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Cisco Signaling Controllers

Field Notice: FN - 62687 - US Daylight Savings Time Policy Change Effective March 2007 - for Cisco PSTN Gateway (PGW2200)


Revised March 1, 2007

February 22, 2007

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Products Affected

PGW2200 - 9.3.X

PGW2200 - 9.4.X

PGW2200 - 9.5.X

PGW2200 - 9.6.X

PGW2200 - 9.7.X

Problem Description

New U.S. Daylight Savings Time rules go into effect in March 2007. PGW2200 systems that have not been updated with the new DST policy changes will exhibit a one hour time clock offset lasting 3 weeks beginning at 2:00 A.M. on the second Sunday in March of 2007. They will also exhibit a one hour time clock offset lasting one week beginning at 2:00 A.M. on the first Sunday in November.

Background

On August 8, 2005, the Energy Policy Act of 2005 (H.R.6.ENR) was signed into law. Section 110 of this Act modified the time change dates for Daylight Saving Time (DST) in the US.

Beginning in March of 2007 and beyond, DST will begin on the second Sunday of March at 2:00 AM and end the first Sunday of November at 2:00 AM.

For more information on the Energy Policy Act of 2005 (Section 110), see H.R. 6.

Problem Symptoms

Call Detail Records (CDR) get their time based on the time setting in PGW2200. To show the correct time when DST changes in March and November 2007, the correct dates need to be specified on a yearly basis if your area changes time for DST.

Impact to Networking Systems:

Networking systems often make use of local time to mark logs, as well as to schedule certain events, such as IP SLA schedule starts, or the beginning or end of a time-based access-list.

In addition, inconsistencies between time zone definitions may impact event correlation systems as well as other management systems relating to problem escalation. Having accurately represented local time is a very big concern for most organizations. Local time may be reflected in logs and on phone displays. This is especially true of systems that require accurate time and time stamping for proper operations.

For networking systems, the clock or clock source is often derived from a trusted chronological source such as a private or public Atomic clock, often through Network Time Protocol (NTP). NTP communicates time in Coordinated Universal Time (UTC), colloquially known as GMT, and thus is not impacted, nor is a workaround for statutory time zone changes. Local time definitions, including summertime settings are part of the configuration of most Cisco products.

Workaround/Solution

General guidelines to verify if your platform has the proper Solaris time change packages are:

Solaris time change patches will be supported in Solaris 10.

To verify the correct patches are installed, customers can execute the following UNIX command:

showrev -p

Customers falling into one of the listed categories should prepare and execute towards one of the following application(s) upgrade recommendations:

  • SPARC Platform

    Solaris 8 with patches 109809-02 or later and 108993-52 or later

    These patches are in release 2.0(17) which is available at the Download MGC Node Solaris 8 Packages (registered customers only) page.

    Solaris 10 with patches 122032-01 or later and 119689-07 or later

  • x86 Platform

    Solaris 10 with patches 122033-01 or later and 121208-03 or later

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCsh37721 (registered customers only)

Sun patchs are needed for daylight saving issue

Revision History

Revision

Date

Comment

1.1

01-MAR-2007

Added link to download version 2.0(17) to Workaround/Solution section.

1.0

22-FEB-2007

Initial Public Release

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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