With 2- and 12-slot models, the Universal Shelf is the best way to grow your network and gain the most out of your investment - now and for years to come. The Universal Shelf offers the benefits of a compact footprint, cleaner cable management, and simplified network management. Its flexibility and space-saving advantages make the Universal Shelf the best way to mix, match and manage a custom configuration of up to twelve T1 and 56k Data/Channel Service Units. It is ideal for large corporate networks, Internet Service Providers (ISPs), and carriers juggling multiple T1 lines.