Troubleshooting guide

Troubleshooting Guide
50
Embedded Modules
Table 14: Embedded Module Troubleshooting
Hardware Symptom Probable Cause Corrective Action
Embedded
PRI Module.
Embedded PRI Module
fails to initialize. The
LEDs on the embedded
PRI (Framer) module are
off. The trunks for the
module are unassigned.
Module has failed to initialize
because the link descriptor is
not programmed correctly.
Check the programming for the link
descriptor that is assigned to the
embedded PRI (Framer) module:
For T1 only:
• B8ZS Zero Code Suppression:
Yes
• Operation Mode: DSX-1 or CSU
• CSU Tx Line Build-Out (dB.): This
T1 parameter ensures reliable
operation of the network. Select
from 0, 7.5, 15, or 22.5 dB. Your
carrier can advise you of the
correct setting. The default is 0
dB.
• DSX-1 Line Length (Ft.): 0-133
feet.
• Extended Super Frame: No
• Inverted D channel (DPNSS
only): Yes
For E1 only:
• CRC-4 Enabled: “No” in North
America; “Yes” in Europe
• E1 Line Length (Ft.): 0-133
• E1 Impedance (Ohms): 120
Note: For E1 only, 90% of E1
service providers in Europe require
that you set the “CRC-4-Enabled”
option to “Yes”. Please consult with
your service providers for proper
settings.
Note: For DASS/DPNSS (E1), set
the “CRC-4 Enabled” option to “No”.
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