Symmetricom DCD LPR Manual
Symmetricom DCD LPR Manual
Symmetricom DCD LPR Manual
FUNCTIONAL DESCRIPTION
MIS Maintenance Interface, System ST2, and ST2E cards, these cards are collec-
NTP network time protocol tively referred to as rubidium clock cards.
PRC Primary Reference Clock The TNC-E and ST2E clock cards are identi-
PRS primary reference source cal in specifications, functions, controls and
pps pulses per second indicators, and acceptance test procedures.
RU rack unit The TNC-E name uses ITU standard termi-
SSM Synchronization Status Messaging nology; the ST2E name uses ANSI standard
SSU Synchronization Supply Utility terminology. The TNC-E and ST2E are inter-
ST2 Stratum-2 Clock changeable.
ST2E Enhanced Stratum-2 Clock
ST3E Enhanced Stratum-3 Clock 2. Where information is common to the TNC and
TI timing interface card or slot ST3E cards, these cards are collectively re-
TNC Transit Node Clock ferred to as quartz clock cards.
TOD Time-of-Day
USNO United States Naval Observatory
UTC Universal Coordinated Time 2. SYSTEM DESCRIPTION
WAN wide area networks
2.01 The DCD-LPR (Figure 1) provides Stratum-1
Notes: quality reference signals when used with the DCD-
ST2, DCD-419, and DCD-500 Series Systems.
1. Where information is common to the TNC-E,
I/O A
COMMA COMMB
GTR LORAN OSCA OSCB NC C NO
J9
AUD
MAJ
B A
VIS
1 J15 J16
RTN TB3 TB6 RTN
STAT
RTN RTN
J10 GTR LORAN MSTR EXP1 EXP2 EXP3
DIG POWER B ANTENNA B DIG
SW1
GND 0 FRM GND
PWR- PWR+ CMN GND SIG- SIG+
FRM 1 FRM
GND 1 2 3 4 GND
1
TB4 TB7 J5 J6 J7 J8
I/O B
B. Backplane
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Issue 10: Apr 01 TMSL 097-45100-02
NAME USED
IN THIS
CARD SECTION PART NUMBER REVISION FEATURES
ANSI-STANDARD CARDS
GTIV5 GTI-17 090-42140-17 – Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
ter quality clocks, any combination of two quartz,
rubidium, or better quality clocks, or LOU card
Output: 1.544 Mb/s (T1)
Framing format: ESF or D4
Time-of-Day
SSM capable
GTI GTI-15 090-42140-15 A Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
ter quality clocks, any combination of two quartz,
GTIV5 GTI-15 090-42140-15 B or later
rubidium, or better quality clocks, or LOU card
Output: 1.544 Mb/s (T1)
Framing format: ESF or D4
Time-of-Day
GTI GTI-13 090-42140-13 D or earlier Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
(Note 4) ter quality clocks, any combination of two quartz,
rubidium, or better quality clocks, or LOU card
GTIV5 GTI-13 090-42140-13 E or later
Output: 1.544 Mb/s (T1)
(Note 4)
Framing format: ESF or D4
GTI GTI-11 090-42140-11 – Input: 5 MHz or 10 MHz, from rubidium or better qual-
(Note 4) ity clocks, ST2E or ST2 cards only
Output: 1.544 Mb/s (T1)
Framing format: ESF or D4
LTI LTI 090-41140-01 – Input: 5 MHz from rubidium or better quality clocks,
ST2E or ST2 cards only
Output: 1.544 Mb/s (T1)
Framing format: ESF or D4
ITU-STANDARD CARDS
GTIV5 GTI-18 090-42140-18 – Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
ter quality clocks, any combination of two quartz,
rubidium, or better quality clocks, or LOU card
Output: 2.048 Mb/s (E1)
Framing format: CCS/CAS with or without CRC-4
Time-of-Day
SSM capable
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TMSL 097-45100-02 Issue 10: Apr 01
NAME USED
IN THIS
CARD SECTION PART NUMBER REVISION FEATURES
ITU-STANDARD CARDS (Cont’d)
V5
GTI GTI-16 090-42140-16 – Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
ter quality clocks, any combination of two quartz,
rubidium, or better quality clocks, or LOU card
Output: 2.048 Mb/s (E1)
Framing format: CCS/CAS with or without CRC-4
Time-of-Day
GTI GTI-14 090-42140-14 D or earlier Input: 5 MHz or 10 MHz, from quartz, rubidium, or bet-
(Note 4) ter quality clocks, any combination of two quartz,
rubidium, or better quality clocks, or LOU card
GTIV5 GTI-14 090-42140-14 E or later
Output: 2.048 Mb/s (E1)
(Note 4)
Framing format: CCS/CAS with or without CRC-4
GTI GTI-12 090-42140-12 – Input: 5 MHz or 10 MHz, from rubidium or better qual-
(Note 4) ity clocks, TNC-E cards only
Output: 2.048 Mb/s (E1)
Framing format: CCS/CAS with or without CRC-4
ANSI-STANDARD AND ITU-STANDARD CARDS
LOU LOU-1 090-42145-01 – Source: one oven-controlled crystal oscillator with two
parallel outputs
LOU LOU-2 090-42145-02 – Source: two independent oven-controlled crystal oscil-
lators, each with one output
Notes:
