TimeSource 2700
CDMA Primary Reference Source
097-73000-02
Issue 1
Symmetricom, Inc.
2300 Orchard Parkway
San Jose, CA 95131-1017
http://www.symmetricom.com
Copyright © 1999 Symmetricom, Inc.
All rights reserved. Printed in U.S.A.
All product names, service marks, trademarks and registered trademarks
used in this document are the proper ty of their respective owners.
2
TimeSource 2700
Description
Chapter 1
Introduction........................ 14
PhysicalDescription ................. 15
FunctionalDescription............... 18
Overview........................ 18
Antenna......................... 20
CDMAReceiver.................. 20
LocalOscillator................... 20
ClockExtractors.................. 20
Ensemble Timing Generator. . . . . . . . 21
T1Output....................... 21
10MHzOutput ................. 21
BTMONitorSoftware............. 22
AlarmInterface................... 22
Power........................... 22
Engineering &
Ordering
Chapter 2
ShelfConsiderations................. 24
RackMounted.................... 24
WallMounted.................... 24
Computer Requirements . . . . . . . . . . . . 25
Systems ........................... 26
Optional Wire-Wrap Panel . . . . . . . . 26
Contents
3
Installation
Chapter 3
Unpacking ......................... 30
AntennaInstallation.................. 31
Magnetic-MountAntenna.......... 31
High-GainAntenna ............... 32
ShelfInstallation..................... 35
RackMounting................... 35
WallMounting ................... 39
Cabling.......................... 39
PowerandFrameGround....... 41
OutputSpan(A,B) ............ 45
Craft......................... 47
RemoteRS-232................ 48
Alarms ....................... 49
Input Span (A, B) . . . . . . . . . . . . . . 50
10MHzOutput ............... 52
CDMAAntenna............... 52
Power-Up.......................... 53
Remote Operation via a Modem
(Optional)....................... 61
Remote Operation via a Terminal
Server(Optional)................. 66
4
TimeSource 2700
Operation
Chapter 4
Introduction........................ 72
View Alarms and Alarm Thresholds . . . . 73
Change Alarm Thresholds . . . . . . . . . . . 75
View Output Framing and Output
DuringAlarms ................... 77
View BT3 (TimeSource 2700) Mode
andDuration .................... 78
ViewAlarmLog .................... 79
SetLocationID..................... 80
Enable Inputs . . . . . . . . . . . . . . . . . . . . . . . 81
Ensemble Inputs .................... 82
View Input Weighting and Gear . . . . . . . 83
View Input Performance Statistics . . . . . 84
Set Output Format and Output During
Alarm........................... 86
View CDMA Tracking Statistics . . . . . . . 88
View CDMA Pilot Information . . . . . . . . 89
Select Pilot Signal Channel . . . . . . . . . . . 92
Contents
5
Operation
Chapter 4
(cont’d)
View Daily Holdover Information . . . . . 93
View Monthly Holdover Information . . . 95
Reset CDMA Receiver and System . . . . 97
DownloadNewSoftware ............ 98
ViewUserAccounts ................ 100
AddUserAccount.................. 101
DeleteUserAccount ............... 104
EditUserAccount .................. 105
ChangePassword ................... 107
View BTMONitor Software Version . . . 108
View Communication Information . . . . . 109
View System Firmware Information . . . 110
6
TimeSource 2700
Troubleshooting
Chapter 5
FrontPanelLamps................... 112
Theory of Alarm Processing and
Troubleshooting.................. 114
CDMA Event and Alarm Summary . . 120
CDMA Frequency Transient Event 121
CDMA Frequency Event . . . . . . . . 121
CDMA Frequency Alarm . . . . . . . 121
CDMA Time Accuracy Transient
Event ..................... 122
CDMA Clock Bias Transient Event 122
CDMA Tracking Success Alarm . . 122
Span Input Event and Alarm
Summary ..................... 123
Span Frequency Transient Event . 123
Span Frequency Alarm . . . . . . . . . 124
Span Drift Transient Event . . . . . . 124
SpanDriftAlarm .............. 125
Span Phase Transient Event . . . . . 125
SpanPhaseAlarm ............. 126
SpanJitterAlarm .............. 126
Remote Oscillator (RO) Input
Event and Alarm Summary . . . . . . 127
RO Frequency Transient Event . . 127
RO Frequency Alarm . . . . . . . . . . 128
RO Drift Transient Event . . . . . . . 128
RODriftAlarm ............... 129
RO Phase Transient Event . . . . . . 129
ROPhaseAlarm .............. 130
ROJitterAlarm ............... 130
Contents
7
Troubleshooting
Chapter 5
(cont’d)
Phase Lock Loop (PLL) Event
andAlarmSummary ........... 131
PLLStepEvent ................ 131
PLLStepAlarm ............... 132
PLLRangeEvent .............. 132
PLLRangeAlarm .............. 133
PLLJitterAlarm ............... 133
Temperature (TP) Event and
AlarmSummary............... 134
TPStepEvent ................ 134
TPStepAlarm ................ 134
TPSlewEvent ................ 135
TPSlewAlarm ................ 135
TL1Messages....................... 136
Formats......................... 136
