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Configuring RTC terminal access
About RTC terminal access
Terminal access enables a terminal to use a serial interface to access another terminal through
routers. Remote terminal connection (RTC) terminal access is a typical application of terminal
access. RTC terminal access interconnects a local terminal and a remote terminal through routers
for data monitoring and data sharing.
Network devices in RTC terminal access
The following types of network devices are used in RTC terminal access:
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Terminal
—A terminal refers to a character device that is generally connected to a router
through a serial interface cable.
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Initiator
—An initiator refers to a router that sends a connection request and acts as the RTC
client of the connection.
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Receiver
—A receiver refers to a router that responds to a connection request and acts as the
RTC server of the connection.
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Relay server
—A relay server provides functions similar to a receiver, except that the relay
server is not directly connected to terminals. Instead, the relay server is connected to multiple
initiators and manages them in different forwarding groups according to the listening port
numbers. Data received from an initiator is forwarded to other initiators in the same group.
NOTE:
In an actual network, the receiver and the relay server are not both deployed.
Connections between an initiator and a receiver can use either TCP or UDP. After a connection is
established between an initiator and a receiver, the initiator and receiver can transparently transmit
data from the local terminal to the remote terminal over the connection. The transmission is
transparent in that no manual or extra operation is required.
Typical applications of RTC terminal access
RTC terminal access has the following purposes:
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Enabling a monitoring device to manage and monitor remote terminals.
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Sharing data among multiple terminals such as radar devices.
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Collecting data from remote terminals.
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Synchronizing signal data on a broadcast communication network.
RTC terminal access supports synchronous mode and asynchronous mode.
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Asynchronous mode
—In asynchronous mode, an initiator and a receiver support only TCP
connections between them, including the following types:
TCP one-to-one transparent transmission between one RTC client and one RTC server.
TCP many-to-one transparent transmission between multiple RTC clients and one relay
server.
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Synchronous mode
—In synchronous mode, an initiator and a receiver support TCP or UDP
connections, including the following types:
