Model 1088B GPS Satellite Clock (40 ns) - DISCONTINUED

Setting the standard by which other precision time clocks are measured, Model 1088B features unprecedented accuracy, maximum flexibility and proven reliability.

Model 1088B User Manual
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Model 1088B Quick Setup Guide
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Model 1088B User Manual Español
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Model 1088B Data Sheet
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Model 1088B Data Sheet Español
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GNSS Antenna Data Sheet
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Leading the precision time clock industry, Arbiter's top-of-the-line Model 1088B offers unprecedented accuracy, flexibility, and reliability for applications in precision timing.

Model 1088B delivers GPS timing accuracy of 100 ns rms from UTC/USNO. Typical performance is less than 40 ns RMS. Need complete resistance to loss of GPS synchronization? The 1088B supports an interconnection to a second 1088B providing fail-safe redundancy.

If your application demands maximum versatility, look no further than the 1088B. Standard input/output (I/O) capabilities provide over 260,000 possible configurations, with 22 available signals. Featuring a second option board slot found only on the 1088B, the number of configurable options grows even further. Options include an internal Network Time Protocol (NTP), four configurable fiber optic outputs, COMTRADE Sample Rate Generator, Power System Time, Frequency and Phase Monitor, a second RS-232 port and more.

Key Features
Specs
Options
Accessories
Software
Firmware
Related Resources

More configuration options than any other clock
Highest accuracy, < ± 40 ns RMS typical; < ± 100 ns worst case
Four user configurable BNC connectors supporting multiple output functions including IRIG-B modulated, 1 PPS, Programmable Pulse, IRIG-B Modified Manchester, and more.
Fiber Optic support
NTP compatible
Two Form C (SPDT) fail-safe relays, locked and jumper selectable
Two Event Inputs (Channel A and B) included
IEEE C37.118-2005 compliant for Synchrophasor use.

Receiver Characteristics

Timing Accuracy

Accuracy Note	Specifications apply at the 1 PPS output, in the presence of Selective Availability (SA), as of date of publication.
Accuracy UTC/USNO	UTC/USNO ± 50 ns rms, when receiving 4 or more satellites and Position-Hold Mode on UTC/USNO ± 100 ns rms, receiving a single satellite and Position-Hold Mode on UTC/USNO ± 200 ns rms, when receiving 4 or more satellites and Position-Hold Mode off

Synchronization

CMOS output signals are synchronized to the 1 PPS output, ± 50 ns, maximum.
IRIG-B modulated, ± 1 us, maximum
The leading edge of the start bit of a received RS-232 data message may be selected to trigger the Event a input, providing synchronization with 100 ns resolution.

Position Accuracy

10 meters, rms, 90 % confidence

Satellite Tracking

Twelve (12) channel, C/A code (1575.42 MHz). Receiver simultaneously tracks up to twelve satellites. Results from all tracked satellites are averaged in Position-Hold Mode or, with Position-Hold Mode off, using least-squares estimation.

Acquisition

150 seconds typical, cold start
15 minutes, 90 % confidence, cold start
40 seconds, with almanac less than 1 month old
15 seconds, with ephemeris less than 4 hours old
The GPS Data Backup Battery is included in the Model 1088B. This feature improves acquisition time by supplying constant power to the real-time clock and RAM in the GPS receiver module.

I/O Configuration

Output Connectors

Four, BNC, user-configurable. Each connector is configurable as a specific input function or as any one of 22 output functions, listed below, by means of internal, push-on jumpers. Each output connector is independently buffered. Configuration is easily changed in the field. Refer to the options section for more outputs.
Analog outputs are op-amp (LF353) followers with 560-ohm protective resistors.
CMOS outputs are buffer type (74HC126) with 47-ohm source resistors.

Output Signals

Analog:

IRIG-B, 1 kHz modulated, 10 Vp-p
1 PPS deviation; ± 5 V at 10 µs/V

5 V CMOS:

IRIG-B, IRIG-E, IRIG-D, or IRIG-H, level-shift
1 PPS, 1 PPM, 1 PPH
1 PPS, 10 PPS, 50 PPS, 60 PPS, or 100 PPS
1 kPPS, 10 kPPS, or 100 kPPS
1 MPPS, 5 MPPS, or 10 MPPS
Locked
Programmable Pulse
IRIG-B Modified Manchester (IEEE Standard 1344)

Programmable Pulse Output

Four modes:

Every 1 second to 60,000 seconds, starts top of the minute
Hourly at a specified offset
Daily at a specified time of day
One-shot at a specified time of year

Pulse duration is programmable from 0.01 seconds to 600 seconds, except in one-shot mode, where the output is Low prior to the specified time and High thereafter.

