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# Configure SMPTE ST 2110 input

## Limitations and Considerations for ST2110 and PTP

The following limitations apply to the current version:

* ST 2110 streams are carried over RTP. RTP header extension is not supported and should be turned off on the source, as described here: [https://datatracker.ietf.org/doc/html/rfc3550#section-5.3.1](https://datatracker.ietf.org/doc/html/rfc3550#section-5.3.1).

* PTP domain of value 0 is the only domain supported. A workaround is to manually set the value in a file.

* ST 2110 support is limited to HD resolutions.

* SMPTE ST 2110

SMPTE ST 2110-20 uncompressed video up to UHD resolution

* SMPTE ST 2110-30/31: uncompressed audio

* SMPTE ST 2110-40: data (VITC/Time code, AFD/BAR, Closed captioning, OP-47 Teletext, SMPTE 2031 Teletext)

* All SMPTE ST 2110 essences can be input as ST 2022-7

* NMOS IS-04 and NMOS IS-05 support

## Configure SDP files on MK.IO Beam

ST 2110 can be configured using SDP files on the **Input** tab of the Live Encoder component (see [Configure an SMPTE ST 2110 input](/beam/contribution/configure-feed-components/live-encoder#smpte-st-2110-input)).

The SDP files can be entered either as:

* A URL where the SDP files can be retrieved from.

* A path to the location of the file stored on the server:

On the host, the SDP file(s) need to be in the `/var/appliance/assets` directory.

* When configuring the Encode service, use this directory to specify the SDP file location.

SDP files can be transferred to the server either by SSH or by uploading via the UI.

If the Asset Management feature is enabled, follow these steps:

* Navigate to the Asset Management > Assets page.

* Click Add to add a new asset.

* Select the SDP file, then check the Protect the Asset when it is uploaded checkbox.

* Click Start Upload to upload it.

If the Asset Management feature is not enabled, follow these steps:

* Copy the files to the server via SCP. For example, using Mobaxterm:

```shell
scp /cygdrive/c/sdp-2110-20.sdp mfeng@192.168.1.1:/tmp

```

* Connect to the unit via SSH and copy the files to `/var/appliance/assets`:

```shell
sudo mv /tmp/sdp-2110-20.sdp /var/appliance/assets

```

After copying over the SDP file, configure it on the Live Encoding service user interface using the following path: `/var/appliance/assets/sdp-2110-20.sdp`

## Configure PTP for ST 2110

PTP is required for ST 2110 operation.

### Set the PTP interface and domain

PTP interface configuration is under the **System Settings** page.

* Navigate to the Servers view.

* Click the Details  button to display the server information.

* Go to the System Settings tab.

* Under Time sources, select the PTP tab.

* Set Interface to the network interface which will connect to the PTP Grand Master.

* Set Domain number to the required PTP domain.

If the system time source is not set to PTP, click the **Make active** button to set this.

Confirm all changes by clicking on **Confirm,** then click the **Save** button at the bottom of the page to save the changes.

## Checking PTP operation

### How to check that PTP services are running

To check the p4p4l service:

```shell
systemctl status ptp4l.service

```

The output from this command should show that the service is loaded and active, for example:

```shell
ptp4l.service - Precision Time Protocol (PTP) service
Loaded: loaded (/usr/lib/systemd/system/ptp4l.service; enabled;
vendor preset: disabled)
Active: active (running) since

```

To check the phc2sys service:

```shell
systemctl status phc2sys.service

```

The output from this command should show that the service is loaded and active, for example:

```shell
phc2sys.service - Synchronize system clock or PTP hardware clock (PHC)
Loaded: loaded (/usr/lib/systemd/system/phc2sys.service; enabled;
vendor preset: disabled)
Active: active (running) since

```

### How to check the PTP Grand Master

Run the pmc tool to check the status of the PTP grand master.
In the example below, PTP domain 0 is used (`-d 0`).
Modify the “`-d`” option to specify a different PTP domain.

```shell
sudo pmc -u -b 0 -d 0 'GET TIME\_STATUS\_NP'

```

The text `gmPresent true` confirms that the grand master is detected, for example:

```shell
    sending: GET TIME_STATUS_NP
      043f72.fffe.ff60cb-0 seq 0 RESPONSE MANAGEMENT TIME_STATUS_NP
             master_offset 13
             ingress_time 1620380188201784144
             cumulativeScaledRateOffset +0.000000000
             scaledLastGmPhaseChange 0
             gmTimeBaseIndicator 0 lastGmPhaseChange 0x0000'0000000000000000.0000
    gmPresent true
             gmIdentity b8599f.fffe.60ffc8

```