1. The V5 indicates that this is a Version 5 card.
2. Where information is common to all GTI cards, these cards are collectively referred to as GTI cards.
3. Where information is common to both LOU cards, these cards are collectively referred to as LOU cards.
4. Manufacture discontinued.
2.03 The DCD-LPR equipped with LOU and GTI 2.06 Both the GTI and LTI cards employ sophisticat-
cards provides office PRS timing as specified by in- ed ensembling to ensure the highest levels of reliabil-
dustry standards. ity, comply with tightening PRS performance masks,
and mitigate known performance degradation effects
2.04 The DCD-LPR accepts up to two GTI or LTI of GPS and LORAN-C signals.
plug-in cards in any combination.
2.07 Ensemble averaging is a mathematical treat-
2.05 The DCD-LPR, when used in conjunction ment of network synchronization. As a process, it
with the DCD Shelf and its clocks (rubidium or bet- treats a group of timing sources and their relative
ter quality), is a network (PRS), as specified by in- time errors simultaneously to produce an output sig-
dustry standards. Using GPS and/or LORAN-C nal that achieves a greater overall accuracy and sta-
radio navigation services, the DCD-LPR System bility than any single source. In a timing ensemble
can provide independent and diverse timing sourc- arrangement, each timing reference is adjusted by
es for both network or office primary reference clock the time error between itself and a weighted average
applications. of the group.
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Issue 10: Apr 01 TMSL 097-45100-02
2.08 The advantages of ensemble averaging for pre- tained via the rear RS-232 port for debugging
cise time scale determination is a significantly re- purposes only when necessary.
duced sensitivity to internal and external noise, and
elimination of a master clock dependency. These facts A. Output Signals
provide survivability and greater stability for the
group as a whole. This is because the ensemble av- 2.14 The timing interface (TI) cards convert the tim-
eraging output provides the best performance of the ing signals provided by the (associated) antenna(s)
best sources in the ensemble. into two primary rate T1 or E1 timing references, and
passes them to the DCD Shelf.
2.09 The GTI is used to extract the UTC traceable
clock and mitigate the effects of GPS signal instabili- B. Input Reference Signals
ties. This is accomplished in two stages:
2.15 The DCD-LPR can accept two radio navigation-
1. Simultaneously ensemble averaging six satel- al frequency references (GPS and LORAN-C).
lites in the GTR’s field of view; a maximum of
eight satellites will be processed in a round-rob- 2.16 The two uncorrected oscillator sources are also
in method, if visible. used as timing reference sources to the timing inter-
face cards. The sources can be from the from the DCD
2. Ensemble averaging the uncorrected oscillator Shelves, from a Symmetricom cesium clock source, or
sources from the clocks in the DCD Shelf. from the LOU card. The DCD Shelf clocks are an in-
tegral component of the DCD-LPR. These clocks pro-
Note: If LOU cards are used, the GTI takes vide true short-term stability to the GTI or LTI card
the ensemble averaged GTR signal informa- needed for PRS timing.