Event Inputs

Two inputs are available, each having a 100 ns timing resolution. Each input may be configured to accept an external 1 PPS signal, and measure the deviation from 1 PPS/GPS or to record up to 300 sequential events (separated by 11 ms). Event data is logged in battery-backed RAM and may be read or cleared from the front panel or RS-232 interface.

Input Functions

Channel A	Event or 1 PPS: 5 V TTL/CMOS level
Channel B	Event or 1 PPS: 5 V TTL/CMOS level
Freq. Reference	5 V TTL/CMOS or AC-coupled; 100 kHz, 1 Mhz, 5 MHz, or 10 MHz

Interface

Operator

Display	2 character x 20 character supertwist LCD
Functions	Time: UTC or local Position: latitude, longitude, altitude Receiver and clock status 1 PPS (input) deviation Event time
Status LEDs	Operate (green) On Line (green) Unlocked (red) Fault (red) In addition, when Option 10 (Clock Backup Battery) is ordered: Battery Charge (green) Battery in Use (green) Battery Low (red)
Keyboard	Eight keys
Setup	Local time offset Output code select: Local/UTC Daylight Saving Time: On/Off/Automatic Backlight control: On/Off/Automatic Event input: Event/1 PPS, for each input A and B Programmable Pulse setup Antenna delay Clock offset Out-of-Lock time: 1 minutes to 99 minutes, Off, or Zero Delay Auto-Survey: On/Off, Survey duration Position Hold: On/Off, Position Auto/Manual Option Configuration and Setup Recorder output A/B Frequency Reference: standard (internal) or external Serial port: RS-232

System

Includes first serial port, second RS-232 port available (1088opt17A)

RS-232	1200 baud to 19,200 baud; 7 or 8 data bits; 1 or 2 stop bits; even/odd/no parity
Broadcast modes	Standard ASCII (IRIG-J) Extended ASCII ASCII with Time Quality ASCII with Time Quality and Year Vorne large-display time Status/Alarm Event data
Connector	Male 9-pin D-sub (TXD, RXD)

Power Requirements

Standard

Voltage	(IEC-320 Power Inlet) 85 Vac to 264 Vac, 47 Hz to 440 Hz, 20 VA maximum, 110 Vdc to 370 Vdc, 15 W maximum
Inlet	(IEC-320 Power Inlet) IEC-320 with fuse and mating cordset. Specify option P01 - P10 Available cordset plug style and specifications are described in the Options and Accessories section

General

Physical

Size	1 RU rack mount or tabletop, 260 mm deep FMS. Rack mounts included. 635 mm x 381 mm x 229 mm (25 in x 15 in x 9 in), shipping
Weight	2 kg (4.5 lbs), net 5.5 kg (12 lbs), shipping
Antenna	0.75 in pipe (1 in - 14 marine) thread Cable Connection: F-type Size: 80 mm hex (across flats) x 84 mm tall (3.2 in x 3.3 in), including connector Weight: 170 g (6 oz)
Antenna Cable	RG-6 type 15 m (50 ft) provided Weight: 0.69 kg (1.52 lbs) per 15 m

Environmental

Temperature	Operating: 0 °C to + 50 °C (- 20 °C to + 70 °C typical) Nonoperating: - 40 °C to + 75 °C
Humidity	Noncondensing
EMC	Radiated susceptibility: passes walkie-talkie test. Conducted emissions: power supply complies with FCC 20780, Class A and VDE 0871/6.78 Class A. Surge withstand capability (SWC), power inlet: designed to meet ANSI/IEEE C37.90-1 and IEC 801-4.

There are two internal option slots in the Model 1088B and options fit into two categories: those that require internal option slot space, and those that do not. Only one option may occupy the individual Option Slots. Available options are listed below and described in the Options and Accessories section.

