Mushroom Networks Documentation

Can you discuss the Streamer VOM Status Table?

The VOM Status Table is located at the bottom of the VIDEO tab. A typical screenshot is shown below:

The VOM status table is updated approximately once every 5 seconds. The top row of the status table shows summary information.

 

Name & Connection Status:

In the leftmost column, the assigned Name of the Streamer is shown. The Connection Status of the Streamer unit is shown. If the unit is currently peered with a Relay Unit, the indication will be “Yes”, as is shown in the example. If the Streamer unit is not currently peered with the Relay, “NO” is shown. This could be due to the fact that the Relay is not powered on or currently connected to the Internet, or due to a network connectivity issue.

 

Time Offset:

Also shown is a time offset value in units of milliseconds. This is the current estimated one‐way delay between the Relay and the Streamer unit. Under normal operating conditions, the value should not exceed a few hundred milliseconds and may be slightly negative due to time offsets. A relatively large value of the time offset value is generally indicative of a time synchronization problem between the Relay and Streamer, or an indicator of network congestion in the downlink direction. A time offset value of ‐49 ms is shown in this example.

 

Media Input:

An important value to monitor is the Media Input rate. In the illustration above, this value is 479 kbps. This is the current measured bit rate of the encoded video signal. In particular, if the reported media input rate is 0 kbps, this is an indication that either there is not a valid video source present, or a possible problem with the current encoder configuration.

 

Output (BPA):

Also shown is the current media Output (BPA) rate, as last reported by the Relay. If the video stream is currently present, this will generally be a non‐zero value greater than 200 kbps. In the illustration the Relay (BPA) output rate is reported at 435 kbps. Due to the play‐out delay, the instantaneous Relay Unit output rate should be a delayed version of the media input rate. As a result, the instantaneous media rate and the instantaneous Relay output rate will generally be different, but in normal operation they are about the same size on average. If the Relay rate is 0 kbps, this could be because no video signal is present. If the media input rate is non‐zero but the Relay output rate is persistently 0 kbps or close to 0 kbps, this is generally an indicator of insufficient uplink network bandwidth. In this case, the integrity of each USB modem should be evaluated by closer examination of the data in the table, to determine the possible source of the problem.

 

Sender Delay:

The current Sender Delay, in units of milliseconds, is also reported. This is defined as the current time delay of the latest packet to enter the Streamer unit. Under normal operation, this value should generally stay below the Play-out Delay. If the Sender Delay rises above the Play-out Delay, this is an indication that the video bandwidth is too high relative to the total amount of uplink bandwidth available, which can be addressed by reducing the output video rate of the encoder.

If the Sender Delay increases beyond the Play-out Delay, the output video will not play smoothly.

If there are temporary bandwidth reductions, this can be dealt with by increasing the Play-out Delay by a sufficient amount. Play-out Delays of up to 5 minutes (300000 ms) are supported.

 

Uptime:

The Uptime is also reported, which is the amount of time the Streamer unit has been powered on and running the VOM module.

 

Media Transported:

The value of Media Transported is the total number of media bytes transferred since the Streamer unit has been powered on. In the illustration, this value is 4.3M bytes.

 

Version:

The Software Version is also displayed in the top row of the VOM status table.

 

USB Modems:

For each active USB modem, there should be a row in the VOM status table. In the illustration, there are 4 such rows, corresponding to the 4 USB modems that were plugged in and active at the time. In the leftmost column are shown the slot locations of the active modems. In the example illustrated, the modems are using slots 1, 2, 3, and 4.

Also shown in the VOM status table is the Carrier name and Modem type for each USB modem. This is provided to the user for identification purposes, to facilitate management of the multiple modems. The column titled Modem Address lists the current external IP address that is assigned to each modem.

 

Destination IP:

Shown in the rightmost column. This is the destination IP address and destination port number for traffic leaving the given USB modem.

 

Source IP:

Shown in the leftmost column. This is the sender LAN IP and source port of the Client Device.

 

Uplink Rate:

In the Uplink Rate column are the last reported arrival rates of traffic to the Relay Unit from each modem in units of kbps. Adjacent to the Total entry is the sum of all the uplink rate values. This is an indicator of the total amount of uplink network bandwidth available, when a valid video source is present. When a video source is not present, the total uplink rate will be a small nominal value, corresponding to an idle condition. The video output resolution may need to be adjusted, depending on the total amount of network bandwidth available, as discussed earlier. In the example illustrated, there is about 1.4 Mbps of uplink network bandwidth available.

 

Latency:

The most recently measured round‐trip latency in units of milliseconds is also reported for each USB modem in the column labeled Latency.

 

Media Uploaded:

This gives the total amount of data uploaded for the given video session when a video stream is present.

 

Session Duration:

The Session Duration displays the duration time of the video session.

 

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