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This chapter describes the function and displays the syntax for the commands to configure synchronous serial interfaces for dial-up solutions. For more information about defaults and usage guidelines, see the corresponding chapter of the Dial Solutions Command Reference.
To communicate the bandwidth value of an interface to the higher-level protocols, use the bandwidth interface configuration command. Use the no form of this command to restore the default values.
bandwidth kilobits| kilobits | Intended bandwidth in kilobits per second. |
Use the clock rate interface configuration command to configure the clock rate for the hardware connections on serial interfaces such as network interface modules (NIMs) and interface processors to an acceptable bit rate. Use the no form of this command to remove the clock rate if you change the interface from a DCE to a DTE device. Using the no form of this command on a DCE interface sets the clock rate to the hardware-dependent default value.
clock rate bps| bps | Desired clock rate in bits per second: 1200, 2400, 4800, 9600, 19200, 38400, 56000, 64000, 72000, 125000, 148000, 250000, 500000, 800000, 1000000, 1300000, 2000000, 4000000, or 8000000.
For the synchronous serial port adapters (PA-8T-V35, PA-8T-X21, PA-8T-232, and PA-4T+), a nonstandard clock rate can be used. You can enter any value from 300 to 8000000 bps. The clock rate you enter is rounded (adjusted), if necessary, to the nearest value your hardware can support except for the following standard rates: 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 56000, 64000, 128000, or 2015232. |
To control which clock a G.703 E1 interface will use to clock its transmitted data, use the clock source interface configuration command. Use the no form of this command to restore the default value.
clock source {line | internal}| line | Specifies that the interface will clock its transmitted data from a clock recovered from the line's receive data stream (default). |
| internal | Specifies that the interface will clock its transmitted data from its internal clock. |
To configure software compression for Link Access Procedure, Balanced (LAPB), and High-Level Data Link Control (HDLC) encapsulations, use the compress interface configuration command. To disable compression, use the no form of this command.
compress [predictor | stac]| predictor | (Optional) Specifies that a predictor compression algorithm will be used. |
| stac | (Optional) Specifies that a Stacker (LZS) compression algorithm will be used. |
To enable generation of CRC4 on the G.703 E1 port adapter on the FSIP, use the crc4 interface configuration command. To disable this feature, use the no form of this command.
crc4To enable generation of CRC5 (per ITU Recommendation G.704 and G.703) to improve data integrity, use the crc bits 5 interface configuration command. To disable this feature, use the no form of this command.
crc bits 5When running the line at high speeds and long distances, use the dce-terminal-timing enable interface configuration command to prevent phase shifting of the data with respect to the clock. If SCTE is not available from the DTE, use no form of this command, which causes the DCE to use its own clock instead of SCTE from the DTE.
dce-terminal-timing enableTo add a description to an interface configuration, use the description interface configuration command. Use the no form of this command to remove the description.
description string| string | Comment or a description to help you remember what is attached to this interface. |
On the Cisco 4000 series, you can specify the serial Network Processor Module timing signal configuration. When the board is operating as a DTE, the dte-invert-txc command inverts the TXC clock signal it gets from the DCE that the DTE uses to transmit data. Use the no form of this command if the DCE accepts SCTE from the DTE.
dte-invert-txcTo set the encapsulation method used by a serial interface, use the encapsulation interface configuration command.
encapsulation encapsulation-type| encapsulation-type | Encapsulation type; one of the following keywords:
hdlc--High-Level Data Link Control (HDLC) protocol for serial interface. This encapsulation method provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. This is the default. ppp--Point-to-Point Protocol (PPP) (for serial interface). |
Use the ignore-dcd interface configuration command to configure the serial interface to monitor the DSR signal (instead of the DCD signal) as the line up/down indicator. Use the no form of this command to restore the default behavior.
ignore-dcdUse the invert txclock interface configuration command to invert the transmit clock signal. To return to the transmit clock signal to its initial state, use the no form of this command.
invert txclockUse the nrzi-encoding interface configuration command to enable nonreturn-to-zero inverted (NRZI) line-coding format. Use the no form of this command to disable this capability.
nrzi-encoding| mark | (Optional) Specifies that NRZI mark encoding is required on the PA-8T and PA-4T+ synchronous serial port adapters on the Cisco 7000 series routers with RSP7000, Cisco 7200 and 7500 series routers. If mark is not specified, NRZI space encoding is used. |
To enable pulsing DTR signal intervals on the serial interfaces, use the pulse-time interface configuration command. Use the no form of this command to restore the default interval.
pulse-time seconds| seconds | Integer that specifies the DTR signal interval in seconds. |
To enable framed mode serial interface on a G.703 E1 port adapter on an FSIP, use the timeslot interface configuration command. To restore the default, use the no form of this command or set the start slot to 0.
timeslot start-slot - stop-slot| start-slot | The first subframe in the major frame. Range is 1 to 31 and must be less than or equal to stop-slot. |
| stop-slot | The last subframe in the major frame. Range is 1 to 31 and must be greater than or equal to start-slot. |
When a DTE does not return a transmit clock, use the transmit-clock-internal interface command to enable the internally generated clock on a serial interface on a Cisco 7000 series, Cisco 7200 series, or Cisco 7500 series. Use the no form of this command to disable the feature.
transmit-clock-internalTo specify a minimum dead-time after transmitting a packet, use the transmitter-delay interface configuration command. The no form of this command restores the default.
transmitter-delay delay| delay | On the FSIP, HSSI, and on the IGS router, the minimum number of HDLC flags to be sent between successive packets. On all other serial interfaces and routers, approximate number of microseconds of minimum delay after transmitting a packet. The valid range is 0 to 131071. |
To control the use of time slot 16 for data on a G.703 E1 interface, use the ts16 interface configuration command. To restore the default, use the no form of this command.
ts16
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