topic RE: X670-G2 1588 transparent clock precision in ExtremeSwitching (EXOS/Switch Engine)

X670-G2 1588 transparent clock precision

Tierpark — Mon, 03 Sep 2018 19:55:00 GMT

Hello,

Our team is looking for a 10GE switch with 1588 transparent clock support. As we see, X670-G2 should be able to do this. However we are a bit confused by the statement in the Data Sheet:

"The X670-G2 offers Boundary Clock (BC), Transparent Clock (TC), and Ordinary Clock (OC) for synchronizing phase and frequency and allowing the network and the connected devices to be synchronized down to microseconds of accuracy over Ethernet connection."

The microsecond accuracy would be catastrophic in 1588. Each nanosecond counts here.

The "correction" field in PTP packet provides picosecond precision.

So, the question is whether microseconds is only a typo and X670-G2 really supports 1588 TC with a sub-nanosec precision?

We need the switch in a 10GE timing measurement lab, so a high accuracy is a MUST.

Thank you in advance.

Best regards,

Dmitrij.

RE: X670-G2 1588 transparent clock precision

Drew_C — Tue, 04 Sep 2018 19:03:00 GMT

Good catch. Let me see if I can get a response from engineering or product management.

RE: X670-G2 1588 transparent clock precision

Tierpark — Tue, 04 Sep 2018 19:03:00 GMT

Could we also have more precise technical specification of the "network timing feature pack"? The equipment is not cheap, we have to absolutely sure in what we buy. Thank You.

RE: X670-G2 1588 transparent clock precision

Tierpark — Tue, 04 Sep 2018 19:03:00 GMT

Hello Mr Drew,

Any news?

Best regards,
Dmitrij

RE: X670-G2 1588 transparent clock precision

Drew_C — Tue, 04 Sep 2018 19:03:00 GMT

The only update I've got so far is that we know it's at least nanosecond precision and likely better. The developer is checking test plans and qualification results to get you a better answer.