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Cisco PGW 2200 Softswitch

Field Notice: FN - 62889 - New Zealand Daylight Savings Time Policy Changes Effective September 2007 For Cisco PSTN Gateway (PGW2200)


August 27, 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

Product

Products Affected

PGW2200 - 9.3X

PGW2200 - 9.4X

PGW2200 - 9.5X

PGW2200 - 9.6X

PGW2200 - 9.7X

 

Problem Description

The operating systems of most Cisco products that support Daylight Savings Time (DST) have built in mechanisms to automatically change the times, based on current user-selected rules. Once the new DST is implemented, the time on devices that maintain time zone information will continue to change according to the old method, unless changes are made.

Background

On April 30th, 2007, the Minister of Internal Affairs issued a statement regarding a change in Daylight Savings Time policy for New Zealand. The change in policy has modified the start and end dates for DST. Beginning in 2007 and beyond, Daylight Savings Time in New Zealand will start on the last Sunday of September at 2 AM local time and end on the first Sunday of April at 3 AM local time.

Specifically for 2007-2008, DST will begin at 2 AM local time on September 30th, 2007, and end at 3 AM local time on April 6th, 2008.

For more information, see the statement issued by the Minister of Internal Affairs.

The previous Daylight Savings Time policy for New Zealand dictated that DST start on the first Sunday in October and end on the third Sunday in March.

Problem Symptom

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

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

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

showrev ?p

The following patches can be downloaded from the SunSolve Online page by searching for the patch number:

  • SPARC Platform with Solaris 8 requires Sun patch 109809-07 or later

  • SPARC Platform with Solaris 10 requires Sun patch 122032-05 or later

  • x86 Platform with Solaris 10 requires Sun patch 122033-05 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

CSCsj75847 (registered customers only)

Sun patches are needed for New Zealand daylight saving issue.

 

Revision History

Revision

Date

Comment

1.0

27-AUG-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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