The Financial Industry Regulatory Authority (FINRA) regulates registered trading brokers and broker-dealer firms in the United States. The FINRA regulations
include various rules and requirements for the synchronization of clocks, which are summarized below.
FINRA Rule 4590 Synchronization of Member Business Clocks specifies that:
50ms Tolerance against NIST time for NMS securities and OTC Equity Securities, 1 second Tolerance for all others.
Clocks must be synchronized every business day before market open and re-synchronized, as necessary throughout the day.
Clock synchronization procedures must be documented.
Logs must be kept of synchronization events and any drift out of tolerance should be flagged.
Logs need to be retained for the period indicated and in the format specified under SEC Rule 17a-4(f).
FINRA Rule 6820 Clock Synchronization (Consolidated Audit Trail) includes the same synchronization tolerances as Rule 4590, but adds that:
Logs need to be retained for 5 years with the 2 most recent years easily accessible.
Members need to certify to FINRA that they meet these requirements.
Violations need to be reported according to SEC CAT NMS Plan rules
CAT NMS Plan Section 6.8(a)Ii) & (ii) and other guidance adds the following to the above requirements:
CAT Participants tolerance to NIST is 100 microseconds. Members remain at the regular tolerances as specified in Rules 4590/6820.
Participants must self-report violations that exceed tolerance for at least one second.
Members must self-report violations that exceed 2x the normal tolerance (i.e. >= 200ms)
Members must self-report any system that exceeds the tolerance 10 times in one rolling 24-hour period.
Clock granularity should at minimum be recorded/reported in milliseconds and possibly finer increments as required by NMS.
Definition of Synchronization Tolerance
The regulations allow for the use of any time source for the synchronization, as long as all
clocks stay synchronized within the specified tolerance of the NIST clock. The tolerance is defined as
including all of the following:
The difference between the NIST standard and a time providerís clock
Transmission delay from the source (Latency)
Amount of drift of the member's clock (Drift)
The total of all of the above for any clock must not exceed the specified tolerance.
How to Use Domain Time II to comply with the FINRA Requirements
Domain Time II meets or exceeds all of the specific FINRA requirements detailed above. Properly configured,
Domain Time will allow you to easily comply with all of the computer clock synchronization requirements.
Domain Time II is designed specifically to provide both accurate time synchronization and a complete history of
that synchronization. Each Domain Time II time sync component (Servers and Clients) have the ability to keep
detailed logs and statistics of their own activity - and, critically, to report that information automatically
to monitoring and auditing systems when requested.
This diagram shows the basic structure of the Domain Time II system, showing how time synchronization and audit data
collection are handled. Your time distribution hierarchy may vary.
Configuring for compliance
There are two basic steps necessary to use Domain Time II to achieve compliance:
Configure Domain Time II to provide accurate time synchronization to all clocks
Configure Domain Time II to collect and maintain sync records in an audit trail
Configure Domain Time II to provide accurate time sync to all clocks
Domain Time II, when installed according to the instructions found on the
Recommended Configurations page of the Domain Time II documentation, will meet most of the NASD requirements for time synchronization. However,
there are a few additional configuration considerations beyond the standard recommended installation instructions for FINRA compliance. Let's consider
each of the requirements and what is required to ensure Domain Time II fulfills them.
FINRA Requirement: 50ms (or 1 sec) Tolerance to NIST (or 100us if a CAT Participant) Solution: Configure Domain Time to get its time from a local hardware time appliance
It is unlikely you will be able to consistently achieve 50ms sync to NIST without having a local GPS/GNSS or CDMA-derived
time server appliance on your local network to act as your reference clock. Although you can get access to
NIST Echo Servers over the Internet,
the high load and variable latency of these servers make them unsuitable for higher accuracy. You may be able to use them
if you only need to achieve the 1-second target, however, you may find them only sporadically available.
FINRA Requirement: Regular synchronization Solution: Configure Domain Time to synchronize on a Fixed Schedule
Domain Time II Clients and Servers are background services that remain continuously synchronized with their source. Be sure to
set the synchronization period on the Timings property page of the Domain Time applet to Fixed of at least 1/minute.
This may require some trial and error to achieve the correct rate for machines that have large amounts of drift, such as virtual systems.
Synchronize more often if you machines drift outside the target. See the
Timings page in the documentation for more info.
FINRA Requirement: Synchronize every business day before Market Open Solution: If Domain Time is set to a fixed schedule (see above) it will automatically synchronize before Market Open
For example, if Domain Time is set to a fixed schedule of 1/minute, the clock will always be synched no more than 1 minute before Market Open.
How to Configure Domain Time II to collect and maintain sync records in an audit trail
The information below is based on meeting FINRA regulatory requirements, but gives a good overview of
how Domain Time II can assist in creating and maintaining an audit trail of time synchronization.
FINRA Requirement: Documentation of clock synchronization procedures Solution: Use Domain Time II documentation as necessary to write your procedures. At minimum, document which time sources you use and how often each component synchronizes with them.
Be sure to indicate the path back to NIST time (i.e. your GNSS/GPS source is traceable to NIST).
Domain Time II is thoroughly documented, and the behavior of the Domain Time II system and each time component and how it synchronizes is detailed in the
online documentation. These documents can be used to provide any level of detail of the system operation for compiling
your documented procedures.
FINRA Requirement: Keep Logs of every time a clock is synchronized and the results of that synchronization Solution: Use Domain Time II Audit Server to collect sync logs.
See the Audit Server documentation for details on
configuring and using Audit Server.
Domain Time II Audit Server is capable of collecting a log of time sync activity from Domain Time II components into
a central location for easy analysis and archiving. Information retrieved includes when a sync occurred, with whom the component
synced, and amount the clock was corrected. Log retention is configurable to match archival schedules.