I/O
1088opt04 ¹	Parallel BCD Output, 1 ms Resolution (1088B)
1088opt17 ¹	Parallel BCD with Second RS-232 Port
1088opt17A ¹	Second RS-232 Port (1088B)
1088opt18 ¹	Self-Monitor, IRIG-B Distribution System and Redundant Control with Second RS-232 Port
1088opt19 ¹	Out-of-lock Relay 1 Form C SPDT [1088B]
1088opt20A ²	Four Configurable Fiber-Optic Outputs
1088opt23 ²	COMTRADE Sample Rate Generator
1088opt27 ¹	8-Channel High Drive IRIG-B Output
1088opt28 ²	Power System Time, Frequency, and Phase Monitor
1088opt29 ¹	Four Additional Outputs with Dry Contact and + 25/50 Vdc
1088opt34 ¹	Network Time Protocol (NTP) / Precision Time Protocol (PTP) Server
1088opt36 ²	Four Configurable Outputs
General
1088opt01	LCD Backlight
Power
1088opt07	85 Vac to 264 Vac RMS, 110 Vdc to 370 Vdc Terminal Power Strip (1088B)
1088opt08	10 Vdc to 60 Vdc Terminal Power Strip and Surge Withstand (1088B)
1088opt15A	110 Vdc to 170 Vdc Terminal Power Strip and Surge Withstand (1088B)
1088opt15B	110 Vdc to 300 Vdc Terminal Power Strip and Surge Withstand (1088B)

¹ Uses Option Slot B
² Uses Option Slot A

All Arbiter products are shipped with standard accessories as described on each product page. Additional accessories may also be ordered during the initial sale or afterward. Contact Arbiter technical support for additional information.

Included
AS0028200	19 Inch Rack Mount Kit
AS0099200	Arbiter Universal GNSS Antenna
CA0021315 ¹	15 m (50 ft) RG-6 Antenna Cable, RoHS
P01 - P10 ²	Country specific power cord with straight female end
PD0052600	Quick Setup Guide (1088)
Available
AP0003400 ³	BNC (Male) Breakout to 100 mm Wires
AP0007700 ⁴	Modular DB-9 to RJ-11 Adapter, Preconfigured
AP0008900 ⁵	BNC (Female) Breakout to 100 mm Wires
AP0013400	GNSS Antenna Cable Splitter, F-Type, 950-2150 MHz, One Port Pass DC
AP0014900 ⁶	BNC (Female) Breakout to Screw Terminal
AP0015000 ⁷	BNC (Male) Breakout to Screw Terminal
AS0029900	Operation Manual (1088)
AS0033100	Rack Slide Kit
AS0044600	Antenna Mounting Kit
AS0044700 ⁸	21 dB In-Line Pre-amplifier
AS0048900	Antenna Grounding Block Kit, RoHS
AS0056600	24 Inch Rack Mount Kit
AS0067200 ⁴	Programming Port Cable with adapter
AS0094500	GNSS Surge Arrester
CA0019806	RS-232 Null Modem Cable, DB9F-DB9F, 2 m (6 ft) length
CA0021302 ¹	2 m (6 ft) RG-6 Antenna Cable, RoHS
CA0021306 ¹	6 m (20 ft) RG-6 Antenna Cable, RoHS
CA0021330 ¹	30 m (100 ft) RG-6 Antenna Cable, RoHS
CA0021345 ¹	45 m (150 ft) RG-6 Antenna Cable, RoHS
CA0021360 ¹	60 m (200 ft) RG-6 Antenna Cable, RoHS
CA0021375 ¹	75 m (250 ft) RG-6 Antenna Cable, RoHS
CA0022500 ⁹	Option 28 System Frequency Reference Cable, 6 m (20 ft)
CA0023600 ⁴	RJ-11 Cable Four-Pin Crossed, 2 m (7 ft)
CA0026000 ¹⁰	Power Cord IEC-320 to Bare Leads
CN0010550 ¹¹	50-Pin Parallel BCD Mating Connector
CN0027700	Type F, Male, RG-6 Antenna Cable Crimp-on Connector, non-RoHS
CN0027800	Type F, Male, RG-11 Antenna Cable Crimp-on Connector, non-RoHS
CN0050700	Type F, Male, RG-6 Antenna Cable Compression Connector, RoHS
CN0050800 ¹²	Type F, Male, RG-6 Plenum Rated Antenna Cable Compression Connector, RoHS
CN0051300	Type F, Male, RG-11 Antenna Cable Compression Connector, RoHS
TF0006000	Type F, RG-11 Antenna Cable Crimp Tool
TF0006400	Type F, RG-6 Antenna Cable Crimp Tool
TF0013200	Antenna Cable Stripping Tool, RG-6
TF0013300	Antenna Cable Stripping Tool, RG-11
TF0024000	Type F, RG-6 Antenna Cable Compression Tool
TF0024100	Type F, RG-11 Antenna Cable Compression Tool
WC0004900 ¹	300 m (1000 ft) Roll RG-11 Cable, RoHS
WC0005000 ¹	300 m (1000 ft) Roll RG-6 Cable, RoHS
WC0005200 ¹³	300 m (1000 ft) Roll RG-6 Plenum Rated Cable, RoHS

