| 1. | All the switches that use 155 mbits trunk ports are switching systems newly installed
采用155mbits中继端口的交换机都是新建交换系统。 |
| 2. | This issue does not exist in the switches that do not use 155 mbits trunk ports
北京电信现有交换机中，没有采用155mbits中继端口的交换机不存在此类问题。 |
| 3. | The time slot configuration rules of 155 mbits trunk port signals can remain unchanged since they comply with the requirements in ydn099 - 1998 table 10
其中贝尔公司155mbits中继端口信号时隙配置规则与ydn099 - 1998表10要求一致，不必改动。 |
| 4. | One reason for this increase is that the traffic on the 155 mbits dedicated lines increased ; the other reason is the use of 155 mbits trunk ports in the data networks ( ddn , fr , etc . ) and switches
其中一个原因是155mbits专线业务有所增加，另一个原因就是数据网（ ddn 、 fr等）和交换机采用了155mbits中继端口。 |
| 5. | The issue of unifying numbering time slots of 155 mbits signals in the beijing telecom network came up after the use of 155 mbits trunk ports in the switches , which resulted in the change of the usage of the transmission network
1问题产生的背景北京电信网155mbits信号时隙编号统一问题，是在交换机采用155mbits中继端口的情况下出现的。 |
| 6. | From these figures we can see that the use of 155 mbits trunk ports in the switches simplifies the interface between the switching and transmission networks , reduces lots of multiplex equipment of 2 mbits tributary channels in the transmission network
图2交换机间155mbits端口互通类型二从图中可看出，交换中继端口采用155mbits后，交换和传输的接口简单了很多。 |
