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Command or Action |
Purpose |
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clock rate rate
Example:
Router(config-cem)# clock rate 38400
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(Optional) For serial channels only. Specifies the nominal bit rate of a serial CEM channel.
- Use the rate argument to specify the data rate of the channel in bps. Default is 64000.
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clock mode {normal | split}
Example:
Router(config-cem)# clock mode split
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(Optional) For serial channels only. Specifies the clock mode of a serial CEM channel.
- Use the normal keyword to specify that the Data Circuit-terminating Equipment (DCE) provides both the Receive Clock (RxC) and the Transmit clock (TxC) to the attached Data Terminal Equipment (DTE).
- Use the split keyword to specify that the DCE provides the Receive Clock (RxC) to the attached DTE, and the DTE provides the external Transmit Clock (XTC or TT) to the DCE.
Note |
Depending on the serial cable attached to the port, the port is automatically configured as either a DCE or DTE. |
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clock source {internal | loop| adaptive}
Example:
Router(config-cem)# clock source loop
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(Optional) Configures the clock source for a serial CEM channel.
- This step applies only to configuring serial channels. For information about configuring the clock source for T1 or E1 ports, see the Configuring the T1 E1 Line.
- Use the internal keyword to specify that the clock(s) provided by the network module to the CPE is derived from the TDM bus backplane clock, if one exists in the router, or the on-board oscillator on the network module.
- Use the loop keyword to specify that the clock provided by the network module to the CPE is derived from the the clock receive from the CPE on the same port.
- Use the adaptive keyword to specify that the clock(s) provided by the network module to the CPE is locally synthesized based on the average data content of the local dejitter buffer.
Note |
The loop keyword is valid only when the clock mode split command is configured. |
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payload-size size
Example:
Router(config-cem)# payload-size 512
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(Optional) Specifies the number of bytes encapsulated into a single IP packet.
- Use the size argument to specify the number of bytes included in the payload of each packet. Default is 32 bytes for a serial CEM channel.
- For more information about T1 and E1 default values, see the payload-size command in the "Command Reference" section.
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dejitter-buffer size
Example:
Router(config-cem)# dejitter-buffer 80
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(Optional) Specifies the size of the dejitter buffer used to compensate for the network filter.
- Use the size argument to specify the size of the buffer in milliseconds. Default is 60.
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control-lead sampling-rate rate
Example:
Router(config-cem)# control-lead sampling-rate 10
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(Optional) Specifies the sampling rate of input control leads on a serial CEM channel.
- This command is used only on serial channels.
- Use the rate argument to specify the frequency with which the control leads are sampled, in samples per second. Default is 0.
Note |
Control lead update packets are independent of the data packets from the same channel. |
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control-lead state {active | fail} output-lead{on| off| follow} [{local | remote} input-lead]
Example:
Router(config-cem)# control-lead state active rts follow remote cts
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(Optional) Specifies the state of each output control lead on a serial CEM channel.
- This command is used only on serial channels.
- Use the active keyword to specify the state of the control lead when the connection is active.
- Use the fail keyword to specify the state of the control lead when the connection has failed.
- Use the output-leadargument to specify the name of the control lead.
- Use the on keyword to specify that the control lead is permanently asserted.
- Use the off keyword to specify that the control lead is permanently not asserted.
- Use the follow keyword to specify that the control lead is to follow any changes in the state of an input control lead specified by the local or remote keywords and the input-lead argument.
- Use the input-lead argument to specify the name of the local or remote control lead to follow.
Note |
Control lead update packets are independent of the data packets for the same channel. |
Note |
The control-lead sampling-rate parameter must be set to non-zero for this feature to operate. |
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data-strobe input-lead {on| off}
Example:
Router(config-cem)# data-strobe dtr on
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(Optional) Specifies that an input control lead is to be monitored and data is packetized and sent only when the specified control lead is in the specified state.
