Time and date synchronization

Overview

Synchronizing the time and date among all NEs in a network is useful to correlate events reported by different NEs.

The time and date is synchronized:

• Manually using the WaveStar^® CIT Administration → Set Date and Time command.

• Automatically from another NE via the DCC.

• Automatically by the OS

Provisioning

In a new installation, it is recommended that the time and date be manually provisioned in at least the first Alcatel-Lucent 1665 DMX in each ring. Each subsequent Alcatel-Lucent 1665 DMX that is added to the network tries to learn the current time and date from one of the existing NEs automatically.

After start-up (or any subsequent controller resets), the Alcatel-Lucent 1665 DMX's time and date revert back to the last time and date before the reset. Alcatel-Lucent 1665 DMX waits 5 minutes, in case other NEs are also resetting (for example, as part of a software upgrade of the network), before starting to check with other NEs for the current time and date. If necessary, the Alcatel-Lucent 1665 DMX checks with all remote NEs for the current time and date.

Alcatel-Lucent 1665 DMX allow up to 2 minutes for each remote NE to respond before checking with the next remote NE for the current time and date, and keep checking until a valid current time and date is found.

Alcatel-Lucent 1665 DMX accepts a provisioned time and date value or any remote NE date later than 00-01-01 as a valid current time and date.

Network time protocol

Network Time Protocol (NTP) assures accurate synchronization of Alcatel-Lucent 1665 DMX with reference to radio and/or atomic clocks located on the Internet.

Considerations

The automatic time and date synchronization is intended to achieve time and date synchronization among compatible NEs with DCC connectivity in a network, but such synchronization can not be guaranteed at start-up for all network configurations or over the course of time.

TL1 command responses and autonomous messages include Alcatel-Lucent 1665 DMX's current time and date. As an alternative to manually provisioning and confirming the current time and date in each Alcatel-Lucent 1665 DMX in a network, OMS, automatically checks the current date and time, periodically or on-demand.

Time and date synchronization compatibility

The following table lists Alcatel-Lucent 1665 DMX Time date Synchronization compatibility with other products.

Table 5-21: Time and date synchronization compatibility

Products	Alcatel-Lucent 1665 DMX
Alcatel-Lucent 1665 DMX	yes
Alcatel-Lucent 1665 DMXplore	yes
Alcatel-Lucent 1665 Data Multiplexer Extend	yes
DDM-2000 OC-3	yes
DDM-2000 OC-12	yes
FiberReach	yes
FT-2000 ADR	yes