Verilink QUAD DATA (880-503319-001) Product Manual - Manual (Page 41)

Diagnostics
Verilink QUAD DATA User Manual 4-7
network. If it does not, it is in the node. If the network facility
is shared between the troubled circuit and other applications;
check those applications to see if they are in trouble.
Other Tests The QUAD DATA module is always used with other application
modules which have network ports. These modules also offer
diagnostic functions for testing network circuits. If the procedures
in this section do not resolve any issues you may have, see the
manual for the module to which the data port is mapped.