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Ethernet Switches

The Q-SYS Q-LAN network uses layer 3 DiffServ QoS. This type of QoS is deployed differently on different networks and therefore requires user intervention to set up properly. Because of this complexity, un-managed switches are not acceptable for Q-SYS. List of Disqualified Switches.

Switches used with a Q-SYS system must meet the following minimum requirements:

• Non-blocking wire-speed gigabit Ethernet bridging
  • No dropped packets due to internal bandwidth constraints
  • Generates no 802.3x flow control messages
• At least 80 kB total egress buffering available for audio class of service with minimum of 40 kB dynamically available, for the audio class, per port.
• Packet forwarding decision time of 10 ms or less ¹
• DiffServ (DSCP) support
  • Minimum four egress queues per port
  • Ability to recognize and prioritize two high priority traffic classes by DSCP values or other means in addition to best-effort traffic. Refer to Prioritization for details.
  • Strict priority queuing support (weighted round robin, weighted fair queuing, or other selection methods do not provide the latency guarantees required by Q-LAN)

1. Forwarding decision time is defined as the time from end of the packet on ingress to the beginning of the packet on egress. Forwarding decidion time excludes the store-forward time due to packet length.

Qualified Switches

IMPORTANT:    The Cisco Small Business SG-300 Series has been removed from the qualified Ethernet switch list. 07/17/2013

IMPORTANT:   The Cisco Small Business SG-200 Series has been removed from the qualified Ethernet switch list. 10/27/2013

Check the QSC website for the most up-to-date list of qualified and disqualified Ethernet switches.

Disqualified Switches

Allied Telesis

• 9000 Series

Cisco

• Catalyst 2960S Series
• Catalyst 3560-CG
• Small Business SG-300 Series (Removed from Qualified list 07/17/2013)
• Small Business SG-200 Series (Removed from Qualified list on 10/27/2013)
• Small Business SG-500 Series (Removed from Qualified list on 12/18/2013)

Enterasys

• 800 Series

ProCurve

• 1810 Series
• 2810 Series
• 2910 Series
• 5300xl Series

D-Link

• DGS-3200 Series

Dell

• Powerconnect 6224, 6224F and 6248

Netgear

• GSM73xx Series

Extreme Networks

• Summit X350 series
• Summit X450e series