对于多用户来说,帧中继服务提供了一个极好的性能价格比来接入广域网带宽。帧中继使得基于LAN的更高带宽应用程序在经济上具有可行性,通过集成多种网络来降低费用。然而,有远见的用户经常怀疑帧中继的能力,它是否能为SNA关键任务应用程序服务呢? ◆SNA响应时间的挑战对于局域网信道而言,公共帧中继服务被认为具有高性能,并且也是价格合理的。而对SNA信道却没有这种观点。不同于当今SNA主要运行的租用线,帧中继服务在多个用户中共享,还可在多个信道类型上共享。平均来说,帧中继在相同的费用上提供更多的带宽,但是在特定的时间内可得到的带宽却无法保障。这在许多局域网信道中是无需考虑的,因为它们主要用于客户/服务文件传输,电子邮件和软件分配,短期延迟对它们并不影响。然而,SNA信道的一个主要组成部分是互操作的主机-终端应用程序,它们的用户对在按下 For multi-user, Frame Relay service provides an excellent cost performance to access WAN bandwidth. Frame Relay makes it economically viable for higher LAN-based bandwidth applications to reduce costs by integrating multiple networks. However, far-sighted users often suspect Frame Relay’s ability to serve SNA mission-critical applications? ◆ SNA Response Time Challenges Public Frame Relay services are considered high performance for LAN channels, and It is also reasonably priced. This is not the case for SNA channels. Unlike leased lines that are primarily run by SNA today, the Frame Relay service is shared across multiple users and can be shared across multiple channel types. On average, Frame Relay provides more bandwidth at the same cost, but the bandwidth available at a given time can not be guaranteed. This is not considered in many LAN channels because they are primarily used for client / service file transfer, e-mail, and software distribution, and short-term delays do not affect them. However, a major component of the SNA channel is interoperable host-terminal applications whose users