Alarms ....................... 136
Events........................ 136
Parameters ...................... 137
Message Troubleshooting . . . . . . . . . . 139
Returning Equipment . . . . . . . . . . . . . . . . 143
TechnicalAssistance ................. 145
Sales............................... 146
ManualUpdates..................... 147
8
TimeSource 2700
Specifications
Chapter 6
Magnetic-Mount Antenna . . . . . . . . . . 150
High-GainAntenna ............... 150
Remote Communication Port . . . . . . 151
CraftCommunicationPort......... 151
T1 Inputs ........................ 152
5 MHz Inputs .................... 153
T1Outputs...................... 154
10MHzOutput.................. 155
Alarms.......................... 156
Indicators........................ 156
Power........................... 157
ShelfMechanical.................. 157
Wire-Wrap Panel Mechanical. . . . . . . 158
Environmental.................... 158
Contents
9
Acronyms and Abbreviations
AIS alarm indication signal
BTMONitor BesTime Monitoring
CDMA code division multiple access
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
MPU microprocessor
ppb parts per billion
ppm parts per million
PRS primary reference source
RO remote oscillator
RU rack unit (1.75 inches)
SSM synchronization status messaging
T1 digital transmission (1.544 Mb/s)
TDEV time deviation
TL1 Transaction Language 1
UTC Universal Coordinated Time
Contents
10
FCC Regulatory Statement
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
computingdevicepursuanttoSubpartBofPart15ofFCCrules,
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.
11
TimeSource 2700
12
TimeSource 2700
Description
This chapter provides a physical and functional
description of the TimeSource 2700.
Chapter
1
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Introduction
The TimeSource 2700 is a Primary Reference Source (PRS) that
tracks and ensembles multiple CDMA pilot signals. The CDMA
pilot signals originate from C DMA base stations equipped with
GPS based timing sources traceable to UTC. A pilot channel is
transmitted continuously by each CDMA base station. Pilot
channels allow the handset to acquire timing, provide phase data
for demodulation, and provide a signal strength comparison
between base stations.
The TimeSource 2700 provides Stratum 1 outputs by using
advanced BesTime technology. By using inputs from one to eight
CDMA pilots and a rubidium local oscillator, the TimeSource 2700
meets Telecondia GR2830 network performance requirements. If
the CDMA signals are disrupted, the BesTime algorithm continues
to predict CDMA timing information, which enhances system
holdover performance.
Since CDMA is one of the most widely-used digital wireless
services in the United States, the TimeSource 2700 can be
installed in most metropolitan areas. Because the antenna is
located inside the building within a few feet of the shelf, the
antenna installation problems sometimes encountered with GPS
based systems are eliminated.
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TimeSource 2700
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Physical Description
The TimeSource 2700 consists of a shelf, an antenna with a cable,
mounting hardware, and software.
The shelf can be mounted on a wall o r in an industry-standard
19 inch or 23 inch rack. In a rack, the shelf occupies two rack
units (RU). Except for the antenna connector, all connectors and
indicators are on the front of the shelf.
Two types of antennas are available: the magnetic-mount antenna
and the high-gain antenna.
The magnetic-mount antenna (Figure 1) consists of a receiving
element, a magnetic base, and 12 feet of coaxial cable with an
SMA connector. Because the antenna has a magnetic base, the
antenna can be located on any convenient metal structure, such
as an equipment rack or cable tray.
Warning:
magnetic-sensitive media (e.g., floppy or hard disks).
The high-gain antenna (Figure 2) consists of a high-gain antenna,
12 feet of LMR-240 cable with SMA and N connectors, and
hardware for mounting the antenna to a cable runway.
Keep the magnetic-mount antenna away from
1
2
3
Description
4
5
15
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Figure 1. Magnetic-Mount Antenna
Receiving
element
Magnetic
base
12 ft
cable
SMA connector
16
TimeSource 2700
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Figure 2. High-Gain Antenna
Antenna
1
2
3
N connector
Description
4
5
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Functional Description
Overview
Figure3showsthemainfunctionsoftheTimeSource2700.The
center of the TimeSource 2700 is the BesTime Ensemb le Timing
Generator. The Ensemble Timing Generator can receive multiple
timing references, analyze their phase and frequency
characteristics, and dynamically weight each input, to maximize
the stability and accuracy of the timing outputs.
In the TimeSource 2700 application, the CDMA input normally
receives full weight, and actively disciplines the timing outputs.