¹ Stocked length. Custom lengths available from 0.3 m (1 ft) to 300 m (1000 ft). Contact factory.
² Only applies if standard power supply is ordered.
³ Converts female BNC-terminated coaxial cable to pair of wires.
⁴ Used with retired options: Option 32 or Option 33.
⁵ Converts male BNC-terminated coaxial cable to pair of wires.
⁶ Converts pair of wires to female BNC.
⁷ Converts pair of wires to male BNC.
⁸ Used for cable lengths greater than: RG-6 75 m (250 ft) ; RG-11 100 m (328 ft). For the Models 120x: Used for RG-6 cable lengths greater than 100 m (328 ft)
⁹ Used with Option 28.
¹⁰ Used with standard power supply.
¹¹ Used with Option 04.
¹² Indoor use only. Not weather resistant. Not UV radiation protected.
¹³ Stocked length. Custom lengths available from 0.3 m (1 ft) to 300 m (1000 ft). Contact factory. Indoor use only. Not weather resistant. Not UV radiation protected.

Click to Download Latest Version of Software
Tera Term_01Jan2010_23	Terminal program that can capture data from Models 930A and 931A. Also, can program the Satellite Clocks via serial commands. Modern version is available from their website: https://teratermproject.github.io/index-en.html
Tera Term SHA256_01Jan2010_23	Tera Term SHA256 checksum

Software Version and Related Information

Terminal Emulation Program (Tera Term)

Free software terminal emulator (communications program) for Microsoft Windows.

Tera Term (Pro) is a free software terminal emulator (communication program) for MS-Windows.
Supports VT100 emulation, telnet connection, serial port connection, etc.

Tera Term SHA256

Firmware Information (EPROM based firmware is not available for download)
1088B_Firmware_02May2019	Requires an EPROM update from Arbiter.
NTP/PTP Firmware_2.08_update-00.11	Downloadable. UNZIP, read instructions, and use the web/SSH interface to import apf file(s) into unit.
NTP/PTP Firmware_SHA256_2.08_update-00.11	NTP/PTP Firmware SHA256 checksum
Power System Time, Frequency, and Phase Monitor Firmware_05Apr2012	Requires an EPROM update from Arbiter.

Firmware Version and Related Information

EPROM update (1088B_Firmware)

Version	Rev Level	Version Notes
02May2019		Updates are not security related. Fixed Option 28 serial status commands (BZ891) The commands FS, FD, PS, TD and SV did not properly return leading seconds value. Removed from PD command returned value Update copyright year to 2019.
20Oct2016		Updates are not security related. Fix leap second operation to properly warn and implement the leap second. Fix external oscillator operation if used. Default operation is internal oscillator. Front panel SETUP menu of the B7 (OPT28 1PPS) serial broadcast incorrectly included the SELECT UTC OR LOCAL BROADCAST TIME submenu. The Option 28 main menu is the correct place to set Local or UTC time for the Option 28 data. Changed the IRIG-B Daylight Saving Time (DST) pending bit to change state at xx:59:01 (was starting at xx:59:00). Now it is consistent with Leap Second Pending bit operation.
30Nov2015		Baseline code alignment with other legacy clock models. Does not affect clock operation at the outputs (BZ734).
05Nov2015		DST stop error. Not exiting DST mode properly when "day of week" value matches the first day of the following month (BZ733). Example: DST will not properly stop if DST stop was set to Last Sunday of October and November 1 is also on a Sunday. Add Option 36 as a Slot B selection
01Jul2013		Rerelease of 13Jun2013 firmware plagued by a compiler with the inane inability to determine what is an error. Option 34 update: PTP enable/disable now shows on front panel display. Enabled leap second flags, leap second application time (seconds of year), and UTC-GPS seconds offset. Fixed formatting related to the version strings. Option 28 update: Front panel configuration menu should skip to Auto Survey after Set Frequency not Option Setup (BZ717).
13Jun2013		Option 34 and Option 35 updates: PTP enable/disable now shows on front panel display. Enabled leap second flags, leap second application time (seconds of year), and UTC-GPS seconds offset. Fixed formatting related to the version strings. Option 28 update: Front panel configuration menu should skip to Auto Survey after Set Frequency not Option Setup (BZ717).
03Aug2011		Update the time quality functionality. Time quality no longer displays locked, maximum accuracy immediately after reacquiring satellites. Extended capability of existing version retrieval commands to show the Option 34/35 version information.
14Jun2011		The eight (8) channel Motorola VP receiver caused a clock reset at copyright screen (reference BZ 667). Option 28 did not fully configure using the front panel (reference BZ 668).
26May2011		Add Option 34/35 support. Add "IP" serial command to return Option 34/35 IP addresses. Add display of Option 34/35 MAC addresses Add bit to indicate if unit has ever been locked to GPS. Update NTP status screens. Fix IP command buffer and non-response issue. Fix IP address display to use periods (.) instead of colons (:).
03Jan2011		Update RD serial command output to be consistent with 1092/3 (Reference BZ489). Fix Option 28 XI serial command configuration command (Reference BZ490). Leap second pending always 0 for Motorola 8-chan receiver (Reference BZ632). NMEA GLL serial broadcast made uniform (Reference BZ633). Fix IR serial command intermittent system lock (Reference BZ644). Fix Event/Deviation screen pause (Reference BZ645).
03May2010		Removed RS-232 setup options for Option 19. The 1088B Option 19 is the out-of-lock relay and has no RS-232 functions. (BZ 613)

