No 25-foot Rule for 7042 HMC
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The purpose behind the distance limitation was to facilitate work by an IBM Service Support Representative. One of the HMC's functions is to serve as a repository of service information and tools. Some service utilities, such as the ability to blink lights on and off to identify adapters, would be difficult if the HMC and the server were too far apart.
Now, the requirement is to have a browser interface within 25 feet of the managed server.
But there are some practical reasons why the HMCs may continue to be close to their managed systems. HMCs that are configured to provide DHCP service over private networks will most likely be close to their clients because of networking requirements. All high-end servers with Bulk Power Controllers require DHCP, so it is probable nothing will change in that environment. However, a 7042 could manage a remote server that uses manual IP assignment. The 7310 HMCs that manage POWER5 and POWER5+ servers with the Web-based System Manager will continue to have the 25-foot distance limitation.