tion, but does not ensemble average the uncor-
rected oscillator input from the LOU card. 2.17 If the clock card installed in the ST A or TNC A
slot (the primary source) of the DCD Shelf is removed,
2.10 It is the combination of the six-satellite ensem- the TI card will automatically switch reference to the
ble and the short-term stability of the uncorrected os- clock card installed in the ST B or TNC B slot. When
cillator sources that removes the instabilities, and the clock card is plugged back into the ST A or TNC A
provides PRS timing. slot, the TI card will not immediately switch reference
back to the ST A or TNC A. The switch occurs 5 min-
2.11 The LTI ensemble averages all of the stations utes after the ST A or TNC A card is active and pro-
within the two nearest Group Repetition Intervals viding clock output.
(GRIs), such that reliable performance is not depen-
dent on a single station. For LORAN-C, one of the pri- 2.18 Prior to switching reference, the TI card will
mary concerns for reliable performance is the effects output a 600 ns transient pulse to cause the clock
of electrical storms between the LORAN-C receiving cards to perform a phase buildout to prevent the tim-
antenna and the LORAN-C transmit station. Ensem- ing output from moving. Occasionally, this may cause
ble averaging multiple stations can eliminate adverse the clock card to momentarily display DRIFT/
effects of electrical storms. INP TOL alarms. The ST A or TNC A card will then
go into freerun. This non-service affecting condition
2.12 The LTI also uses the short-term stability of the remains for approximately 1 minute, after which the
uncorrected oscillator sources from the DCD Shelf condition clears.
clocks to output a signal fully compliant with the per-
formance masks for a PRS. C. SSM
2.13 Both the GTI and the LTI perform self-manage- 2.19 The DCD-LPR can deliver Synchronization Sta-
ment and autonomous error checking. The DCD-LPR tus Messaging (SSM) messages to network elements
constantly monitors all stages of the PRS output sig- and BITS/SSU equipment which require SSM input
nal generation. If a problem occurs that cannot be re- signals. The GTI card delivers the appropriate SSM
solved by the GTI or LTI, an alarm is raised and a message, depending on the status of the GPS system.
message is displayed on the LCD display of each tim-
ing input card. Additional information may be ob- 2.20 When the system is in a normal condition, and
locked to the GPS satellites, the GTI card generates a
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TMSL 097-45100-02 Issue 10: Apr 01
PRC/PRS SSM message, indicating that the signal 2.27 The GTI also powers the GTR via a three-con-
can be used as a primary reference signal. If the tim- ductor cable. The GTR requires power because it con-
ing signal from the GTR degrades, or is invalid, the tains active electronics (as do all GPS antennas), and
output of the GTI signal will change its SSM message. may be powered separately from the GTI.
See Table B.
2.28 The LTI whip antenna is passive. The preamp
Table B. Signal Output for GTI-17 and -18 associated with the LTI whip antenna (to transmit
the signal through the twinax cable) requires power
TL1 GTI GPS GTI for an FET (required as a bandpass filter).
ATTRIBUTE LOCK INVALID CARD
F. GPS Timing Antenna/Receiver (GTR)
SSME PRC DNU GTI-18
SSMEC PRC UNK GTI-18 2.29 The GTR is a six-channel GPS receiver, capable
of simultaneously tracking up to eight Global Posi-
SSMT PRS STU GTI-17 tioning System (GPS) satellites, and provides timing
information to the GTI. The GTR also provides Uni-
versal Coordinated Time (UTC) information to the
2.21 SSM operation is enabled by TL1 command via GTI for display.
the MIS card. For details on TL1 commands, refer to
the TL1 User’s Guide provided with the MIS card. 2.30 The GTR is available with Time-of-Day capabil-
ities; a version of the GTR is available with leap sec-
D. Fuse and Alarm ond capabilities. Twice a year (end of July and
December), the US Naval Observatory (USNO) de-
2.22 Fuse and alarm functions provide monitoring cides whether or not to add a leap second. This feature
and filtering of the input power from two –48 volts dc notifies timed equipment that the addition of a leap
office batteries from the office power distribution pan- second is pending, and that tracking of the leap sec-
el. ond should be implemented.
