Specifications

Installation and Operation Manual Chapter 5 Configuring for a Typical Application
IPmux-8/16 Ver. 6.00 Checking the Application 5-7
4. If you have sequence errors and underflows:
 Check under LAN Statistics that your Ethernet connection is full duplex. If it
is detected as half duplex, this could indicate that a problem exists in the
autonegotiation mechanism between IPmux and the switch/router. In this
case, disable autonegotiation for both devices, set default type for IPmux to
full duplex, and either 10 Mbps or 100 Mbps, according to the
switch/router capability.
 Check under LAN Statistics that only the correct frames and correct octets
are received and transmitted. If other counters are rising, check the physical
connection of the IP side (cables, switch/router port, etc.).
5. If you have underflows or overflows at set intervals of time:
 Check that all IPmux units are configured to the correct clock modes.
 Check that the TDM device is configured to the correct clock mode.
6. If you have underflows or overflows at non-set intervals of time:
 Try to gradually increase the jitter buffer size.
 Check that there are no E1alarms (such as LOS or LOF), through the IPmux
E1/T1 Statistics. If problems do exist on the E1/T1 level, check both physical
connections (cables and E1 ports) and E1/T1 parameter configuration
compatibility between the TDM equipment and the IPmux units (such as
CRC and CAS Enable/Disable).
 Check that the bundle connection configuration was made correctly.
Step 2 – Using TDM Equipment Statistics and Functionality
After you have verified all the issues in step 1, check the following:
• Check that there are no alarms or BER on the TDM equipment.
If you are using a PBX check voice quality. If an echo exists, verify that you haven’t
configured the jitter buffer size to be too large (remember that the initial
configuration should be 3 ms, unless it is required to be larger).