What is the Telco Syst TMC-254P?
The Telco Syst TMC-254P is a SFP optical transceiver module, listed by the manufacturer as "T-Marc Ethernet demarcation gateway with 4x100 Base TX, 1Gbit un-pop SFP, 1 GBase T ports and E1/T1 CES support". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.