Carrier grade groomerII – installation guide
2.7
Common set-up problems
2.7.1 System TDM clock not configured
Where one or more E1 or T1 trunks are connected to network equipment, correct
operation depends on TDM clock synchronisation.
A common set-up problem concerns the configuration of the system TDM clock which
is required to synchronise the system to other E1/T1 equipment. This should be set to
recover the clock from a network source or PSTN, where available. The recovered
clock source will default to E1/T1 trunk 1 and may be re-configured to any other
connected E1/T1 trunk via the System Administration browser interface.
It is not possible to synchronise one system to multiple network sources that are not
synchronised to each other. An example of this scenario can be two or more E1/T1
trunks, each connected to a separate carrier network.
2.7.2 ISDN network/user conflict
Many E1/T1 ISDN signalling protocols have asymmetric user and network end
configurations. By default, the GroomerII will be configured to user end where there is
a configuration option. The system configuration for each E1/T1 ISDN interface can
be changed via the system configuration file.
2.7.3 CAS network conflict
Some E1/T1 CAS signalling protocols have configuration settings that may prevent
correct operation if there is a mismatch between the GroomerII and the network.
Please consult the local E1/T1 network operator for CAS signalling requirements. The
GroomerII configuration for each E1/T1 CAS interface can be changed via the system
configuration file.
2.7.4 Ethernet IP address conflict
All Ethernet end points in a network require a unique IP address. Consult the network
administrator if there is an IP address conflict. This may occur if multiple GroomerII
units are installed at the same time, so it is good practice to plan IP address
configuration for each system at an early stage of installation.
2.7.5 Ethernet IP address out of range
All Ethernet end points in a network require a valid and unique IP address. Consult
the network administrator for information on the available range of IP addresses.
23 of 44
