Symmetricom TimeSource 500 User manual

TimeSource 3500
GPS Primary Reference Source
097-72050-01
Issue 7: August 2003

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Contents
097-72050-01 Issue 7: August 2003
FCC Regulatory Notice
Warning: This equipment generates, uses, and can radiate
radio frequency energy, and if not used in accordance with
the instruction manual, may cause interference to radio
communications. It has been tested and found to comply with
the limits for a Class A computing device pursuant to Subpart
B of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when
operated in a commercial environment. Operation of this
equipment in a residential area is likely to cause interference
in which case the user at his own expense will be required to
take whatever measures may be required to correct the
interference.
Symmetricom, Inc.
2300 Orchard Parkway
San Jose, CA 95131-1017
http://www.symmetricom.com
Copyright © 2003 Symmetricom, Inc.
All rights reserved. Printed in U.S.A.
Symmetricom is a registered trademark of Symmetricom, Inc. BesTime, DCD, and TimeSource are
trademarks of Symmetricom, Inc. All other product names, service marks, trademarks, and registered
trademarks used in this document are the property of their respective owners.

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097-72050-01 Issue 7: August 2003
Acronyms and Abbreviations
AIS alarm indication signal
ANSI American National Standards Institute
DS1 digital signal, level 1 (1.544 Mb/s)
ESD electrostatic discharge
ESF extended superframe
GPS Global Positioning System
LOS loss of signal
MDEV mean time deviation
pps pulse per second
PRS primary reference source
RO remote oscillator
RU rack unit (1.75 in.)
SSM synchronization status messaging
T1 digital transmission (1.544 Mb/s)
TDEV time deviation
TOD time of day
UTC Universal Coordinated Time

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097-72050-01 Issue 7: August 2003
What’s New in This Manual
This issue of the TimeSource 3500 user manual has the following
changes from the previous issue:
• Added “Antenna Installation and Lightning Protection”,
“Startup”, “Bridging/Holdover Behavior” and “Time Figure of
Merit” sections to Chapter 1.
• Removed TimeScan Craft connection key (020-46700-001)
from system equipment lists in Chapter 2.
• Added wall antenna L1 outdoor lightning suppressor kit (093-
72050-93) to Wall Antenna kit listing in Chapter 2.
• Added wall antenna lightning suppressor kit (093-72050-94)
to Wall Antenna kit listing in Chapter 2.
• Added information on installing wall antenna indoor lightning
suppressor kit to Procedure E, Wall Antenna Installation, in
Chapter 3.
• Added information on installing wall antenna outdoor light-
ning suppressor kit to Procedure E, Wall Antenna Installation,
in Chapter 3.
• Added section on TimeWizard software installation applica-
tion to Chapter 3.
• Added Procedure I, TimeWizard Installation and Operation,
to Chapter 3.

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097-72050-01 Issue 7: August 2003
• Added TL1 command “RTRV-HDR” for NMA keep alive
responses.

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097-72050-01 Issue 7: August 2003
Description
Chapter 1
Overview . . . . . . . . . . . . . . . . . . . 20
Global Positioning System . . . . . . . . 21
Physical Description . . . . . . . . . . . . 22
Roof Antenna . . . . . . . . . . . . . . 24
Mechanical Window Antenna . . 25
Self-Adhesive Window Antenna . . 26
Wall Antenna . . . . . . . . . . . . . . 27
Functional Description . . . . . . . . . . . 28
Overview . . . . . . . . . . . . . . . . 28
Antenna . . . . . . . . . . . . . . . . . 30
Antenna Installation and Lightning
Protection . . . . . . . . . . . . . . 30
IF Interface . . . . . . . . . . . . . . . . 32
GPS Receiver . . . . . . . . . . . . . . 32
Local Oscillator . . . . . . . . . . . . . 32
Clock Extractors . . . . . . . . . . . . 32
Power Supply . . . . . . . . . . . . . . 33
NTP TimeServer . . . . . . . . . . . . 33
Network Time Protocol Password
Activation . . . . . . . . . . . . . . 33
BesTime Ensemble Timing Generator 33
Eight Mixed E1/T1 Outputs . . . . 34
Eight Mixed T1/CCK Outputs . . . 34