Because of the exceptional stability of the local rubidium
oscillator, the optional span line and 5 M Hz remote oscillator
inputs are not normally used in the ensembled timing output
solution. If any of the optional inputs are provisioned for
ensembling, the BesTime algorithm continuously determines the
optimum input weighting mix, and may use one or all of these
references, by dynamically placing increasingly greater weighting
values on the most stable input or inputs. G reater weighting
values are not normally placed on the optional inputs, but if this
is the case, it would occur during extended CDMA outage periods.
18
Even if the optional inputs are not actively used in the output
ensemble, the BesTime Ensemble Timing Generator continuously
collects full timing statistics on each input, with respect to the
output timing signal. These statistics can be used to detect timing
problems on an incoming reference.
TimeSource 2700
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Figure 3. TimeSource 2700 Block Diagram
Optional
sources
RO input A
Antenna
input
T1 input
span A
T1 input
span B
CDMA
Receiver
Local Rb
Oscillator
Clock
Extractor
Clock
Extractor
Clock
Extractor
Alarm
Interface
MPU
Ensemble
Timing
Generator
TL1 messages
Alarm contacts
Status lamps
Local computer
with BTMONitor
Remote computer
with BTMONitor
Output span A
Output span B
10 MHz
1
2
3
RO input B
–48 V in
–48 V in
Clock
Extractor
Power
Supply
Power to shelf
Power to shelf
Description
4
5
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Antenna
The CDMA antenna mounts inside the building within 12 feet of
the TimeSource 2700 Shelf. A single cable transports the CDMA
pilot signals to the she lf.
CDMA Receiver
The CDMA Receiver automatically and continuously tracks
multiple 1930 MHz-to-1990 MHz PCS band CDMA pilot signals.
Local Oscillator
A rubidium oscillator, based on a digitally controlled servo-loop,
provides an ultra-stable local oscillator signal, which is sent to the
Ensemble Timing Generator.
Clock Extractors
20
T1 signals (bridged or terminated) and remote oscillator signals
can enter on the Input Span A and B connectors. These optional
inputs can be monitored, or used as back-up inputs to the system,
in case of a long-term loss of the CDMA input. A Clock Extractor
circuit extracts a clock from each of these signals, and sends the
clocks to the Ensemble Timing Generator.
TimeSource 2700
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Ensemble Timing Generator
The clock signals from the CDMA Receiver, a local oscillator, T1
span lines (optional), and 5 MHz remote oscillators (optional) are
used as sources by the BesTime algorithms in the Ensemble
Timing Generator. The signals are analyzed for MDEV, TDEV, and
other phase and frequency characteristics.
The BesTime Ensemble Timing Generator uses statistical clock
models to analyze each clock, and to synthesize highly stable
output timing signals.
T1 Output
The Ensemble Timing Generator provides the timing for the T1
timing signals available at the Output Span A and B connectors in
a framed, all-ones format, which is selectable in either D4 or ESF
framing. SSM is available with ESF framing.
10 MHz Output
The Ensemble Timing Generator provides the timing for the
10 MHz low-phase-noise timing signal, available at the 10 MHz
Output connector, which can be used for local cellular frequency
or testing purposes.
1
2
3
4
Description
5
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BTMONitor Software
BTMONitor (BesTime Monitoring) is a Windows 95/98/NT
compatible craft software program, which provides system
configuration, alarms, and diagnostics. BTMONitor resides on a
user-provided PC, and interfaces to the Tim eSourc e 2700 Shelf via
the local (Craft) or remote (Remote) RS-232 communication port.
Alarm Interface
The MPU delivers major and minor alarms to dry-contact type
connections at the Alarms connector. Alarms are also indicated by
the front-panel status lamps, by the BTMONitor application,
which provides extensive reports of alarm status, and by TL1
messages reported via the Craft COM port.
Power
A power converter filters and converts–48 volt dc power supplied
to the shelf into the voltages required by the shelf. Dual power
feeds are supplied through the Power A and B connectors.
22
TimeSource 2700
Engineering & Ordering
This chapter describes mounting configurations for the
TimeSource 2700 Shelf, lists computer requirements for
operating the TimeSource 2700, and lists parts included
in the TimeSource 2700 System.
Chapter
2
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Shelf Considerations
Rack Mounted
The TimeSource 2700 Shelf can be mounted in either a
19 inch or 23 inch rack. Supplied mounting ears can be
positioned for flush or 5 inch offset mounting. Allow for two
RUs (3-1/2 inches) of vertical space on the rack, per shelf.