2.23 Depending on which alarms are activated in the Note: Contact Symmetricom Customer Assis-
DCD-LPR, audible and visual alarm indicator out- tance Center (CTAC) regarding availability of
puts are activated. the GTR with leap second capabilities at one
of the following numbers:
2.24 Each TI card is self-contained and provides in-
dividual alarm and status information. Minimum •+44 1483 510300 (U.K.)
alarm and status information for each TI card is:
•+1 408 428 7907 (U.S.A.)
• Major alarm, form-C relay (visual and audible)
The following toll-free number is available in
• Minor alarm, form-C relay (visual and audible) some countries to access Symmetricom’s In-
side Sales and CTAC in the U.S.A.: +1 888 367
• Status, form-C relay; reserved for future use 7966 (U.S.A.).
2.25 A front-panel ACO pushbutton, when pressed, 2.31 The GTR uses multiple satellites, and performs
silences the audible alarm, and lights the ACO lamp. a majority vote on the timing information obtained
from each satellite.
E. Power
2.32 Majority vote is the process which validates ref-
2.26 The DCD-LPR Shelf is powered by two separate erence sources against preset performance criteria.
–48 volts dc office battery inputs. Both the redundant The algorithm measures and compares the timing in-
inputs are fused on the shelf, then bused to the cards formation obtained from each timing source (e.g., a
in the shelf. If one of the battery feeds/fuses fails, a satellite). If, during the process of the individual com-
fuse alarm is indicated. parisons, the computed value exceeds one of the pre-
set thresholds, that source is disqualified.
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Issue 10: Apr 01 TMSL 097-45100-02
2.36 These signals are Manchester-encoded, and 2.41 The encoder takes the GTR information, and
transmitted over fiber optic cable. The fiber cable pro- Manchester-encodes the clocking signals and any
vides robust protection to the DCD-LPR System from data messages to the GTI.
EMI effects on this data channel link.
2.42 For leap second capabilities, the GTR uses an
2.37 The GTR consists of four main sections (refer to algorithm that transmits a “leap second pending”
Figure 2), message twice a year (end of July and December) for
2 months.
• Receiver
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TMSL 097-45100-02 Issue 10: Apr 01
3-CONDUCTOR CABLE
Page 8
Issue 10: Apr 01 TMSL 097-45100-02
G. LORAN-C Antenna 3.04 Information from the GTR is sent to a fiber op-
tic receiver/transmitter in the GTI card. The trans-
2.43 The LORAN-C antenna is designed to work mitter and receiver are incorporated on the I/O
with the LTI (do not attempt to use an antenna from module located on the DCD-LPR Shelf backplane. A
another source). It is a 2.4 meter (8 foot), whip (omni- lamp on the module lights green to indicate that a
directional) antenna. The preamplifier at the base of 4 kHz signal from the GTR is present.
the antenna is powered by the DCD-LPR via the twi-
nax cable. 3.05 The receiver accepts the GPS signal informa-
tion from the GTR and sends it to an ensemble engine.
3. CARD DESCRIPTION 3.06 The GTI card ensemble averages the signal, us-
ing the oscillator inputs (from the DCD Shelf), or, in-
A. GTI Card puts from a 10 MHz external source, and performs
time correction. The corrected signal is sent to output
3.01 The GTI card forms the link to the roof-mount- drivers to provide the outputs to the timing output
ed GPS Timing Antenna/Receiver (GTR). The GTI cards.
card takes the GPS signal information from the GTR,
and, using the oscillator inputs from a DCD-500 Se- 3.07 On power-up, the GTI card output is AIS or
ries Shelf or DCD-Cs Shelf, performs an ensemble-av- squelched (user selectable). This condition persists
eraged timed correction to provide the outputs. until the GTI card has qualified all the GPS inputs,
correlated its position, and is ready for PRS operation.
