System Overview:

The main unit consists:

Ø          Two ports STM-1 (or STM-4) optical interface (for 1+1 MSP or SNCP)

Ø          16 ports E1 interface (120 ohm; 75 ohm for option)

Ø          External 2M clock source

Ø          RS-232 and LAN port for network management

Ø          LED display and alarm output

Sigma provides the following expansion cards:

Ø          STM-1o (optical interface)

Ø          STM-1e (electrical interface)

Ø          E1 (can be configured as T1)

Ø          10/100 BASE-T

Ø          DS3 (can be configured as E3)

Ø          V.35 (N x 64K)

Ø          SHDSL