To make power, input, output, and alarm connections from
the rear of the rack, instead of the front of the shelf, a
wire-wrap panel is available separately, as an option. The
wire-wrap panel can be mounted below a rack-mounted
shelf, in either a 19 inch or 23 inch rack. Mounting ears
(supplied with the option) can be positioned for flush or
5 inch offset mounting. Allow for two RUs (3-1/2 inches) of
vertical space on the rack, per wire-wrap panel.
Wall Mounted
24
The TimeSource 2700 can be attached to a wall or other
surface by ordering the appropriate wall-mount
configuration option.
TimeSource 2700
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Computer Requirements
A user-supplied computer is required to operate the
TimeSource 2700 System. Minimum requirements are as
follows:
• Operating system: Windows 95, Windows 98, or Windows NT 4.0
• CPU: x486 or equivalent, at 33 MHz
•RAM:8MB
• Serial communications port
• 3-1/2 in. floppy disk drive
• Recommended: spreadsheet application that can accept
comma-delimited (.csv) data files, to process the logged
files
2
2
3
Engineering & Ordering
4
5
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Systems
Table A lists the parts included in TimeSource 2700
Systems. There are four kits for TimeSource 2700 Systems:
• Rack-mount shelf with magnetic-mount antenna
• Wall-mount shelf with magnetic-mount antenna
• Rack-mount shelf with high-gain antenna
• Wall-mount shelf with high-gain antenna
Optional Wire-Wrap Panel
The wire-wrap panel (990-73000-11) is available separately,
as an option, for the rack-mounted TimeSource 2700. It
includes the panel and cables for connecting to the
TimeSource 2700, and hardware for mounting in a 19 inch
or 23 inch rack.
26
TimeSource 2700
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Table A. TimeSource 2700 Parts
Part Number Description
Rack-Mount Shelf with Magnetic-Mount Antenna (990-73000-02)
090-73000-02 TimeSource 2700 Shelf
093-73010-01 Magnetic-mount antenna with 12 ft cable
093-73000-02 Hardware kit (mounting brackets [2 RU] and hardware for mounting in a
19 in. or 23 in. rack)
992-73000-01 BTMONitor software
997-73000-02 Manual
060-00067-01 Cable for connecting to a PC
Wall-Mount Shelf with Magnetic-Mount Antenna (990-73000-03)
2
2
090-73000-02 TimeSource 2700 Shelf
093-73010-01 Magnetic-mount antenna with 12 ft cable
093-71000-03 Hardware kit (2 angle brackets and bracket mounting screws [user must
supply screws for mounting shelf to a wall])
992-73000-01 BTMONitor software
997-73000-02 Manual
060-00067-01 Cable for connecting to a PC
Engineering & Ordering
3
4
5
27
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Table A. TimeSource 2700 Parts (cont’d)
Part Number Description
Rack-Mount Shelf with High-Gain Antenna (990-73000-04)
090-73000-02 TimeSource 2700 Shelf
093-73010-02 High-gain antenna kit (includes 12 ft cable and mounting hardware)
093-73000-02 Hardware kit (mounting brackets [2 RU] and hardware for mounting in a
19 in. or 23 in. rack)
992-73000-01 BTMONitor software
997-73000-02 Manual
060-00067-01 Cable for connecting to a PC
Wall-Mount Shelf with High-Gain Antenna (990-73000-05)
090-73000-02 TimeSource 2700 Shelf
093-73010-02 High-gain antenna kit (includes 12 ft cable and mounting hardware)
093-71000-03 Hardware kit (2 angle brackets and bracket mounting screws [user must
supply screws for mounting shelf to a wall])
992-73000-01 BTMONitor software
997-73000-02 Manual
060-00067-01 Cable for connecting to a PC
28
TimeSource 2700
Installation
This chapter provides the steps required to
install and power-up the TimeSource 2700.
Chapter
3
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Unpacking
Install the TimeSource 2700, using steps in the order given in this
chapter. If any difficulties are encountered during the installation
process, contact Symmetricom’s Customer Technical Assistance
Center (CTAC) at:
• 1 888 367 7966 (North America and other areas, where available)
• +1 408 428 7907 (U.S.A.)
• +44 1483 510300 (U.K.)
CTAC includes Product Technical Support for technical
information, and Customer Service for information about an order,
RMAs, and other information.
30
Warning:
procedures regarding electrostatic discharge (ESD), including:
Note:
packed in the original packing material. Contact CTAC if additional
packaging is needed.
Unpack equipment carefully; check for completeness against the
purchase order. Notify Symmetricom if items are missing.
Inspect equipment for shipping damage, including bent or loose
hardware, and broken connectors.
If equipment was damaged in transit, contact Customer Service to
request an RMA, and notify the carrier.
TimeSource 2700
When handling electronic equipment, use local office
• Use grounded wrist straps connected to equipment frame
ground when handling cards.
• Store cards only in antistatic packaging provided by the factory.
Save packing material. All equipment returned must be
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