3.02 GTI-11, GTI-13, GTI-15, and GTI-17 cards pro- At this point, the GTI card will have entered “GTI
vide a T1 output frequency of 1.544 Mb/s. GTI-12, LOCK” and now outputs a valid DS1 or E1 output
GTI-14, and GTI-16 cards provide an E1 output fre- synchronization signal.
quency of 2.048 Mb/s. The GTI-18 card provides an
E1 output frequency of 2.048 Mb/s, selectable via TL1 3.08 Typically, the GTI card sends an AIS signal or
command. In addition, framing formats are switch-se- squelches the output (user selectable) when a major
lectable. alarm is raised, e.g., loss of all inputs—both oscilla-
tors, and the GTR signal. All alarm and status mes-
3.03 Figure 3 shows a simplified block diagram of sages are displayed in the LCD display, and the status
how the GTI card works with the DCD Shelf. Figure 4 pushbutton on the front panel is used to step through
shows how the GTI card works with the LOU card to the LCD display screens to display time and status in-
provide output timing to the DCD Shelf. Communica- formation.
tion between the GTI card and the GTR is accom-
plished through a fiber optic link.
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TMSL 097-45100-02 Issue 10: Apr 01
LIGHTNING
PROTECTOR FIBER OPTIC CABLE
GTI CARD
RECEIVE/TRANSMIT
TIME-OF-DAY
DAUGHTER BOARD
(GTI-15, -16, -17, -18)
(Note)
GTR
DISCIPLINED TIME SCALE
POWER ENSEMBLE ENGINE
SUPPLY
GTI COMM
POWER PRIMARY RATE CONTROL
DRIVER PORT
SUPPLY
2A 2A OSC OSC
A B
FUSE AND
ALARM PRIMARY ALARMS AND TO MIS
RATE INDICATORS (DCD-500)
PANEL
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Issue 10: Apr 01 TMSL 097-45100-02
LIGHTNING
PROTECTOR FIBER OPTIC CABLE
GTI CARD
RECEIVE/TRANSMIT
TIME-OF-DAY
DAUGHTER BOARD
(GTI-15, -16, -17, -18)
(Note)
GTR
DISCIPLINED TIME SCALE
POWER ENSEMBLE ENGINE
SUPPLY
GTI COMM
POWER PRIMARY RATE CONTROL
DRIVER PORT
SUPPLY
2A 2A OSC OSC
A B
FUSE AND
ALARM LOU CARD PRIMARY ALARMS AND TO MIS
(Notes 2 and 3) RATE INDICATORS (DCD-500)
PANEL
Notes:
1. See Figure 5 for a diagram of the TOD system.
2. In the LOU-1 card, there is only one oscillator, but provides 2 parallel outputs.
3. In the LOU-2 card, both oscillators are active, but only one oscillator at a time provides timing;
oscillator A is the primary source; oscillato rB provides timing only when A has failed.
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TMSL 097-45100-02 Issue 10: Apr 01
3.12 The TOD output at the adapter is user select- Also, the user can assign output messages by TL1
able as either a Cisco Systems proprietary TOD sig- command. For details on TL1 commands, refer to the
nal, or an NTP Type 4 signal (see Table C for signal TL1 User’s Guide provided with the MIS card.
specifications).
B. LTI Card
SSM
3.14 The LTI card forms the link to the roof-mounted
3.13 GTI-17 and GTI-18 cards are SSM capable. LORAN-C antenna. The LTI card takes the
SSM messages are transmitted continuously until LORAN-C signal information, and, using the DCD os-
there is a state change determined by the GTI card. cillator (rubidium only) inputs from the DCD-ST2,
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Issue 10: Apr 01 TMSL 097-45100-02
DCD-419, or DCD-500 Series Shelf, performs an en- 3.17 The LTI card will only output AIS or squelch the
semble-averaged timed correction to provide the out- output when a major alarm is raised, e.g., loss of all
puts. inputs—both DCD oscillators.
3.16 On power-up, the LTI card outputs either an 3.20 The digital processor provides the processing
AIS signal, or the output is squelched, depending on power required to lock to a station, and sends the fre-
the user-configured setting. This condition persists quency and phase information to a phase-locked loop
until the LTI card has qualified all the LORAN-C in- subsystem in the ensemble engine.
puts, correlated its position, and is ready for PRS op-
eration. At this point, the LTI card will have entered 3.21 All alarm and status messages are displayed in
“LTI LOCK” and outputs a valid framed all-ones out- the LCD display, and the pushbuttons on the front
put signal. panel are used to step through the LCD display
screens to display time and status information.
