T-VIPS CP560 - Time Synchronisation

To Next Page

To Previous Page

Functional Description 27

ID: um_t2gateway CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686)

Alarms are graphically represented in a tree structure optimized for simpliﬁed individual view-

ing and conﬁguration. The “Device Alarm” tree is available from the “Device Info” page. The

alarm tree for each port is available on the “Alarms” page for each port.

The alarm manager presents the alarm of highest severity upon the external interfaces of the

device. The severity level of each individual alarm can be deﬁned by the administrator. Alarm

conﬁguration is covered in greater detail in the “Alarm conﬁguration” section.

SNMP traps are dispatched to registered receivers whenever there is an alarm status change.

Alarm relay 1 and alarm LED are controlled to signal whenever there is a critical alarm present.

Alarm relay 2 is conﬁgurable.

The alarm manager keeps a log in non-volatile memory of the latest 10000 alarms that have

occurred.

As an additional option, the alarm manager in the CP560 supports so-called Virtual Alarm

Relays. These are highly programmable items that can be customised to react to virtually any

given alarm event or combination of alarm events. The status of each virtual alarm relay can

be viewed in the GUI and can also be exported using SNMP. Details on conﬁguring the virtual

alarm relays can be found in the WEB interface section.

5.8 Time synchronisation

The CP560 contains an internal real-time clock that is used for internal timestamps and the

generation of DVB-T2 timestamps for SFN operation.

In order to generate precises SFN timestamps, the CP560 needs to be connected to both a NTP

timesource (for absolute time in seconds) and 1PPS (for subsecond time).

The internal time can be synchronised as follows:

• From NTP servers using SNTP protocol. Up to four NTP servers can be conﬁgured for

NTP server redundancy (see section

8.4.4).

• Connect 1 PPS signal to the CP560 (see section 6.1.1) and enable 1 PPS synchronisation

(see section 8.4.6).

• Then Resync the internal time of the CP560 (see section 8.6.4.1).