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Echo LANlink Router Option User Manual Issue 1.0 04 December 1997 Page 8 of 59
the Branch Office could access the Headquarters General Server via the
Echo LANlink, but accesses to the Finance Server could be stopped using
subnet masking in the Echo LANlink.
Figure 2 Restrictive Firewall Example
In addition to the features of the router, all the existing functions of the Echo
LANlink are still available. This means that as well as connecting two remote
LANs, the Echo LANlink can also carry PABX voice traffic (using D&I option
card or ADPCM option card), and data traffic between the two sites, all
simultaneously multiplexed onto one E1 communication link.