Configuring the 2-Port and 4-Port T3/E3 Serial SPA
Configuring Invert Data
Delays between the terminal equipment (TE) clock and data transmission indicate that the transmit clock
signal might not be appropriate for the interface rate and length of cable being used. Different ends of the
wire may have variances that differ slightly. Invert the clock signal to compensate for these factors. To
configure invert data, use the following commands:
Command
Router# configure terminal
Router(config)# interface serial slot/subslot/port
Router(config-if)# invert data
Verifying Invert Data Setting
Use the show running configuration command to verify that invert data was set on the interface:
Router# show running configuration
interface Serial2/0/0
ip address 51.1.1.1 255.255.255.0
logging event link-status
dsu bandwidth 44210
framing c-bit
cablelength 10
clock source internal
invert data
mdl string eic tst
mdl string lic 67
mdl string generator test
mdl transmit path
mdl transmit test-signal
no cdp enable
!
Configuring the Trace Trail Buffer
Configure Trace Trail Buffer (TTB) to send messages to the remote device. The TTB messages check for the
continued presence of the transmitter. To configure TTB, use the following commands:
Command
Router# configure terminal
Router(config)# interface serial slot/subslot/port
OL-14127-17
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Optional Configurations
Purpose
Enters global configuration mode.
Selects the interface to configure and enters interface
configuration mode.
Inverts the data stream.
Purpose
Enters global configuration mode.
Selects the interface to configure and enters interface
configuration mode.
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