Cisco ASR 1000

18-8
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 18 Configuring the 4-Port Serial Interface SPA
Configuration Tasks
Use the following commands when configuring timing signals:
Note Clock rates supported for EIA/TIA-232: 1.2K, 2.4K, 4.8K, 9.6K, 14.4K, 19.2K, 28.8K, 32K, 38.4K,
56K, 64K, 128K.
Note Clock rates supported for EIA-530, EIA-530A, EIA-449, V.35(bps): 1.2K, 2.4K, 4.8K, 9.6K, 14.4K,
19.2K, 28.8K, 32K, 38.4K, 56K, 64K, 72K, 115.2K, 2.048M, 2.341M, 2.731M, 3.277M, 4.09M,
5.461M, 8.064K.
Note Clock rates supported for X.21: 1.2K, 2.4K, 4.8K, 9.6K, 14.4K, 19.2K, 28.8K, 32K, 38.4K, 56K, 64K,
72K, 115.2K, 2.016M.
Command Purpose
Router# configure terminal Enters global configuration mode.
Router(config)# interface serial slot/subslot/port Selects the interface to configure and enters
interface configuration mode.
• slot/subslot/port—Specifies the location of
the interface. For further information, see the
“Specifying the Interface Address on a SPA”
section on page 18-7.
Router(config-if)# invert txclock Inverts the transmit clock signal. When the
EIA/TIA-232 interface is a DTE, the invert
txclock command inverts the TxC signal the DTE
receives from the remote DCE. When the
EIA/TIA-232 interface is a DCE, the invert
txclock command inverts the clock signal to the
remote DTE port.
The no form of this command changes the clock
signal back to its original phase.
Router(config-if)# clock rate bps Set standard 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.
Any nonstandard clock rates that are entered are
rounded off to the nearest hardware-supported
clock rate. The actual clock rate is then displayed
on the console.
The no form of this command removes a clock rate
that has been set.
Router(config-if)# invert data Inverts the data signal.
The no form of this command disables the
inversion of the data signal.