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TMSL 097-45100-02 Issue 10: Apr 01
LTI CARD
ENSEMBLE ENGINE
2A 2A OSC OSC
(NOTE) A B
–48 V –48 V
DCD SHELF
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Issue 10: Apr 01 TMSL 097-45100-02
C. LOU Card
3.23 The GTI card takes the GPS signal information –48 V A +5 V
from the GTR and the uncorrected oscillator input DC/DC
from the LOU card, and sends the signal to an output –48 V B +15 V
driver to provide the outputs to the timing output
cards. GND GND
WARM-UP +5 V
OSC A AND OSC A OSC A –48 V A
DETECT DC/DC
–48 V B +15 V
GND GND
OUTPUT OUTPUT
DRIVER TO GTI Figure 8. LOU-2 Block Diagram
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TMSL 097-45100-02 Issue 10: Apr 01
4. SPECIFICATIONS
ITEM SPECIFICATION
DCD-LPR SYSTEM
Sensitivity Locks with signal-to-atmospheric noise level of –10 dB or better
Performance
MTIE
1 8 ns 8 ns
10 10 ns 10 ns
100 10 ns 10 ns
1000 30 ns 60 ns
Inputs The GTI-11 card accepts 5 MHz or 10 MHz from rubidium or better quality clock
cards, from ST2E or ST2 clock cards; the GTI-12 accepts 5 MHz or 10 MHz rubid-
ium or better quality clock cards, from TNC-E clock cards; the GTI-13, GTI-14,
GTI-15, GTI-16, GTI-17, and GTI-18 cards accept 5 MHz or 10 MHz inputs from
quartz, rubidium, or better quality clock cards, or combinations of the two clock
types, or LOU card; the LTI card accepts 5 MHz from rubidium clocks, from ST2E or
ST2 clock cards only.
Outputs The GTI-13, -15, and -17 provide 2 outputs: 1.544 Mb/s DS1, framed all-ones,
Superframe (D4) format or ESF
The GTI-12, -14, -16, and -18 provide 2 outputs: 2.048 Mb/s E1, framed all-ones
CCS/CAS
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Issue 10: Apr 01 TMSL 097-45100-02
ITEM SPECIFICATION
DCD-LPR SHELF
Alarm Output Audible
and Visible
Major Activates if power is lost on GTI/LTI card or if any major alarm condition exists on
the GTI/LTI card (e.g., loss of all inputs, or GTI/LTI card has failed)
Minor Activates if any minor alarm condition exists on the GTI/LTI card (e.g., a single
blown fuse or loss of a single input)
Status (VIS only) Not used
Type Dry contact
Format Normally open and normally closed
Contact Rating 1.0 A @ 56 V dc, 0.6 A @ 125 V ac
Power
Voltage –40 V dc to –56 V dc
Current Minimum 1 A
Shelf Fuses 2A
Power Source Fuses 3A
Environmental
Operating Temperature 0 °C to +45 °C
Operating Humidity 0 % to 95%, noncondensing
Dimensions (HxWxD) 13.3 cm (5.25 in.) (3 RU) x 48.3 cm (19.0 in.) x 27.9 cm (11.0 in.) overall
Note: If mounting above equipment that produces heat, leave an additional 1 RU (4.4 cm [1.75 in.]) beneath the
shelf for air flow.
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TMSL 097-45100-02 Issue 10: Apr 01
ITEM SPECIFICATION
GTI-11, GTI-12, GTI-13, GTI-14, GTI-15, GTI-16 CARDS
Input Type GTI-11 accepts rubidium or better quality, ST2E or ST2 cards only
GTI-12 accepts rubidium or better quality, TNC-E cards only
GTI-13, GTI-14, GTI-15, and GTI-16 accept 5 MHz or 10 MHz inputs from quartz,
rubidium, or better quality clocks, or combinations of the two clock types, or LOU
card
Output Frequency GTI-11, GTI-13, and GTI-15: 1.544 Mb/s (DS1), framed all-ones
GTI-12, GTI-14, and GTI-16: 2.048 Mb/s (E1), framed all-ones
Framing Format - GTI-11, GTI-13, and GTI-15: ESF or D4 (SF)
Switch-selectable GTI-12, GTI-14, and GTI-16: CCS/CAS, with or without CCS4
Environmental
Operating Temp 0 °C to +45 °C
Operating Humidity 0 to 95%, noncondensing
Dimensions (HxWxD) 4.92 cm (1.9375 in.) x 35.08 cm (13.8125 in.) x 19.37 cm (7.625 in.)
