Black Box ET0100A, ET1000A manual Transmitter Enable, IP Address and Subnet Mask, Default Gateway

ETEP Configuration

IP Address and Subnet Mask

Enter the IP address and subnet mask that you want to assign to the port, in dotted decimal notation.

Default Gateway

The default gateway identifies the router’s local access port, which is used to forward packets to their destination. The gateway IP address must be on the same subnet as the port’s IP address. In Figure 105, the remote default gateway is the router port 192.168.144.100. The local default gateway address is 192.168.144.1.

A default gateway IP address is required when the ETEP is in a routed network. If the ETEPs are in the same subnet with no routers between them you may leave the default gateway field blank. The ETEP determines if the packet destination is on the same subnet as the port, and if so, uses ARP to resolve the destination MAC address. If the packet destination IP address is on a different subnet, the ETEP sends the packet to the designated default gateway.

Figure 105 Remote port default gateway in a routed network

Related topic:

●“Transparent Mode” on page 306

Transmitter Enable

The ETEP can be configured to propagate a loss of signal event detected at one of its data ports to the device connected to its other data port. The ETEP performs this function by monitoring for loss of signal at the port’s receiver. For example, when the loss of signal is detected on the ETEP’s remote port, the local port transmitter is disabled, generating a loss of signal event in connecting device’s port. When the loss of signal event clears on the remote port, the local port transmitter is enabled, clearing the event in the connecting device’s port. Similarly, when a loss of signal is detected on the local port, the remote port transmitter is disabled.

Alternatively, the ETEP port transmitter can be configured to always remain enabled, regardless of the other port’s link state. In this state the ETEP can reliably recover from a link loss. But because the transmitter is always on, the appliance may inadvertently mask cable or device failures in the network.

308 EncrypTight User Guide