Cisco 4G-LTE-ANTM-O-3 Installation Guide Page 180

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You cannot use the physical-layer async command for frame-relay encapsulation.Note
Encapsulation methods are set according to the type of protocol or application you configure in the Cisco IOS
software.
PPP is described in Configuring Media-Independent PPP and Multilink PPP.
The remaining encapsulation methods are defined in their respective books and chapters describing the
protocols or applications. Serial encapsulation methods are also discussed in the Cisco IOS Interface
and Hardware Component Command Referenceencapsulation command.
By default, synchronous interfaces operate in full-duplex mode. To configure an SDLC interface for half-duplex
mode, use the following command in interface configuration mode.
PurposeCommand
Configures an SDLC interface for half-duplex mode.
Router(config-if)# half-duplex
Binary synchronous communication (Bisync) is a half-duplex protocol. Each block of transmission is
acknowledged explicitly. To avoid the problem associated with simultaneous transmission, there is an implicit
role of primary and secondary stations. The primary sends the last block again if there is no response from
the secondary within the period of block receive timeout.
To configure the serial interface for full-duplex mode, use the following command in interface configuration
mode.
PurposeCommand
Specifies that the interface can run Bisync using
switched RTS signals.
Router(config-if)# full-duplex
Configuring PPP
To configure PPP, refer to the Configuring Media-Independent PPP and Multilink PPP.
Configuring Bisync
To configure the Bisync feature on the synchronous serial port adapters on Cisco 819 ISRs, refer to the Block
Serial Tunneling (BSTUN) Overview. All commands listed in this section apply to the synchronous serial
port adapters on Cisco 891 ISRs. Any command syntax that specifies an interfacenumber supports the Cisco
891 ISRs slot/port syntax.
Configuring Compression of HDLC Data
You can configure point-to-point software compression on serial interfaces that use HDLC encapsulation.
Compression reduces the size of a HDLC frame via lossless data compression. The compression algorithm
used is a Stacker (LZS) algorithm.
Cisco 800 Series Integrated Services Routers Software Configuration Guide
152 OL-31704-02
Configuring the Serial Interface
Configuring a Synchronous Serial Interface
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