SSM Capable No
GTI-17, GTI-18 CARDS
Input Type Accept 5 MHz or 10 MHz inputs from quartz, rubidium, or better quality clocks, or
combinations of the two clock types, or LOU card
Output Frequency GTI-17: 1.544 Mb/s (DS1), framed all-ones
GTI-18: 2.048 Mb/s (E1), framed all-ones
Framing Format - GTI-17: ESF or D4
Switch-selectable GTI-18: CCS/CAS, with or without CCS4
Environmental
Operating Temp 0 °C to +45 °C
Operating Humidity 0 to 95%, noncondensing
Dimensions (HxWxD) 4.92 cm (1.9375 in.) x 35.08 cm (13.8125 in.) x 19.37 cm (7.625 in.)
SSM Capable Yes
Note: For details on TL1 commands, refer to the TL1 User’s Guide provided with the MIS card.
LTI CARD
Input Type LTI accepts 5 MHz inputs from ST2E or ST2 cards only
Environmental
Operating Temp 0 °C to +45 °C
Operating Humidity 0 to 95%, noncondensing
Dimensions (HxWxD) 4.92 cm (1.9375 in.) x 35.08 cm (13.8125 in.) x 19.37 cm (7.625 in.)
SSM Capable No
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Issue 10: Apr 01 TMSL 097-45100-02
ITEM SPECIFICATION
SSM
E1 System Quality Levels Quality Level Meaning
PRC Primary Reference Clock
DNU Do not use or idle code (no SSM message)
UNK Unknown
T1 System Quality Levels Quality Level Meaning
PRS Primary Reference Source
STU Synchronized – Traceability Unknown
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TMSL 097-45100-02 Issue 10: Apr 01
ITEM SPECIFICATION
TIME-OF-DAY (Optional)
Data Signal
Baud Rate 9600 b/s
Format 8 data bits, no parity, 1 start/stop bit
Physical/Electrical Output of Adapter:
Physical: DB9, female
Electrical: RS-422
Output of Converter (optional):
Physical: DB25, female
Electrical: RS-232
Data Format Cisco Systems:
Time format: Year/month/day, hour:minute:second
Alarm fields: Alarm severity, source, and cause where the TOD alarm codes
are defined as follows:
Alarm severity: NR = non-reporting
MN = minor alarm
MJ = major alarm
Alarm source: TOD = TOD output card
GTI = GTI
CK1 = Clock 1
CK2 = Clock 2
PW1 = primary power feed
PW2 = secondary power feed
GTR = GTR
GPS = GPS satellites
Alarm cause: ACQ = acquiring
UNL = unlocked
FLT = fault
LOS = loss
NTP Type 4:
Time format: Year Julian-date hour:minute:second:millisecond
Alarm fields: First character, sp = insync, ? = out of sync
1 pps Signal
Pulse Width 800 µs
Valid Edge Rising
Accuracy <1 µs compared to UTC
Physical/Electrical Output of Adapter:
Physical: DB9, female
Electrical: RS-422
Output of Converter (optional), DB25:
Physical: DB25, female
Electrical: RS-232
Output of Converter (optional), BNC:
Physical: BNC
Electrical: TTL
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Issue 10: Apr 01 TMSL 097-45100-02
ITEM SPECIFICATION
LOU CARDS (LOU-1, LOU-2)
Source LOU-1, one oven-controlled crystal oscillator; LOU-2, two oven-controlled crystal
oscillators
Accuracy
24 hours 3.0 x 10-10
20 years 1.0 x 10-6
Warm-up Time 30 min
Environmental
Operating Temp 0 °C to +45 °C
Operating Humidity 0 to 95%, noncondensing
Dimensions (HxWxD) 4.92 cm (1.9375 in.) x 35.08 cm (13.8125 in.) x 19.37 cm (7.625 in.)
BLANK PANEL
Dimensions (HxWxD) 4.92 cm (1.9375 in.) x 35.08 cm (13.8125 in.) x 7.93 cm (3.125 in.)
