 1
GND
EX_REF 2
GND
CLK_OUT
GND
SYNC_OUT
GND
HOLDOVER
REF_1
REF_2
FREERUN
GND
ALARM_OUT
CNTL_A
CNTL_B
PLL_TVL
BOTTOM VIEW
Control loop filters effectively attenuate any reference
jitter and smooth out phase transients.
BLOCK DIAGRAM
MSTM-S4E
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CNTL_A
CNTL_B
TABLE 1.0
2:4
0
1
2
3
HOLDOVER
REF 1
REF 2
FREERUN
EX_REF_ 1
EX_REF_2
2:1
MUX
STRATUM 4
VCXO
DAC
FILTERS
PHASE
COMPARATOR
CLK_OUT
SYNC_OUT
PLL_TVL
ALARM
OUT
TUNING
VOLTAGE
MONITOR
STRATUM 4
TCXO
DAC
FIFO
2:1
MUX
PLL_TVL
FREERUN
HOLDOVER
LOCK AND
DETECTION


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