產(chǎn)品細節(jié)介紹
ZEBRA 112ER01-00000 110PAS4驅動控制器
容納網(wǎng)絡連接開銷
SRTP通道內的應用程序超時還包括建立和維護基礎網(wǎng)絡所需的時間，以及SRTP連接。例如建立TCP連接對于新頻道，建立與遠程設備和通道操作期間的TCP重新傳輸。如果建立或維護TCP連接所需的時間超過用戶指定的通道應用程序超時值將發(fā)生應用程序超時。通道應用程序超時是臨時錯誤；頻道繼續(xù)運行。
客戶端通道TCP資源管理操作系統(tǒng)網(wǎng)絡堆棧掛起關聯(lián)的TCP資源在連接關閉后的一段時間內保持連接。
這段時間適用于收盤的發(fā)起人始終是客戶端。這一時間被稱為“TCP延遲期間”。一旦TCP延遲期到期（60秒當前操作系統(tǒng)實現(xiàn)），則釋放TCP資源。
使用客戶端通道的應用程序開發(fā)人員需要了解設計邏輯時的這種行為。
有限數(shù)量的TCP資源分配給客戶端通道，如果通道連接的啟動和關閉速度如此之快，以至于這些資源則應用程序可能必須等待TCP釋放資源以建立另一個客戶端通道（a如果沒有TCP資源，則返回0xA890的COMMREQ狀態(tài)當前可用；應用程序應等待并重試）。
SRTP客戶端通道提供了幫助用戶保留的功能TCP連接。
其中包括一段時間建立SRTP通道并指定要在給定間隔，或盡可能快地跑。還可以指定迭代次數(shù)，或允許通道永遠運行。此外，SRTP信道允許對活動信道重新分配任務同一遠程設備，其中活動通道的參數(shù)，例如更改通道命令類型（讀/寫）、編號重復次數(shù)、時間段、本地內存地址、遠程內存地址等可以更改。
SRTP信道也允許信道將活動通道重新分配給其他遠程設備（更改遠程設備的IP地址等）。然而，重新分配任務到另一個遠程設備既不會保留TCP連接，也不會節(jié)省創(chuàng)建頻道所需的時間。
在冗余系統(tǒng)中，客戶端通道COMMREQ只能從擁有冗余IP地址的單元啟動。
因此，用戶應用程序邏輯應使用LAN中的位6接口狀態(tài)位區(qū)域，“冗余IP活動”作為其一部分驅動客戶端通道COMMREQ的啟用邏輯。
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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