Network Implementation Guide › Troubleshooting › Bypass Relay

Bypass Relay

There are some configuration issues that need to be considered in order to ensure error free operation when the NBA is in a failed state with the LAN bypass relays closed.

Note: We strongly recommend that you test both 'normal' and 'failed' bypass states before deploying the NBA.

Maximum Cable Length

When the bypass relay is closed, the two network cables are electrically joined together to form a single cable. Make sure that the combined length of the two cables does not exceed the normal maximum length for a single LAN cable when the relay is operational.

Crossover or Straight Through Cables?

Consider whether to use crossover or straight through cables to make sure the network link continues to operate when the bypass relay is closed. This decision depends on the configuration of other equipment that the NBA is attached to.

Port Speeds

To minimize any network disturbance, the ports on the NBA and other equipment that it is attached to must all have the same speed and duplex settings to avoid auto-negotiation delays if an NBA failure occurs.