| 1. | The sgsns establish external connections via provincial backbone nodes
Sgsn通过省内骨干节点实现同外部的连接。 |
| 2. | When there is a backbone ip network in the province , the gsn , a generic term for both the sgsn and the ggsn , can serve as an access node to the backbone ip network
当省内有ip骨干网络时， gsn （ gprs服务节点与关口节点的统称）节点作为ip骨干网的接入节点。 |
| 3. | Sgsn 900 1800mhz tdma digital cellular mobile communication network test method of gprs general packet radio service base station system and serving gprs support node interface
900 1800mhz tdma数字蜂窝移动通信网通用分组无线业务gprs基站子系统与服务gprs支持节点 |
| 4. | In addition , in local networks where there are sgsns but no ggsns , ggsns of other local networks or the provincial network need to be used , leading to the increase of routers
另外在只设sgsn而没有ggsn的本地网中需要借助其它本地网或省网的ggsn ，增加了路由器的负荷。 |
| 5. | The use of the fr network can converge data from each pcu to one of the ports of the sgsn , leading to great reduction of ports . now , the pcu and the sgsn both serve as the user end of the fr network
采用fr网络，可以将各pcu的数据汇聚到sgsn的一个端口上，大大节省了端口数，此时pcu和sgsn同时作为fr网络的用户端。 |
| 6. | The rnc , the wireless part of the 3g network is connected to the msc via interface iucs and to the sgsn via interface iups . so the gprs network can support the transition of the network easily
3g网络的无线部分rnc通过iucs接口与msc连接，通过iups接口与sgsn连接，由此可见建设gprs网络后，能够很容易地支持网络的过渡。 |
| 7. | Confuguration 1 applies to backward areas , where pcus are added to the bss part and connected to sgsns of other local networks on a pppfr basis , with each sgsn responsible for more than one local network
方式1应用于一些落后地区的市区。这些地区的bss部分增加pcu单元，通过pppfr等方式连接到其它本地网的sgsn ，一个sgsn负责多个本地网。 |
| 8. | The sgsns and the ggsns in different local networks communicate either via an fratm network on a pvc basis or via routers at provincial backbone nodes ; so the network has a certain degree of flexibility
不同的本地网sgsn与ggsn之间的通信，既可以通过fratm网络以pvc的方式建立连接，也可以通过省内骨干节点的路由器进行转接，网络具有一定的灵活性。 |
| 9. | The ppp mode does not need fr networks , with the pcu serving as the user end and the sgsn as the network end . each pcu needs a corresponding port on the sgsn side , leading to great consumption of the resources of ports and their low utilization
采用ppp方式，不需要有fr网络， pcu作为用户端而sgsn作为网络端，此时每个pcu端在sgsn侧需要一个对应的端口，端口资源消耗大且利用率低。 |
| 10. | Using fr and atm can solve the problem of additional ports and their low utilization . the sgsn may have more than one pvc as required . though dependent on other networks , this networking plan is flexible . its network structure is shown in figure 5
采用fr或atm ，就可以解决端口数目和效率等问题， sgsn根据需要可以有多个pvc ，这种组网方式依赖其它的网络但组网方式较为灵活，网络的结构如图5所示。 |
