Atlona OmniStream AT-OMNI-111 Kurzanleitung

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OmniStream

AT-OMNI-121

AT-OMNI-122

AT-OMNI-512

AT-OMNI-521 AT-OMNI-232

AT-OMNI-111

AT-OMNI-112

IT Deployment Guide

AT-OMNI-XXX

Version Release Date Notes

1 08/17 Initial release

2 11/17 Added language to cover both OmniStream Pro and R-Type

Version Information

AT-OMNI-XXX

Network Topologies 4

Single Logical Switch 4

Advantages 4

Disadvantages 4

Star 5

Advantages 5

Disadvantages 5

Fat Tree 6

Advantages 6

Disadvantages 6

Layer Terminology 7

Per Stream Bandwidth Utilization 8

Scrambling 8

Redundancy (OmniStream Pro Only) 8

Video 9

FEC (OmniStream Pro Only) 9

Audio 9

FEC (OmniStream Pro Only) 10

Data 10

Trunk Bandwidth Utilization 11

Unicast vs Multicast Routing 11

Trunk Port Denition 13

Trunk Uplink 13

Trunk Downlink 15

IGMP / Multicast Routing Requirements 16

Multicast Address Assignment 16

IGMP Snooping 16

IGMP Querier 16

Multicast Routing 16

Handling of Unregistered Multicasts 17

Special Notes for networks with Dante (AT-OMNI-232) 17

Multicast DNS (mDNS) 17

Switchport Conguration 17

Jumbo Frames 17

QoS 17

PoE 18

AMS 18

Table of Contents

AT-OMNI-XXX

Network Topologies

A network topology is how the various components of a network are arranged. For our purposes, this refers to the

various devices that OmniStream is connected to and how those devices are connected to each other.

Although there are a variety of dierent network topologies, OmniStream will nearly always be connected to one of

three groups: single logical switch, star, or fat tree. Each of these topologies has its own distinct advantages and

disadvantages, which we’ll briey discuss here.

By far, the simplest network topology we will come across is that of a single switch. In this type of system, each

OmniStream device is connected to a single logical switch that is not connected to any other switches/routers.

Note that this type of topology could refer to a single physical switch, or multiple physical switches that are stacked

and act as one logical switch.

Note that this type of topology could refer to a single physical switch, or multiple physical switches that are stacked

and act as one logical switch.

• Simple.

• Easy to manage.

• Limited network impact of video trac.

• Inexpensive.

• Atlona provided conguration les available for some Cisco SG300 SKUs.

• Limited scalability options.

• No network redundancy; single point of failure.

Single Logical Switch

Advantages

Disadvantages

AT-OMNI-XXX

Network Topologies

For systems needing more scalability than that oered by a single logical switch, multiple logical switches can be

each connected to a single switch for intercommunication. In this topology, the central switch is referred to as a

“core” switch, with the other switches being referred to as “access” switches. This type of system will typically see

OmniStream connected to the access switches.

• Much more scalable than a single logical switch.

• Multiple access switches can create a level of redundancy.

• Physical network layout can make cabling very expensive, as all access switches must be directly connected to

the core.

• Single core switch creates a single point of failure.

Star

Advantages

Disadvantages

“Core” Switch

“Access” Switch

AT-OMNI-XXX

“Core” Switch

“Access” Switch

Network Topologies

Very large network systems often fall into the category of a fat tree topology. Here, access switches are connected

to a distribution switch in a manner like a star network. Multiple distribution switches are in turn connected to a core

switch. There can be multiple layers of distribution switches, and multiple core switches can be interconnected. Links

further up the tree (closer to core switches) are “fatter”, or higher bandwidth, than links further down the tree (closer

to access switches).

• Ultimate scalability.

• Potential for highly redundant networks.

• Highly complex to manage.

• Very expensive.

Fat Tree

Advantages

Disadvantages

AT-OMNI-XXX

Users often refer to switches as a “layer 2 switch” or a “layer 3 switch”, often insisting that a “layer 3 switch” is

necessary for a multicast network to function properly. This statement isn’t always true, but to understand why, the

terms “layer 2 switch” and “layer 3 switch” must be rst understood.

These terms come from the OSI (Open Systems Interconnection) model, which denes how networks communicate

by partitioning the system into layers. In this model, layer 2 refers to the data link layer and layer 3 refers to the

network layer.

As such, a “layer 2 switch” is one that performs switching on the data link layer using MAC addresses. A “layer 3

switch” is one that performs switching on the network link layer using IP addresses.

Another easy way to understand it to relate the layer terminology to a more common vernacular:

• Layer 2 switch = switch.

• Layer 3 switch = switch/router.

