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Cisco MC3810 Command Reference Guide
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Global Configuration Commands
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EXEC Commands
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T1/E1 Controller Commands
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Frame Relay Commands
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FR - ATM Interworking Command
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ATM Commands
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HDLC Command
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UIO Serial Port Commands
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Voice Port Configuration Commands
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Dial-Peer Configuration Commands
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PBX Signaling Format Commands
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Cisco MC3810-IGX Interworking Commands
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CDR Command
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Router Memory Commands
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Table Of Contents
UIO Serial Port Commands
This chapter describes the commands to configure the Universal I/O (UIO) serial ports 0 and 1 on Cisco MC3810 series concentrators. The following are the UIO serial port commands:
clock rate
To configure serial port 0 or 1 in DCE mode to use clock from the baud rate generator, use the clock rate interface configuration command. Use the no form of this command to cancel use of the baud rate generator.
clock rate rate
no clock rate rateSyntax Description
Defaults
No clock rate is configured.
Command Mode
Interface configuration
Command History
10.0
This command was first introduced.
11.3 MA
This command was modified in to include clock rates for the Cisco MC3810.
Usage Guidelines
Be aware that the fastest speeds might not work if your cable is too long, and that speeds faster than 148,000 bits per second are too fast for EIA/TIA-232 signaling. It is recommended that you only use the synchronous serial EIA/TIA-232 signal at speeds up to 64,000 bits per second. To permit a faster speed, use EIA/TIA-449 or V.35.
Examples
The following example sets the clock on serial port 0 for a clock rate of 64000 bps:
interface serial 0clock rate 64000clock rate line
To configure serial port 0 in DTE mode for the incoming line clock rate, use the clock rate line interface configuration command. Use the no form of this command to cancel the clock rate line value.
clock rate line rate
no clock rate line rateSyntax Description
rate
Network clock rate of the incoming line, in bits per second (bps). The value entered must be a multiple of 8000, with a range of 8000 to 2048000. There is no default rate.
Defaults
No clock rate is configured.
Command Mode
Interface configuration
Command History
Usage Guidelines
The value specified with this command must be the clock rate of the incoming line, in bits per second (bps). This allows the appropriate internal clock scaling to be performed, so that the internal clock generator can synchronize to the incoming clock.
Examples
The following example configures serial port 0 to recover a clock with a rate of 64000 bps:
interface serial 0clock rate line 64000Related Commands
network clock select 1 serial 0
Configures the internal clock generator to synchronize to the clock signal recovered from serial port 0.
clock rate network
To configure the network clock rate for serial port 0 or 1 in DCE mode, use the clock rate network interface configuration command. The no form of this command cancels the network clock rate value.
clock rate network rate
no clock rate network rateSyntax Description
Defaults
No network clock rate is configured.
Command Mode
Interface configuration
Command History
Usage Guidelines
This command synchronizes a serial port to the Cisco MC3810 internal clock generator. The use of this command allows the clock on a DCE serial port to be synchronized with any incoming clock.
Examples
The following example sets the clock rate on serial port 0 in DCE mode to 64000 bps:
interface serial 0clock rate network 64000Related Commands
network-clock base-rate
Configures the base rate for serial ports 0 and 1 in DCE mode to operate at a rate compatible with T1 or E1.
encapsulation clear-channel
To configure serial interface 0 or 1 to be in clear-channel mode for pass-through traffic, use the encapsulation clear-channel interface command. Use the no form of this command to disable clear-channel encapsulation.
encapsulation clear-channel
no encapsulation clear-channelSyntax Description
This command has no arguments or keywords.
Defaults
Clear-channel encapsulation is not configured.
Command Mode
Interface configuration
Command History
Usage Guidelines
When a serial interface is configured for clear-channel encapsulation, it is capable of being cross-connected to the trunk.
Examples
The following example configures serial port 0 for clear-channel encapsulation:
interface serial 0encapsulation clear-channelRelated Commands
cross-connect
Configures a connection between a voice dial peer and the FTC trunk.
invert rxclock
To invert the phase of local clock used for timing incoming data on a UIO serial port in DCE mode, use the invert rxclock interface configuration command. To cancel the phase inversion, use the no form of this command.
invert rxclock
no invert rxclockSyntax Description
This command has no arguments or keywords.
Defaults
Clock phase is not inverted.
Command Mode
Interface configuration
Command History
Usage Guidelines
Use this command when received data is phase-shifted due to delay caused by cable length, and the far-end DTE interface does not loop back the transmit clock.
If the far-end DTE interface loops back the transmit clock, use the dce-terminal-timing enable command to synchronize the received data at the DCE interface with the looped-back clock.
Examples
The following example inverts the phase of the clock that times received data on serial port 0:
interface serial 0invert rxclockRelated Commands
dce-terminal-timing enable
Prevents phase shifting of received data with respect to clock
Inverts the phase of the incoming transmit clock on a serial port in DTE mode.
invert txclock
To invert the phase of incoming transmit clock on a UIO serial port in DTE mode, use the invert txclock interface configuration command. To cancel the phase inversion, use the no form of this command.
invert txclock
no invert txclockSyntax Description
This command has no arguments or keywords.
Defaults
Clock phase is not inverted.
Command Mode
Interface configuration
Command History
10.0
This command was first introduced as invert-transmit-clock.
11.3
The command syntax was changed to invert txclock.
Usage Guidelines
Use this command for a serial port operating in DTE mode if the DTE interface does not loop the transmit clock back, and the data received at the far end is phase-shifted due to delay caused by cable length.
If the a DTE interface loops back the transmit clock, use the dce-terminal-timing enable command at the far-end DCE interface to synchronize the received data at the DCE interface with the looped-back clock, and do not use the invert txclock command.
Examples
The following example inverts the phase of the transmit clock on serial port 0:
interface serial 0invert txclockRelated Commands
