LuxCom OM4-AVB Manuale utente
OM4-AVB
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(C) 2020 Luxcom Technologies Inc. R1.2
OM4-AVB
4 port Ethernet Switch
with Audio-Video-Bridging
QUICK START GUIDE
Description
Ethernet Audio-Video Bridge (AVB)
Supports real-time, low-latency streaming of audio and video over Ethernet.
Simultaneously bridges both AVB and regular Ethernet traffic.
Three 10/100/1000BASE-T electrical ports.
One 1000BASE-X (or SGMII) optical SFP port.
Compact rugged metal enclosure.
Uses
Professional audio/video.
Ethernet audio and video networks.
Fiber-optic connection of AVB networks without media converters.
Inter-building connection of AVB networks.
Layer 2 Ethernet switching.
Features
Precision Time Protocol (PTP) for AVB timing.
Stream reservation protocol for directing and controlling AVB streams.
USB console interface for status and configuration.
Optical SFP modules support a variety of distances (up to 100 km), wavelengths and fibers.
Bar graph shows received optical power in 2 dB increments.
Embedded Linux operating system for management.
Surge protection on RJ45 outputs for added lightning protection.
5 Year warranty as shown in the OM4-AVB manual.
Plug and Play
The OM4-AVB as shipped functions as a four-port AVB bridge.
No configuration is needed and all necessary services start automatically.
DHCP is used to obtain a local IP address for the unit.
OM4-AVB
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(C) 2020 Luxcom Technologies Inc. R1.2
Indicators
PWR Green when the micro is running.
Red when initializing or there is a problem.
RJ45 (L1-L3) Green when Ethernet link has been established.
LINK Flashing when data is transmitted or received.
RJ45 (D1-D3) Unused
O-LINK Green when optical port has a link
Optical Bar Graph
This bar graph displays received optical power. The O-LINK LED provides link status.
Each segment represents 2 dB of link margin above the low warning level.
When only 1 dB of link margin remains, only the first segment remains on and it flashes.
All segments flash when a receiver overload condition may be present.
For 1000BASE-X SFPs, the link margin is typically 12 dB or six indicators.
If all indicators are off, the optical signal is absent or weak, or an SFP without digital diagnostics
is installed.
Input/Outputs
10/100/1000BASE-T Ports
These are standard Ethernet ports with auto-negotiation. The port configuration can be changed
with the Linux ethtool application. For AVB, the port speed must be 100 Mbps or greater.
Optical SFP Port
The SFP port operates in 1000BASE-X mode and accepts SFPs designed to operate at 1 Gbps.
A variety of suitable single and multimode SFPs are available from Luxcom. Digital diagnostics
are required for the optical bar graph. PHY based SFPs are not recommended as they add addi-
tional latency and jitter. SFP module and diagnostic information can be displayed with the om4-
avb-sfp application. See the SFP Ordering Guide in the Accessories section which follows.
Power inputs
The front panel power input is used with the supplied power supply.. The rear panel input supplies
power when the OM4-AVB is mounted in RMF05 16 slot rack; it can also be powered from the
rear using the optional ADAPTER-05. Both front and rear inputs may be powered if redundancy
is desired. They both accept any voltage from 8V to 36Vdc; the supply with the highest voltage
will deliver the power.
USB Front Port (Console)
The OM4-AVB has a USB micro B console interface which connects to a USB UART. The port
settings are 115200 bps, 8 data bits, no parity, 1 stop bit and no flow control. This port provides
console access to U-Boot and the Linux operating system. See the OM4-AVB User Manual for a
full description of management commands and configuration details.
The default password for the root user is ‘luxcom’. It can be changed with the passwd command.
OM4-AVB
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(C) 2020 Luxcom Technologies Inc. R1.2
USB Rear Port (TTY/Gadget)
This USB port is used to update software. After Linux boots, it becomes a USB gadget port. It
can be used as a second Linux tty port.
The slide switch to the left of this USB should be in the unlocked position.
Micro SD Card Slot
The micro SD Card connector on the rear of the OM4-AVB can be used to expand internal stor-
age or to update the OM4-AVB software. A micro SD card is not required for normal operation.
Alarm Relay
The relay contact on the modem's rear auxiliary input closes when Linux is not running (i.e., when
the PWR LED is red). It may be used to trigger an audible or visible alarm. The alarm relay con-
tact is accessed using the ADAPTER-05 or RMF05 accessory.
Setting up an AVB Network
Setting up an AVB network is similar to setting up a standard Ethernet local area network. How-
ever, only AVB-capable bridges are allowed in the network path between endpoints. Media con-
verters can be used provided they have low jitter and latency. Typically, only PHY-based con-
verters operating at 1 Gbps will work.
Connection management software is needed to associate AVB streams. This is not supplied by
Luxcom. The OM4-AVB is mostly invisible to connection management software. However, an
endpoint may display the MAC address of the OM4-AVB in its synchronization status.
Network Size
The default neighbor propagation delay for PTP is set to 10,000 ns; this limits the maximum one-
way fiber distance to approximately 2 km. This limitation may be extended using the console in-
terface. The maximum latency should be less than 2 ms for class A networks and 50 ms for class
B networks. There should be a maximum of 7 hops.
Remote Access and Security
The OM4-AVB can be accessed remotely using telnet and ssh. It’s IP address can be deter-
mined using the “ifconfig eth0” command from the console. Both telnet and ssh can be disabled if
required. The default configuration for sshd does not allow password access for the root user.
Precision Time Protocol (PTP)
Some PTP implementations use the correction field in the header of Pdelay_Resp messages and
this may result in the nodes failing to synchronize with each other. If this occurs, refer to the
OM4-AVB User Manual for instructions on how to modify the /ptp/avb/gPTP.cfg file to work
around this issue.
OM4-AVB
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(C) 2020 Luxcom Technologies Inc. R1.2
Specifications
Electrical
Data I/O levels ................................................................. IEEE 802.3 compatible
Data I/O connectors ........................................................ RJ45
Voltage input to case ..................................................... 8V to 30V DC
Power consumption ........................................................ < 4 Watts
Relay current continuous/peak ....................................... 125/350 mA
Relay voltage AC or DC................................................... 60V peak
General
Operating temperature .................................................... 0°C to 50°C
Humidity (RH) .................................................................. 10% to 95%
MTBF ............................................................................... > 50,000 hours
Dimensions ..................................................................... 11 x 2.4 x 8 cm
Optical
See 1000Base optics in SFP Ordering Guide.
Specifications are subject to upgrade without notice.
Certification
Luxcom Technologies Inc. certifies that this equipment met its published specification at the time
of shipment from the factory.
Modem part number:
OM4-AVB Shipped with a 100-240Vac in, 24Vdc out power supply
OM4-AVBx Shipped without a power supply.
Accessories
SFP Ordering Guide is used to select and order SFP optics.
ADAPTER-05 allows rear panel Power and Alarm access.
DIN-CLIP-1 allows the modem to be snapped to a DIN rail.
MB05 bracket mounts one OM4-AVB to a flat surface.
MP05 panel holds three OM4-AVB modems in a 19” rack.
RMF05 chassis holds 16 OM4-AVB modems in a 19” rack.
Sales and Support:
Luxcom Technologies Inc.
102 Walgreen Road
Ottawa, Ontario, Canada, K0A 1L0
+1(613)831-7777
email:
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