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In this guide we look at how the ET-100A Ethernet bridge can be used to bridge Ethernet data over a serial leased line but we're also going to go one step further and use the FRM220-DATA to create our own serial leased line and then deploy serial cryptographic devices to encrypt the data being transmitted.
We want to provide the fastest speed possible between the 2 LAN's but the crypto are limited to E2 speeds of 8.192Mbps so we'll need to configure our link to accommodate this. As this is a synchronous serial link we'll need to designate 1 device to act as the master clock source.
Typically the leased line would provide clock out to end devices so we'll make 1 of our FRM220-DATA's the master by configuring its clock to be internal and setting the speed to 8.192Mbps. The other FRM220-DATA will be configured to 'recovered' clock deriving its clocking information from data received in on its fibre optic interface and again setting the speed to 8.192Mbps.
The two ET-100A's can be identically configured. Their clocks are set for external and their speed is configured for 8.192Mbps. Their LAN interfaces are set to Auto negotiate speed and duplex and the WAN Layer 2 protocol is configured for HDLC.