按照此处的步骤操作，您应该能够重置密码。

1. Connect to the router using a RS-232 cable
2. Connect to the router via HyperTerminal
3. Settings for HyperTerminal = 9600 - 8 - None - 1 Flow Control = None
4. Power cycle the router and right away press the s key continuously until you see the login prompt > 
   (Starts up with current release but no configuration)
5. You will now have to Delete the previous manager password configuration line described below using the internal text editor.
   The editor is invoked with the command: 
   EDIT filename.cfg (filename is the name of you config file) 
   Delete the line that states: 
   set user=manager pass=3af00c6cad11f7ab5db4467b66ce503eff priv=manager 
   Save and exit editor by pressing the key sequence of Ctrl k x
6. Now, type the command >restart router to reload the original configuration. 
   The Manager password is now regenerated as "friend"

要访问串行端口，该型号的交换机需要串行端口上的特定硬件流控制才能工作 - 如果您的串行端口硬件支持，则可以在 PuTTY/etc 中启用它，或者使用两个空调制解调器 DB9 适配器背靠背。

将其重置为默认值后，通过 telnet 访问它会更容易。

从启动菜单执行“电池支持的 RAM 测试”或移除交换机内的 CR2032 纽扣电池会将其重置为默认值。

默认 IP 为 10.255.253.253/24，登录为 manager/friend。

通过 telnet 登录后，您可以通过使用命令关闭流量控制来“修复”串行端口。

“set asyn=0 flow=none outflow=none”

你可能已经不在等待答案了——但花了一上午的时间才弄明白，所以不妨把它贴出来。