I joined a conference bridge with the customer for a hotcut of FastEthernet service. Customer needed to move from old Cisco router to new Cisco router on Sprint side to support Class of Service for customer VOIP application. Involved at the Sprint switch site was a Transition Networks CBFTF-1014-100 media converter. After swinging the fiber crossconnect to the new Sprint router the FastEthernet port came up/up with good ping to Sprint side IP address, however, it was dropping packets to customer side IP address.
Sprint changed to half-duplex and problem cleared even though customer router remains on full duplex. Customer circuit is up and passing traffic on new router at this time.
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