Testing Ethernet circuit (Baseband) is totally different from broadband circuit. However, if you have Ethernet tester (such as Acterna), you can do RFC testing to prove continuity. 
Here is how to put a VLAN loop at tellabs. In this example,
For example>
Device#1 <--->(Side id 1:ge-1/1/1/1, VLAN111) Tellabs 8860 (Side id 2:so-2/2/2/2:1, VLAN222) <--->Device#2
1. Delete current circuit
Tellabs_8860> enable
Tellabs_8860> config ckt name CiscoNET.Link admin disable
Tellabs_8860> config no ckt name CiscoNET.Link