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1. How many physical LAN ports do you need?

A physical LAN port is a fully independent Ethernet port with NTP/SNTP support. Each port is individually configurable and can support up to 5000 NTP packet requests per second.

How many individual LAN ports would you like fitted to your Sync Defender?

1
2
3
4
5
N/A

2. Which of the following best describes how concerned you are about the accuracy of your time server if it loses synchronisation?

Your time server could lose synchronisation for a variety of reasons (for example, during a GPS jamming event). If this occurs, your time server would use its internal oscillator to maintain its time count.

If your time server loses synchronisation, for a period of time it would continue responding to NTP requests from devices on your network. However, the amount of time the time server can reliably operate in this mode is heavily dependent on the type of oscillator installed. Depending on your application, this may or may not be an issue for you.

For most installations, the medium/standard holdover option is a good choice.

Low concern; I am not worried about unsynchronised accuracy.
Medium concern; I would like the standard holdover capability.
High concern; I would like a more accurate holdover capability.
Very high concern; my time server needs to continue operating reliably during extended periods of synchronisation loss.

3. Would you like to add a second GNSS input?

Your Sync Defender can be fitted with a dual-redundant GNSS input. This would be used as a live backup in case of a failure of the main GNSS input. Is this option of interest to you?

No, I only need one GNSS input.
Yes, I would like a second GNSS input.

4. How long will the antenna cable need to be?

Your Sync Defender will be supplied with a GPS/GNSS antenna. The antenna needs to be installed with a clear view of the sky.

How long would the cable need to be from the rear of your Sync Defender to the position where you intend installing the antenna?

Less than 3 metres (10 ft).
3-10 metres (10-33 ft).
10-25 metres (33-82 ft).
25-50 metres (82-164 ft).
50+ metres (164+ ft).

5. Will the antenna be installed in a location where it may be subjected to a lightning strike?

For reliable operation, we recommend installing the GNSS antenna outside, with a clear view of the sky. For most installations, this would normally be on the roof of your building.

Based on where you intend installing the antenna, is it possible that the antenna could be subjected to a direct lightning strike?

No, this is not possible.
This is possible, but unlikely.
Yes, and a lightning strike is highly likely.

6. Do you need a non-standard power supply option?

Sync Defender is supplied as standard with a universal mains power supply suitable for operation between 100V and 250V AC. However, alternative power supply options are available.

Do you need a non-standard power option for your application?

No, 100-250V AC mains is fine.
Yes, I need the dual redundant mains power option.
Yes, I need the DC power supply option.
Yes, I need the negative 48V DC power option.

7. Do you need any other outputs to synchronise non-networked equipment?

Sync Defender is a modular system and can be fitted with a range of expansion cards. These cards provide additional timing outputs to synchronise other equipment. Would you like your Sync Defender to be fitted with any of these option cards?

I would like to add an RS-232 level serial data and PPS output.
I would like to add an RS-485 level serial data output.
I would like to add a Pulse Per Second (PPS) output.
I would like to add an IRIG-B timecode output.

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