Downloadable Firmware (NTP/PTP Firmware)

The zip file contains all files and PDF instructions necessary to update the Network Time Protocol (NTP) / Precision Time Protocol (PTP) firmware. Reminder: Unzip the downloaded file to access the PDF instructions and individual update files.

Version	Rev Level	Version Notes
2.08_update-00.11		Updates are not security related. Released 23May2018 1. Enhancement to allow proper recognition of the Model 1202B/C in Support > Version. Support > Update Log Support > Version Core: 2.4 Auth01: 2.2 TPS UI Content: 2.5 Startup App: 1.3 System Monitor: 1.5 CLOI: 1.11 Support > Update Log should have the following entries: opt34_tps_02.08_update 00.11 Compiled Tue May 22 17:18:40 PDT 2018 opt34_tps_ui-02.05 Compiled Wed Jan 11 07:38:09 PST 2017 Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.
2.08_update-00.10		Updates are not security related. Released 01Nov2017 1. Enhancement to allow an additional port in the future. Version tab does not change. Support > Version Core: 2.4 Auth01: 2.2 TPS UI Content: 2.2 Startup App: 1.3 System Monitor: 1.5 CLOI: 1.11 Support > Update Log should have the following entry: sparky-01.07 Compiled Wed Oct 25 06:52:40 PDT 2017 Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.
2.08_update-00.09		Updates are not security related. Released 23May2017 1. Updates CLOI to 1.11. The new CLOI reduces the load on the option board CPU which allows it to serve more PTP clients. Support > Version Core: 2.4 Auth01: 2.2 TPS UI Content: 2.2 Startup App: 1.3 System Monitor: 1.5 CLOI: 1.11 Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.
2.08_update-00.08		Updates are not security related. Released: 11Jan2017 1. Updates sys_monitor-01.05. The new sys_monitor corrects a bug in the frequency tuning algorithm that results in high system time offsets on some units. Whether or not a system is susceptible to this bug depends on the initial frequency of the on-board oscillator prior to tuning. It is likely that a system showing low offset now will continue to work. However, to be safe, the update is recommended. Support > Version Core: 2.4 Auth01: 2.2 TPS UI Content: 2.2 Startup App: 1.3 System Monitor: 1.5 CLOI: 1.10 Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.
2.08_update-00.07		SECURITY UPDATE Released: 17Aug2016 Update NTP to latest release (4.2.8p8) to protect against a known vulnerability. Modified the NTP server configuration to allow correct responses to queries at a rate higher than once every 4 seconds. Fixed a bug that prevents the proper network filter configuration for vlan interfaces resulting in vlans not functioning. Fixed a bug preventing getting the OS version from the serial port Improved robustness of the update process.