Layer Terminology

Network Topologies

AT-OMNI-XXX

Per Stream Bandwidth Utilization

To eectively plan a network, it is necessary to understand how bandwidth on that network will be utilized. By rst

understanding how much bandwidth each stream on each switch will utilize, it becomes easy to see how bandwidth

across the system will be utilized.

OmniStream Pro and R-Type products support AES 128 scrambling of their video and audio streams, enabling

protection of content across the IP link.

The bandwidth penalty for using scrambling is negligible and does not noticeably increase the overall bandwidth

utilization of the system.

OmniStream Pro products support redundancy of video and audio streams, allowing for decoders to automatically

detect stream failures and switch to backups.

For encoder bandwidth utilization per port, add the calculated bandwidth utilization for each session congured for

the port in question together.

For decoder bandwidth utilization per port, the calculation must be done dierently depending on the redundancy

mode used.

• Join when active – In this mode, only the active stream is subscribed, so total bandwidth utilization is the sum of

either primary or backup, using whichever stream’s utilization is higher so that worst case is calculated. Take care

to ensure that if it is possible for both HDMI’s input streams can ow on the same port, that this is included in the

calculation. For example:

»IP input 1 – 450 Mbps, ETH1, primary video for HDMI 1

»IP input 2 – 450 Mbps, ETH1, primary video for HDMI 2

»IP input 3 – 450 Mbps, ETH2, backup video for HDMI 1

»IP input 4 – 450 Mbps, ETH2, backup video for HDMI 2

»In this case, it should be gured that bandwidth per port is calculated as 900 Mbps, but the unit (both ports)

will not exceed 900 Mbps.

• Join always – As both primary and backup streams are always subscribed, the total bandwidth utilization is the

sum of all streams congured for the port in question.

Scrambling

Redundancy (OmniStream Pro Only)

AT-OMNI-XXX

Per Stream Bandwidth Utilization

Configured bitrate Used for video Used for FEC

FEC disabled 900 Mbps 900 Mbps 0 Mbps

FEC enabled, 4x4 900 Mbps 600 Mbps 300 Mbps

FEC enabled, 10x10 900 Mbps 750 Mbps 150 Mbps

FEC enabled, 20x20 900 Mbps 818 Mbps 82 Mbps

FEC enabled, 4x4 450 Mbps 300 Mbps 150 Mbps

FEC enabled, 10x10 450 Mbps 375 Mbps 75 Mbps

FEC enabled, 20x20 450 Mbps 409 Mbps 41 Mbps

Forward Error Correction (FEC) has a bandwidth penalty associated with its use. Atlona’s implementation of FEC

is per SMPTE 2022-5:2013 and does not require any extra network consideration beyond the bandwidth penalty

described here.

For video streams, OmniStream adjusts the bitrate used for video encoding automatically so that video bitrate + FEC

= congured bit rate.

FEC (OmniStream Pro Only)

Video bandwidth utilization has the most signicant impact on the network.

For OmniStream Pro units, the total bandwidth utilization for a video stream is the value congured for Bit Rate, on

the Encoding tab, of the encoder generating the stream.

For OmniStream R-Type, the total bandwidth utilization for a video stream is 900 Mbps.

Video

OmniStream Pro and R-Type PCM audio bandwidth utilization in Mbps can be calculated using this formula:

For two channel PCM formats, see the quick reference chart on the next page for bitrates.

Audio

Bitrate (Mbps) =

8 x (Sampling rate in Hz) x (Number of channels) x (4 bytes per sample)

1000000

AT-OMNI-XXX

Per Stream Bandwidth Utilization

For compressed formats, such as Dolby® Digital or DTS®, 3.07 Mbps should be used as a worst-case calculation.

OmniStream 232 Dante audio bandwidth utilization can be assumed to be 1.5 Mbps per channel.

Sampling rate (Hz) Channels Bitrate (Mbps)

32000 2 2.05

44100 2 2.82

48000 2 3.07

88200 2 5.64

96000 2 6.14

176400 2 11.29

192000 2 12.29

Atlona’s implementation of FEC is per SMPTE 2022-5:2013 and does not require any extra network consideration

beyond the bandwidth penalty described here.

Unlike video, audio FEC bandwidth utilization must be calculated if needed. Typically, as the bandwidth utilization of

audio is quite small compared to video, this is not necessary.

To calculate audio FEC bandwidth utilization, use the following formula.

As data trac is comparatively low bandwidth (typically < 100 kbps), it doesn’t signicantly impact the overall system

bandwidth utilization calculations.

FEC (OmniStream Pro Only)

Bandwidth utilization = Audio bitrate x

Rows + Columns

Rows x Columns

Data

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