ANTENNA/RECEIVER (GTR)
Type Stable phase centered active patch
Power 16 to 32 V dc at 6.5 W
Fiber cable wave length 850 nm
Power cable between Minimum 242.7 m (minimum 1,200 ft) with GTI card providing power
GTR and power source Minimum 242.7 m (minimum 1,200 ft) with an external power source
Cable types For single lightning protector installations: one shielded 3-conductor cable, 1.47 mm
(16 AWG) with a 1.47 mm (16 AWG) built-in drain wire and one shielded 3-conductor
cable, 1.47 mm (16 AWG)
For dual lightning protectors: two shielded 3-conductor cables, 1.47 mm (16 AWG),
with a 1.47 mm (16 AWG) built-in drain wire; and one shielded 3-conductor cable,
1.47 mm (16 AWG)
200 µ multimode fiber optic cables to connect the GTR to the DCD-LPR Shelf.
Environmental (GTR)
Operating Temp Operating: –40 °C to +70 °C (cannot be started at temperatures below –20 °C)
Storage Temp Storage: –50 °C to +100 °C
Relative Humidity Up to 100%
Dimensions 29.8 cm (11.75 in.) diameter; 16.5 cm (6.5 in.) total height
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TMSL 097-45100-02 Issue 10: Apr 01
ITEM SPECIFICATION
LORAN-C ANTENNA
Type Active whip
Preamp FET type, bandpass filter, powered from receiver
Cable types Type 1 Lightning Protectors
For single lightning protector: two twinax cables, RG-108A (or equivalent) as plenum-
rated cables are required. One cable must have TROMPETER TWINAX BNC con-
nector plugs #PL30-55 (or equivalent) on both ends; one cable must have a TROM-
PETER TWINAX BNC connector plug #PL30-55 (or equivalent) on one end, and a
spade lug connector to fit 1.02 mm (18 AWG) wire, 6.35 mm (0.25 in.) wide, and fit to
a #6 stud on the other end.
For dual lightning protectors: three twinax cables, RG-108A (or equivalent) as ple-
num-rated cables are required. Two cables must have TROMPETER TWINAX BNC
connector plugs #PL30-55 (or equivalent) on both ends; one cable must have a
TROMPETER TWINAX BNC connector plug #PL30-55 (or equivalent) on one end,
and a spade lug connector to fit 1.02 mm (18 AWG) wire, 6.35 mm (0.25 in.) wide,
and fit to a #6 stud on the other end.
Type 2 Lightning Protectors
For single lightning protector: two twinax cables, RG-108A (or equivalent) as plenum-
rated cables are required. One cable must have a TROMPETER TWINAX BNC con-
nector plug #PL30-55 (or equivalent) on one end, and a spade lug connector to fit
1.02 mm (18 AWG) wire, 6.35 mm (0.25 in.) wide, and fit to a #6 stud on the other
end; one cable must have a spade lug connector to fit 1.02 mm (18 AWG) wire,
6.35 mm (0.25 in.) wide, and fit to a #6 stud on both ends.
For dual lightning protectors: three twinax cables, RG-108A (or equivalent) as ple-
num-rated cables are required. One cable must have a TROMPETER TWINAX BNC
connector plug #PL30-55 (or equivalent) on one end, and a spade lug connector to fit
1.02 mm (18 AWG) wire, 6.35 mm (0.25 in.) wide, and fit to a #6 stud on the other
end; two cables must have a spade lug connector to fit 1.02 mm (18 AWG) wire,
6.35 mm (0.25 in.) wide, and fit to a #6 stud on both ends.
Distance between Minimum 1,219 m (minimum 4,000 ft)
antenna and LTI
Environmental
Operating Temp –40 °C to +70 °C (cannot be started at temperatures below -25 °C)
Storage Temp –50 °C to +100 °C
Relative Humidity Up to 100%
Dimensions (Height) 3.3 m (10.5 ft) overall (2.4 m [8 ft] antenna, 178 mm [7 in.] conduit-T, 0.6 m [2 ft] pipe
section)
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Issue 10: Apr 01 TMSL 097-45100-02
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TMSL 097-45100-02 Issue 10: Apr 01
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24 Pages