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T1 Outputs . . . . . . . . . . . . . . . . 34
Additional T1 Outputs
(990-72050-02 Systems Only) 35
TOD Output . . . . . . . . . . . . . . . 35
IRIG-B TOD Outputs
(990-72050-05 Systems Only) 35
1 PPS Output . . . . . . . . . . . . . . 35
10 MHz Output . . . . . . . . . . . . 36
Composite Clock Outputs
(990-72050-03 Systems Only) 36
Alarm Interface . . . . . . . . . . . . . 36
Communication Ports . . . . . . . . . 36
Ethernet . . . . . . . . . . . . . . . . . . 36
Passthrough . . . . . . . . . . . . . . . 37
Alarm Programmability. . . . . . . . . 38
Startup . . . . . . . . . . . . . . . . . . . 39
Bridging/Holdover Behavior . . . . 40
Time Figure of Merit . . . . . . . . . . 42
Engineering &
Ordering
Chapter 2
Antenna Guidelines . . . . . . . . . . . . 46
Roof Antenna Location and Cabling
Guidelines . . . . . . . . . . . . . . 48
Roof Antenna Earth Ground Location
Guidelines . . . . . . . . . . . . . . 53

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Roof Antenna Cable Choices . . . 54
Window and Wall Antenna
Location Guidelines . . . . . . . . 56
Window and Wall Antenna
Cable Choices . . . . . . . . . . . 58
IRIG-B TOD (990-72050-05
System Only) . . . . . . . . . . . . 60
RJ-422–to–RS-232 TOD Converter 61
Shelf Considerations . . . . . . . . . . . . 62
Systems . . . . . . . . . . . . . . . . . . . . 63
Standard System (Two T1 Outputs) 64
With Eight Additional T1 Outputs 65
With Eight Additional Mixed
E1/T1 Outputs . . . . . . . . . . . 66
With Eight Additional Mixed
T1/CCK Outputs . . . . . . . . . 67
With Eight Composite Clock
Outputs . . . . . . . . . . . . . . . . 68
With Two IRIG-B TOD Outputs . . 69
Antennas . . . . . . . . . . . . . . . . . . . 70
Roof Antenna . . . . . . . . . . . . . . 71
Mechanical Window Antenna . . 72
Self-Adhesive Window Antenna . . 73
Wall Antenna . . . . . . . . . . . . . . 74

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User-Supplied Tools and Materials . . 76
For Roof Antenna Installation . . . . 77
For Mechanical Window Antenna
Installation . . . . . . . . . . . . . . 78
For Self-Adhesive Window Antenna
Installation . . . . . . . . . . . . . . 79
For Wall Antenna Installation . . . . 80
For Shelf Installation . . . . . . . . . . 81
Outputs, Power, and Miscellaneous 82
Installation
Chapter 3
Unpacking . . . . . . . . . . . . . . . . . 86
Antenna . . . . . . . . . . . . . . . . . . . 87
Roof Antenna . . . . . . . . . . . . . . 87
Mechanical Window Antenna . . . 93
Self-Adhesive Window Antenna . . 97
Wall Antenna . . . . . . . . . . . . . . 100
Shelf . . . . . . . . . . . . . . . . . . . . . 108
Rack Mounting . . . . . . . . . . . . . 108
Power and Signal Cabling . . . . . 109
Frame Ground . . . . . . . . . . . . 111
Power . . . . . . . . . . . . . . . . . 113
Alarms Output . . . . . . . . . . . . 114
GPS Antenna . . . . . . . . . . . . 114
Additional T1 Outputs
(990-72050-02 System Only) 115