Cisco Headend System Release 2.7 Design Guide
Chapter 4 Troubleshooting SDV System Issues
82
4002915 Rev B
Loss of Two-Way Connectivity
Description
Subscribers are unable to use the DHCT in an interactive mode.
Possible Causes
The SDV server may be down.
Note: If the loss of connectivity only affects SDV channels, the SDV server may
be down. See Cannot Tune to SDV Channels (on page 81) for troubleshooting
information.
Note: If the loss of connectivity only affects SDV channels, the SDV server may
be down. See Cannot Tune to SDV Channels (on page 81) for troubleshooting
information.
The DHCT is not receiving UNcfg (User to Network Configuration) messages
from the DNCS.
from the DNCS.
RF levels may not be set correctly.
The QPSK has a modulator/demodulator configuration issue.
Diagnosing the Issue
See the following table to diagnose why the DHCT may not be in two-way mode.
Access the following
diagnostic screen.
Evaluate the
following field.
What value do I want
to see?
Page 2
–Post and Boot
Results
UNcfg
READY
—desired value;
DHCT is in two-way mode
B'cast only
—check the
DNCS configuration and RF
levels
levels
SEARCHING
—not receiving
UNcfg message. Check the
RF signal levels. If the signal
levels are within range and
you still have an issue, call
Cisco Services
RF signal levels. If the signal
levels are within range and
you still have an issue, call
Cisco Services
Page 4
–Statuses and
Network Parameters
IP Address (in RF Network
section)
section)
IP Address
—DHCT
successfully booted in two-
way mode
way mode
Note: If No IP Address
appears, the DHCT did not
boot in two-way mode.
Contact your DNCS
administrator to verify that
the DHCT is enabled for two-
way communication.
appears, the DHCT did not
boot in two-way mode.
Contact your DNCS
administrator to verify that
the DHCT is enabled for two-
way communication.