text: """MRV Communications Driver (OptiSwitch)."""
  import time
  import re
  from typing import Optional
  
  from netmiko.cisco_base_connection import CiscoSSHConnection
  
  
  class MrvOptiswitchSSH(CiscoSSHConnection):
      """MRV Communications Driver (OptiSwitch)."""
  
      def session_preparation(self) -> None:
          """Prepare the session after the connection has been established."""
          self._test_channel_read(pattern=r"[>#]")
          self.set_base_prompt()
          self.enable()
          self.disable_paging(command="no cli-paging")
          # Clear the read buffer
          time.sleep(0.3 * self.global_delay_factor)
          self.set_base_prompt()
          self.clear_buffer()
  
      def enable(
          self,
          cmd: str = "enable",
          pattern: str = r"#",
          enable_pattern: Optional[str] = None,
          re_flags: int = re.IGNORECASE,
      ) -> str:
          """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, read_entire_line=True
              )
              if not self.check_enable_mode():
                  msg = (
                      "Failed to enter enable mode. Please ensure you pass "
                      "the 'secret' argument to ConnectHandler."
                  )
                  raise ValueError(msg)
          return output
  
      def save_config(
          self,
          cmd: str = "save config flash",
          confirm: bool = False,
          confirm_response: str = "",
      ) -> str:
          """Saves configuration."""
          return super().save_config(
              cmd=cmd, confirm=confirm, confirm_response=confirm_response
          )
  