How about ODF Connection?

[Michael Van]

Hi,

In my site, network cable using odf with 3 level. Example:

ODF outdoor (connection name, tenant, port, desc) -> ODF link floor (name, port) -> ODF private (name, port)

With that model, please advise me on how to deploy it in a netbox.

Regards

[Brian Candler]

Can you be more specific about exactly where each fibre terminates?  Obviously a single fibre strand can't connect to three ODF's simultaneously.

You might have for example:

- 144 fibres from outdoor ODF to link floor ODF 1

- 144 fibres from link floor ODF 2 to private ODF

- manually-added patch cables between ports on link floor ODF 1 and link floor ODF 2

Or you might have:

- 144 fibres from outdoor ODF to private ODF panel 1

- 144 fibres from link floor ODF to private ODF panel 2

How you model it in Netbox depends on the actual scenario.  In general, a pair of ODF rear ports are linked together by a cable, and the ODF front ports either connect to Interfaces on devices, or to other ODF front ports (i.e. patch cables)

The main limitation with Netbox's fibre modelling is that interfaces have only one port, whereas a standard SFP connects to a pair of fibres.

If *all* your fibre infrastructure uses fibre pairs, then you can model a fibre pair as a single "cable" and a pair of fibre connectors as a single "port".  However if you have a mixture of paired and single-fibre operation (bidi) it's tricky.  You may have to connect the SFP into the odd-numbered port and remember that the corresponding even-numbered port is reserved.

[Michael Van]

Hi Brian Candler

The end of the connection is still the device (servers, routers...). Fibres cable from suppliers will connect to ODF concentrated in meet me room (external cable room) at ground floor. This ODF is already connected to the ODF at  each floor. ODF at each floor connected to internal ODF at each server room. And finally, we will connect the cable from the internal ODF at the server room to the device.

With netbox model, a device containing cable like ODF must have corresponding front and rear ports. however, our odf has 48 pairs of front ports that correspond to a pair of 96FO fiber optic cables.

with that design, we need 3 ODF for one connection from device to out site. How can i deploy it in a netbox. 

Regards

Vào 17:37:55 UTC+7 Thứ Hai, ngày 03 tháng 2 năm 2020, Brian Candler đã viết:

[Brian Candler]

"our odf has 48 pairs of front ports that correspond to a pair of 96FO fiber optic cables"

=> 48 pairs of front ports = 96 fibres (or 48 fibre pairs)

"that correspond to a pair of 96FO fiber optic cables."

=> pair of 96 fibre cables = 192 fibres (or 96 fibres pairs)

So I still don't understand what you're saying.

[Michael Van]

Hi,

one odf has 96 FO

Regards

Vào 15:38:12 UTC+7 Thứ Ba, ngày 04 tháng 2 năm 2020, Brian Candler đã viết:

[Brian Candler]

So: a single ODF has 48 pairs of front ports and connects to a single 96-strand fibre cable.

If you use all fibres in pairs, then it's best to treat a "pair" as a single cable and port.  That is: the ODF has 1 rear port (48 positions), and 48 front ports, where each front port is really a pair of ports.  You can label those front ports as "1-2", "3-4", "5-6" etc.

If you ever use single fibres, then you treat the ODF as 96 front ports.  (There is a current limitation in Netbox that a rearport has a maximum of 64 frontports; so make two rearports, and pretend you have two 48-way cables rather than one 96-way cable)

The problem you'll find then is that an 'interface' can only take a single cable.  So you'll wire your two-port SFPs to port 1, port 3, port 5 etc, and just remember that the adjacent ports are reserved.

[xkilian]

Defining pairs works until you have a strand that is no good and you use position 1 and X instead of 1 and 2. ;-)

I would not recommend it. And same applies if not using bidi today, but then tomorrow you have to use them... There should not be artificial limitation to the optical cabling plant definition. It needs to break down to individual components.

Cheers,