Information Technology Reference
In-Depth Information
Table10-8
SDLC: Router Cannot Communicate with SDLC Device (continued)
Possible Problem
Solution
Link-layer
problem (router is
secondary)
(continued)
The SCT/SCTE setting might be changed with a jumper or with
the software configuration command
dce-terminal-timing
enable
, depending on the platform. Some platforms do not allow
you to change this setting.
Example:
The following example prevents phase shifting of the data with
respect to the clock:
interface serial 0
dce-terminal-timing enable
5.
Use a breakout box to check for CTS high on the line.
6.
Make sure that both the device and the router are using the
same signal coding (NRZ or NRZI). NRZ is enabled by
default on the router. To enable NRZI encoding, use the
nrzi-encoding
interface configuration command.
Example:
In the following example, serial interface 1 is configured for
NRZI encoding:
interface serial 1
nrzi-encoding
7.
Try reducing the line speed to 9600 bps using the
clock rate
interface configuration command. Use the
clock rate
interface configuration command to configure the clock rate
for the hardware connections on serial interfaces such as
NIMs and interface processors to an acceptable bit rate.
Syntax:
The following is the syntax of the
clock rate
command:
clock rate
bps
Syntax description:
•
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
Example:
The following example sets the clock rate on the first serial
interface to 64000 bits per second:
interface serial 0
clock rate 64000
Link-layer
problem (router is
secondary)
(continued)
8.
Make sure that cabling is correct, securely attached, and
undamaged.
1.
DCE=data communications equipment
