MSTM-S4E Datasheet, PDF (1/5 Pages) Connor-Winfield Corporation – STRATUM 4E SIMPLIFIED CONTROL TIMING MODULES

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NETWORK ELEMENT TIMING GENERATOR
STRATUM 4E SIMPLIFIED CONTROL
TIMING MODULES (MSTM-S4E)
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.
Control loop filters effectively attenuate any reference
jitter and smooth out phase transients.
MSTM-S4E PIN ASSIGNMENT
+5Vdc
EX_REF 1
GND
EX_REF 2
GND
CLK_OUT
GND
SYNC_OUT
GND
BOTTOM VIEW
HOLDOVER
REF_1
REF_2
FREERUN
GND
ALARM_OUT
CNTL_A
CNTL_B
PLL_TVL
CNTL_A
CNTL_B
EX_REF_ 1
EX_REF_2
0
1
2
2:4 3
BLOCK DIAGRAM
FREERUN
REF 1
REF 2
HOLDOVER
PLL_ TVL
FREERUN
HOLDOVER
2:1
MUX
PHASE
COMPARATOR
LOCK AND
DETECTION
DAC
FILTERS
TUNING
VOLTAGE
MONITOR
PLL_TVL
DAC
STRATUM 4
VCXO
FIFO
STRATUM 4
TCXO
MSTM-S4E
ALARM
OUT
2:1
MUX
SYNC_OUT
CLK_OUT
TABLE 1.0
CONTROL
INPUT
A
B
0
0
External
1
0 Reference
#1
External
0
1 Reference
#2
1
1
OPERATIONAL MODE
Free Run (Default)
Normal
Tune Limit
LOR + LOL
Normal
Tune Limit
LOR + LOL
Holdover
INT
DATA SHEET #: _T_M__0_1_5______ PAGE 1 OF 5
REF_1
REF_2 HOLDOVER FREERUN PLL_TVL
ALARM
OUTPUT
0
0
0
1
0
0
1
0
0
1
0
0
0
1
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
1
0
0
1
0
0
1
Specifications subject to change without notice.
REV:__0_1_____ DATE:___7_/_3_/_0_0____ © Copyright 2000 Connor-Winfield all rights reserved.