- This command is used only on serial channels.
- Use the input-lead argument to specify the input control lead to be monitored to determine whether input data is to be packetized.
- Use the on keyword to specify that data packets are to be sent from this CEM channel only when the specified input lead is asserted.
- Use the off keyword to specify that data packets are to be sent from this CEM channel only when the specified input lead is not asserted.
- Use this command to save bandwidth when the attached CPE is inactive.
Note |
Control lead update packets are still sent even if data packets are withheld. |
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Cisco NM-CEM-4SER:
Example:
idle-pattern length pattern1 [pattern2]
Example:
Cisco NM-CEM-4TE1:
Example:
idle-pattern pattern1
Example:
Cisco NM-CEM-4SER:
Example:
Router(config-cem)# idle-pattern 53 0x12345678 0x87654321
Example:
Cisco NM-CEM-4TE1:
Example:
Router(config-cem)# idle-pattern 0x66
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(Optional) Defines the idle data pattern to send to the attached CPE when packets are lost or the de-jitter buffer experiences an under-run condition. For serial CEM channels:
- A bit pattern up to 64 bits long may be specified.
- Use the pattern1 argument to specify up to 32 bits of the least significant bits of the idle data pattern, in hex notation. Default is 0xFF.
- Use the pattern2 argument to specify the most significant bits of the idle data pattern, in hex notation. If the length argument is 32 bits or less, this argument is not permitted.
- Use the length argument to specify the total length of the repeating bit pattern. Default is 8 bits.
For T1 or E1 CEM channels:
- An eight-bit pattern is specified.
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signaling
Example:
Router(config-cem)# signaling
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(Optional) Enables the transport of Channel Associated Signaling (CAS) bits.
Note |
This command applies only to framed T1 or E1 data channels. |
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payload-compression
Example:
Router(config-cem)# payload-compression
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(Optional) Enables payload compression on a CEM channel.
Note |
Enabling payload compression adds a delay equal to one packet time. |
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data-protection
Example:
Router(config-cem)# data-protection
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(Optional) Enables data protection by transmitting each data bit twice, once in each of two consecutive data packets.
- Use the data-protection command to protect transmissions from the effects of lost IP packets.
Caution |
Use this command carefully because it increases the network bandwidth used by the CEM connection. |
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ip dscp dscp
Example:
Router(config-cem)# ip dscp 36
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(Optional) Configures the IP Differentiated Service Code Point (DSCP) for packets originating from this CEM channel.
- Use the dscp argument to specify the value placed in the DSCP field of IP packets originating from this channel. Default is 46.
Note |
If DSCP is configured, the ip tos and ip precedence commands are not available because they are mutually exclusive. |
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ip tos tos
Example:
Router(config-cem)# ip tos 11
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(Optional) Configures the IP type of service (ToS) bits for the CEM channel.
- Use the tos argument to specify the value placed in the ToS field of IP packets originating from this channel. Default is 5.
Note |
If DSCP is configured, the ip tos command is not available because they are mutually exclusive. |
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ip precedence precedence
Example:
Router(config-cem)# ip precedence 7
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(Optional) Configures the IP precedence bits for the CEM channel.
- Use the precedence argument to specify the value placed in the precedence field of IP packets originating from this channel. Default is 0.
Note |
If DSCP is configured, the ip precedence command is not available because they are mutually exclusive. |
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loopback {local | network}
Example:
Router(config-cem)# loopback network
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(Optional) Creates a loopback from a CEM serial channel.
- Use the local keyword to create a loopback where the information from a locally-attached CPE is transmitted back to the locally-attached CPE.
- Use the network keyword to create a loopback where the data received over the network from a remotely-attached CPE is transmitted back to the remotely-attached CPE.
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exit
Example:
Router(config-cem)# exit
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Exits CEM configuration mode and returns to global configuration mode.
- Use this command one more time to exit to privileged EXEC mode.
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