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ZEBRA 112ER01-00000 110PAS4驱动控制器
容纳网络连接开销
SRTP通道内的应用程序超时还包括建立和维护基础网络所需的时间，以及SRTP连接。例如建立TCP连接对于新频道，建立与远程设备和通道操作期间的TCP重新传输。如果建立或维护TCP连接所需的时间超过用户指定的通道应用程序超时值将发生应用程序超时。通道应用程序超时是临时错误；频道继续运行。
客户端通道TCP资源管理操作系统网络堆栈挂起关联的TCP资源在连接关闭后的一段时间内保持连接。
这段时间适用于收盘的发起人始终是客户端。这一时间被称为“TCP延迟期间”。一旦TCP延迟期到期（60秒当前操作系统实现），则释放TCP资源。
使用客户端通道的应用程序开发人员需要了解设计逻辑时的这种行为。
有限数量的TCP资源分配给客户端通道，如果通道连接的启动和关闭速度如此之快，以至于这些资源则应用程序可能必须等待TCP释放资源以建立另一个客户端通道（a如果没有TCP资源，则返回0xA890的COMMREQ状态当前可用；应用程序应等待并重试）。
SRTP客户端通道提供了帮助用户保留的功能TCP连接。
其中包括一段时间建立SRTP通道并指定要在给定间隔，或尽可能快地跑。还可以指定迭代次数，或允许通道永远运行。此外，SRTP信道允许对活动信道重新分配任务同一远程设备，其中活动通道的参数，例如更改通道命令类型（读/写）、编号重复次数、时间段、本地内存地址、远程内存地址等可以更改。
SRTP信道也允许信道将活动通道重新分配给其他远程设备（更改远程设备的IP地址等）。然而，重新分配任务到另一个远程设备既不会保留TCP连接，也不会节省创建频道所需的时间。
在冗余系统中，客户端通道COMMREQ只能从拥有冗余IP地址的单元启动。
因此，用户应用程序逻辑应使用LAN中的位6接口状态位区域，“冗余IP活动”作为其一部分驱动客户端通道COMMREQ的启用逻辑。
accommodate network connection overhead
The application timeouts within SRTP Channels also include the time needed to establish and maintain the underlying network and SRTP connection. Examples are establishing the TCP connection for a new channel, establishing communication with the remote device, and TCP retransmissions during Channel operations. If the time needed for TCP connection establishment or maintenance exceeds the user-specified channel application timeout values, an application timeout will occur. Channel application timeouts are temporary errors; the channel continues to run.
In a Redundancy System, Client Channel COMMREQs can only be initiated from the unit that owns the Redundant IP address. Therefore, the user application logic should use Bit 6 in the LAN Interface Status bit area, “Redundant IP Active” as part of their enabling logic that drives a client channel COMMREQ.
Client Channels TCP resource management
The OS Network stack hangs on to the TCP resources associated with a connection for a period of time after the connection is closed. This time period applies to the initiator of the close, which is almost always the client side. This time is referred to as the “TCP Linger Period”. Once the TCP Linger Period expires (60 seconds in the current OS implementation), the TCP resources are released. Application developers using client channels need to be aware of this behavior when designing their logic. A finite number of TCP resources are allocated to client channels, and if channel connections are brought up and down so fast that these resources are depleted, then the application may have to wait until a TCP resource frees up in order to establish another client channel (a COMMREQ Status of 0xA890 is returned if no TCP resources are currently available; application should wait and try again). SRTP Client Channels provides features that help the user preserve TCP connections. These include a period time where one can establish an SRTP Channel and specify the channel to run at a given interval, or run as fast a possible. One can also specify a number of iterations, or allow the channel to run forever. Additionally, SRTP Channels allows channel re-tasking of an active channel to the same remote device, where the parameters of an active channel, such as changing the channel command type (Read/Write), number of repetitions, time periods, local memory address, remote memory address, etc. can be changed. SRTP Channels also allows channel re-tasking of an active channel to a different remote device (changing the remote device’s IP address, etc.). However, re-tasking to a different remote device will neither conserve TCP connections, nor save on the time it takes to create a channel.
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