MRJ21

For a long time now, customers have showed interest in the BigIron RX Telco blade, known as RX-BI48T for it's extremely high GbE port density. In only one chassis slot, you can run up to 48-ports of GbE copper. However, because Foundry never shipped these cards with the proprietary MRJ21 cables that are needed to use this card, demand has been relatively soft on the secondary market.