This is the name of the resolved CoS map used by the tunnel, but per its own description this object only actually applies on Ciena's 39XX and 51XX chassis families -- on other platform families (like the 87XX, which uses a different resolved-CoS-profile mechanism per the related objects below) this field is not meaningful. An admin auditing tunnel QoS across a mixed fleet of Ciena hardware needs to know which platform a given device is before interpreting this value, since the same tunnel concept is represented differently depending on chassis type. Blank or stale values here on an 87XX device would simply reflect that this object doesn't apply to that platform, not a misconfiguration.