text: """MRV Communications Driver (OptiSwitch)."""
  from __future__ import unicode_literals
  import re
  
  from netmiko.cisco_base_connection import CiscoSSHConnection
  
  
  class MrvOptiswitchSSH(CiscoSSHConnection):
      """MRV Communications Driver (OptiSwitch)."""
      def session_preparation(self):
          """Prepare the session after the connection has been established."""
          self._test_channel_read(pattern=r'[>#]')
          self.enable()
          self.set_base_prompt()
          self.disable_paging(command="no cli-paging")
  
      def enable(self, cmd='enable', pattern=r'#', re_flags=re.IGNORECASE):
          """Enable mode on MRV uses no password."""
          output = ""
          if not self.check_enable_mode():
              self.write_channel(self.normalize_cmd(cmd))
              output += self.read_until_prompt_or_pattern(pattern=pattern, re_flags=re_flags)
              if not self.check_enable_mode():
                  raise ValueError("Failed to enter enable mode.")
          return output
  