The 4-port MDA provides four ports configurable as DS-3 or E-3. The MDA has eight (8) 1.0/2.3 connectors and accepts up to eight (8) DS-3/E-3 coax patch cables.
Each physical DS-3 connection can support a full clear-channel DS-3, or it can be channelized into independent DS-1/E-1 data channels. Each DS-1/E-1 channel can then be further channelized down to DS-0s. All DS-0 channels within a DS-3 port must be configured for the same channel speed.: 56 kb/s or 64 kb/s. The 56 kb/s speed value is only supported on DS-1 channels (ESF and SF framing) and not on E-1 (G.704) channels. Also, 56 kb/s channels cannot be part of a bundle. E-3 ports do not support channelization, only clear channel operation. This MDA is supported on the 7750 SR-7/12 platforms.