NTP/PTP Firmware_SHA256

Version	Rev Level	Version Notes
2.08_update-00.11

EPROM Update (Power System Time, Frequency, and Phase Monitor Firmware)

Version	Rev Level	Version Notes
05Apr2012		The frequency was unstable off nominal frequency with an error proportional to frequency deviation. Fixed a conversion factor in the calculation. (BZ 692)
13Jul2006		Improved compatibility during transfer of correction values to option 28.

Establishing Traceability of Synchrophasors at the National Laboratory Level
Download cris2004_Establish_credibility_syncrophasor_measurements.pdf (68 kB) »

GPS Substation Clock Requirements
Download gps_substation_clock_requirements.pdf (25 kB) »

IRIG-B Time Code Accuracy, IED and System Design Issues
Download irig_accuracy_and_connection_requirements.pdf (31 kB) »

NERC PRC-002 and PRC-018 Compliance Statement
Download pd0042900a_NERC_PRC-002_PRC-018_compliance_statement.pdf (70 kB) »

Time in the Power Industry: How and Why We Use It
Download TimeInThePowerIndustry.pdf (407 kB) »

Why GPS Clocks Are Not Free
Download why_gps_clocks_arent_free.pdf (12 kB) »

App Note 101: Distributing Timing Signals in a High-EMI Environment
Download application_note_101.pdf (90 kB) »

App Note 102: Synchronizing End-to End Relay Testing with Model 1088B
Download application_note_102.pdf (18 kB) »

App Note 103: Large Format Displays with Arbiter products
Download application_note_103.pdf (16 kB) »

COMTRADE Sample Rate Generator
Download ds_comt.pdf (27 kB) »

Continual Self Calibration with Power System Time, Frequency and Phase Monitor Option
Download power_system_time_freq_phase_monitor_continually_cal.pdf (34 kB) »

GPS Antenna Mounting Bracket
Download antenna_mnt_bracket_brief.pdf (462 kB) »

GPS Antenna Mounting Bracket Instructions
Download pd0024700_gps_antenna_mounting_bracket.pdf (580 kB) »

GNSS Antenna Preamplifier Installation Instructions
Download pd0025300_gnss_antenna_preamplifier.pdf (3 MB) »

IRIG Standard 200-16
Download irig-b_200-16.pdf (857 kB) »

IRIG-B Specifications
Download irig_b_spec_brief.pdf (488 kB) »

Internal Network Time Protocol (NTP) Server -DISCONTINUED-
Download ntp.pdf (22 kB) »

Internal Network Time Protocol (NTP) Server Español -DISCONTINUED-
Download ntp_option32_espanol.pdf (129 kB) »

Option 32: Internal NTP Server Setup and Operation Guidelines -DISCONTINUED-
Download ntp_option32_english.pdf (279 kB) »

Option 33: Dual Internal NTP Server Setup and Operation Guidelines -DISCONTINUED-
Download ntp_option33_english.pdf (301 kB) »

Option 34: Network Time Protocol (NTP)/Precision Time Protocol (PTP) Server Data Sheet
Download Option34_NTP_PTP.pdf (22 kB) »

Power System Time, Frequency and Phase Monitor
Download power_system_time_freq_phase_monitor.pdf (152 kB) »

Self-Monitor, IRIG-B Distribution System and Second RS-232
Download self_monitor_irigb_distribution_system.pdf (20 kB) »

Windows^® Time Service Configuration
Download w32time.pdf (14 kB) »

Arbiter Time Service Installation Instructions
Download pd0041300_ArbiterTimeServiceInstall.pdf (382 kB) »

Chassis Dimensions
Download chassis.pdf (4 MB) »

Timing Products Options and Accessories
Download timing_and_frequency_options.pdf (36 kB) »

Model 1088A/B Firmware Upgrade Instructions
Download 1088_DST_ROM_instructions.pdf (309 kB) »

Option 28 Firmware Upgrade Instructions
Download Option28_DST_ROM_instructions.pdf (154 B) »

GNSS Surge Protector Installation Instructions
Download pd0045800_surge_protector_installation_instructions.pdf (110 kB) »

Timing Signals, IRIG-B and Pulses
Download pd0043200_timing_signals_overview.pdf (197 kB) »

Catalogo de Productos de Sincronizacion y Frecuencia
Download catalogo_de_productos_de_sincronizacion_y_frecuencia.pdf (312 kB) »

Press Release: Leap Second Anomaly December 2016
Download PD0054900_LeapSecondPressRelease.pdf (70 kB) »