Audit Server also keeps an audit record which can be used to demonstrate on-demand that any particular machine was
synchronized, with what source, and with what accuracy.
Domain Time II Server and Client also keep a local log that includes not only time sync events, but all other events
activity and events by the component. These logs can be manually collected and archived to meet the log retention requirements,
however doing so is typically much more complex than using Audit Server to do so, and results in significantly larger log files to
be archived. In most cases, using Audit Server to collect sync logs is optimal.
Suggested Configuration Changes to Audit Server
Audit Server shares Domain Time Manager's view of the network. Adjust Manager's discovery
settings to be sure you are able to see all the machines you need to audit. Be sure to Enable Auditing on your selected machines.
Set clock display granularity to your desired resolution:
Domain Time keeps clock granularity internally to the limits of the operating system, however, you may display the time with any granularity you wish.
This can be adjusted from the Manager menu. Choose Options -> Appearance and Interface -> Format Options and adjust the Significant digits to show item.
Discover machines for audit from all Domain Time II Servers:
If you want to automatically audit all machines that synchronize with Domain Time II Server (this is a very robust choice), choose
the Audit Server -> Advanced -> Audit List Management
option from the Manager menu, enable the "Add machines that have synchronized with Domain Time II Server" option and enter the list of
Domain Time II Servers you want to contact for their list.
Manually Enter Other Machines: Manually enter any machines not automatically discovered by the methods above.
Enter machines to be added one at a time by right-clicking on the category where you want them to appear on Manager's Tree pane,
or use Manager's Batch Add process for
adding multiple machines.
Enable Central Log Collection: Use the Audit Server -> Synchronization Logs -> Configure
menu item of Domain Time II Manager to collect Time Synchronization logs. Choose retention settings that correspond with your archival processes to
ensure that all logs are transferred to archival storage before being deleted from the Audit Server.
Use the Conversions -> Daily Drift CSV file for analysis and compliance:. Audit Server can compile all Synchronization (Drift) Logs into a single
Daily Drift CSV file which is ideal for complying with violation reporting or other tasks.
This file can be provided to your Compliance Department for their use in compiling the necessary reporting forms and documents.
The Daily Drift CSV file can also be configured as an exception report, which only shows machines that have violated your alert thresholds. You may
find this more useful than providing the entire drift data to compliance. To enable this function, select the
Only include error records - omit all records within defined tolerances checkbox on the CSV File Configuration dialog.
FINRA Requirement: The log should include notice of any time the clock drifts more than 50ms second from NIST time. Solution: Domain Time II Audit Server has the capability to generate alerts when any monitored system's variance from a reference clock exceeds a threshold
you set. Warning entries of these events are also included in the logs.
Audit Server can compare the sampled time of any audited machine to a reference clock. The reference clock's time
is used to calculate certain variances and alerts. By default, Audit Server shares the Reference Clock settings of Domain Time II Manager.
Since FINRA specifies that variances by shown in relation to NIST, the reference clock setting
on Manager must be changed to include a clock with as short a path to NIST time as possible (preferably a NIST server or a clock derived directly from it, such as a GPS time source).
Audit Server has the ability to generate an alert if the time variance on any system exceeds a particular threshold.
The FINRA-specified requirement is that the log for any machine drifts outside 50ms from NIST time should include
a notice to that effect. Audit Server will automatically add a warning to the log when any machine exceeds the
Any machine time off by... setting on the Audit Server Alerts dialog page.
Required Configuration Changes to Audit Server Set the Reference Clock to NIST sources: Use Manager's Options -> Network Options -> Reference Time...
menu selection to set the Reference Clock setting to use at least, preferably more of the official NIST Servers
(note, you must have the NTP port 123 UDP open on your firewall to allow Manager/Audit Server to contact a NIST time server).
You may also choose reliable local NIST-derived clocks, such as a GPS receiver.
Note that if your Audit Server is synchronizing via PTP to a GPS/GNSS synchronized Grandmaster, you may set the Reference Clock to "Use this machine's clock" as recommended in the configuration documentation.
This still maintains traceability to the NIST source.
Set the Alert Threshold: On Audit Server's Alerts dialog page, make sure the Any machine time off by setting
is set to 50ms or less.
FINRA Rule Requirement: Logs must be maintained and preserved for the period of time and with the accessibility specified in
SEC Rule 17a-4(b) Solution: Use Domain Time II to collect audit logs and sync data and archive as necessary.
Rule 4590 specifies the retention period for this type of record is 3 years, the most recent 2 years of which must be in an easily accessible location.
Rule 6820 specifies the retention period for this type of record is 5 years, the most recent 2 years of which must be in an easily accessible location.
The Domain Time II Audit Server automatically collects detailed time synchronization data from the network into local disk storage.
You may choose to keep the records locally or archive them into offline storage.
FINRA Rule 4590 Requirement: Logs must be maintained in a format permitted under SEC Rule 17a-4(f)
Domain Time II does not directly address the specific provisions of this regulation (such as the use of non-erasable storage for
electronic data records), however it does provide the data in an easily collected and stored manner that can be transferred to your required format.
Violation self-reporting under CAT NMS. The Daily Drift CSV file can be used by your
Compliance Department to determine if violations have occurred and provide the necessary documentation of events.
This document is provided for informational and planning purposes only. The information used in compiling this document was obtained from
publicly available sources and no representation is made as to the accuracy of the information, nor
as to the accuracy of any reading or interpretation thereof. No warranty is made or implied regarding the usefulness or suitability
of this information for a particular purpose. Further, Greyware Automation Products, Inc. is not liable for any damages, real or
consequential, arising from use of this information.