SN Shuttered Adapter SC Footprint

What the SN shuttered adapter SC footprint is

The SN shuttered adapter SC footprint is an adapter body for the SN connector, a very small form factor duplex connector, built with the outer shape of an SC-style adapter so it drops into panels and bulkheads that were cut for SC. Inside, it holds two or four SN duplex channels, which means four or eight fibres. Each channel has a shutter that closes when no connector is plugged in.

It is one of several SN adapter bodies. The wider range is described on the SN connectors hub page, and the whole this range that Radix can supply is listed on the these connectors overview. The reason this body exists is practical: many data centres and telecom rooms already own thousands of SC-sized openings. Re-cutting metalwork is slow and it changes the panel. A body that fits the existing opening lets the fibre density go up without touching the chassis.

The manufacturer gives typical insertion loss of 0.10 dB and a maximum of 0.20 dB for its SN adapters, an operating range of -40 to +75 C, resistance to 95 percent humidity, and 200 matings under GR-326-Core. The sleeves are precision zirconia. Treat these as maker figures and ask for the data sheet that matches the exact order.

Where a shuttered SC-footprint body fits in a panel

An SC-sized opening is a common standard across patch panels, wall boxes and optical distribution frames. The shuttered SN body is meant for those places. You put the adapter in the opening, you plug SN duplex connectors in from either face, and you get a two-fibre or four-fibre run per channel.

The shutter has two jobs. It keeps dust out of the open sleeve when a channel is not in use, and it blocks light from an active transmitter, which is a safety point when ports are live. Both are routine reasons to choose shuttered adapters on a front panel that technicians touch often. A shutter is not a substitute for a dust cap on a loose connector, and it does not make cleaning optional.

The 2-channel and 4-channel versions sit in the same outline. Pick 4-channel where the aim is density, and 2-channel where you want fewer fibres per opening, for example on a panel that will be filled slowly. The mixed approach is common: 4-channel in the dense rows, 2-channel at the edges of a build.

If you are weighing this against the standard-footprint shuttered part, read the page for the standard SN shuttered adapter alongside this one. They share the SN connector, so the choice is about the panel, not the plug.

Choosing the variant: channels, fibres and sibling parts

Where the table says "per data sheet", Radix does not quote a figure here. The point of the table is the decision path: shutter or not, then panel outline, then channel count.

Cleaning and handling with shutters

A shutter closes the path for dust when a channel is empty. It does not clean the end face of a connector you are about to insert, and it can carry its own debris on the inside of the flap. Inspect and clean every connector end face before it goes into the sleeve, as the end face cleaning and inspection guide describes.

Very small form factor connectors have little room for a finger or a tool. Allow for the width of your fingers when you plan the density of a panel. Push-pull style boots help in tight rows, and you should still leave space to pull a connector straight out, not at an angle, so the ferrule does not scrape the sleeve.

When a channel will stay empty for a long time, leave the shutter closed and do not prop it open with a probe. If you must inspect a port, use a probe made for the SN size and close the shutter after. Keep a record of which ports are live before you open any channel.

Worked example: retrofitting an SC-sized panel

Assume a 1U panel has 12 openings cut for SC adapters, and the data sheet confirms the 4-channel SN body fits that outline. These are assumed figures for illustration, not a Radix quotation.

• With 4-channel adapters: 12 openings x 4 channels x 2 fibres = 96 fibres in the same panel.
• With 2-channel adapters: 12 x 2 x 2 = 48 fibres.
• A mixed fit of 8 four-channel and 4 two-channel adapters gives 64 + 16 = 80 fibres.

Now add a loss check. A link with two mated pairs uses the adapter loss twice. At the manufacturer typical figure of 0.10 dB, two adapters contribute about 0.20 dB, and at the 0.20 dB maximum, about 0.40 dB. Put the maximum figure in the loss budget for a worst case, and the typical figure for expected performance. Connector loss in the plugs themselves is added on top.

The saving is real only if the connectors, trunks and cassettes behind the panel also move to SN, so cost the whole chain, not the adapter alone.

Compatibility with SN connectors and what to confirm

The adapter takes SN duplex connectors on both faces. The manufacturer states that SN Uniboot is only compatible with the standard SN footprint 4-channel adapters, so do not assume it mates in an SC-footprint body. Check before ordering the SN Uniboot connector with this adapter. The other SN connector styles, such as the SN 1.6 mm standard connector, are covered on their own pages.

Also confirm these points with the data sheet:

• The exact external dimensions and fixing method of the SC-footprint body against your panel.
• Whether the body is for single-mode, multimode or both, and the sleeve and colour coding that go with it.
• UPC or APC polish matching on both sides. Mixing polish types damages end faces. The UPC vs APC guide explains why.

Where an SN link ends in a transceiver cage instead of a panel, the SN gang clip for transceivers is a related part, not a substitute for this adapter.

When this is not the right part

• The panel is LC-based and has no SC outline. Use an LC adapter or a standard SN body. See the LC connectors and adapters page.
• You need one separated channel for coherent optics. The SN non-shuttered adapter offers a single channel (2 fibre) and suits that case better.
• You use 16-fibre MT based links. That is the SN-MT family, with its own adapters, on the SN-MT connectors page.
• The environment is wet or dusty outside a room. A shutter is a convenience, not a seal. Look at the IP-rated harsh environment connectors instead.
• The network stays on LC duplex for years. Density that you will not use is cost without return.

Buyer checklist and what to send Radix

Radix can supply this adapter loose, or fitted to a panel or cassette to your drawing. For a quotation by form, phone or WhatsApp from Pune, send:

1. Quantity of adapters, split by 2-channel and 4-channel.
2. Fibre type, single-mode or multimode, and polish, UPC or APC.
3. Panel make and model, or a drawing of the opening.
4. Whether shutters are needed on every channel.
5. The connector style you plan to plug in, for example Uniboot or standard SN, and the boot colour you want.
6. Any cords or assemblies to be built with it, with length and cable outside diameter.

Radix tests each cord before dispatch. Use the request a quote form or call +91 99702 02526 in office hours. For cords with SN ends, see custom fibre optic assemblies.