oracle dataguard ：standby库在mount状态时，主库怎么传送日志？

Errors in file c:\oracle10.2.0\admin\dbprim\bdump\dbprim_arc0_1064.trc:
ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务PING[ARC0]: Heartbeat failed to connect to standby 'dbstand'. Error is 12514.报错如上
standby库处在mounted状态；如下
SQL> select status from v$instance;STATUS
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MOUNTED主库怎么能连接到standby库;如下报错
SQL> conn sys/oracle@dbstand as sysdba;
ERROR:
ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务