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IdTCPClient1.Host := ...;
IdTCPClient1.Port := 23;
IdTCPClient1.Connect;
if not (IdTCPClient1.Connected) then
begin
    showmessage('es konnte keine Verbindung aufgebaut werden!');
    exit;
end;

IdTCPClient1.SendCmd('USER ' + 'username');
IdTCPClient1.SendCmd('PASS ' + 'password');
JvMemo1.Lines.Add(IdTCPClient1.IOHandler.ReadLn);

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IdTelnet1.Host := '....';
IdTelnet1.Port := 23;
IdTelnet1.Connect;
IdTelnet1.SendCmd('username');
IdTelnet1.SendCmd('passwort');
...

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type
  TConnectionTask = (
    ctDisconnect, // Verbindung trennen
    ctQuery       // Verbindungszustand abfragen
    );

  TMainForm = class(TForm)
    LC: TIdTelnet;
    edHost: TEdit;
    edPassword: TEdit;
    BtnQuery: TButton;
    BtnDisconnect: TButton;
    procedure LCDataAvailable(Sender: TIdTelnet; const Buffer: String);
    procedure LCConnected(Sender: TObject);
    procedure BtnQueryClick(Sender: TObject);
    procedure BtnDisconnectClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    FConnectionTask: TConnectionTask;
    FReceiveBuffer: String;
    procedure SetConnectionTask(const Value: TConnectionTask);
  public
    property ConnectionTask: TConnectionTask read FConnectionTask write SetConnectionTask;
  end;

var
  MainForm: TMainForm;

implementation

{$R *.dfm}

procedure TMainForm.LCConnected(Sender: TObject);
begin
  LC.WriteLn(edPassword.Text);
  case FConnectionTask of
    ctQuery:
      begin
        LC.WriteLn('dir /st/conn');
        LC.WriteLn('dir /st/wa/th');
      end;
    ctDisconnect:
      LC.WriteLn('do /o/m/d');
  end;
  LC.WriteLn('exit');
end;

procedure TMainForm.LCDataAvailable(Sender: TIdTelnet; const Buffer: String);
begin
  FReceiveBuffer := FReceiveBuffer +Buffer;
  if (NOT Sender.Connected) then
    if (FConnectionTask > ctDisconnect) then
      with TStringList.Create do try
        CommaText := UpperCase(FReceiveBuffer);
        while ( (Count > 0) and (Strings[0] <> 'DSL-CH-1') ) do
          Delete(0);
        if (Count >= 6) then begin
          edConTime.Text := Strings[5];
          Delete(0);
        end;
        while ( (Count > 0) and (Strings[0] <> 'DSL-CH-1') ) do
          Delete(0);
        if (Count >= 4) then
          edAvgRx.Text := Strings[3];
      finally
        Free;
      end;
end;

procedure TMainForm.SetConnectionTask(const Value: TConnectionTask);
begin
  FConnectionTask := Value;
  FReceiveBuffer := '';
  LC.Connect;
end;

procedure TMainForm.BtnQueryClick(Sender: TObject);
begin
  ConnectionTask := ctQuery;
end;

procedure TMainForm.BtnDisconnectClick(Sender: TObject);
begin
  ConnectionTask := ctDisconnect;
end;