Your question about Siemens S30810-Q2136-X SCC

The Stream Control Central board SCC for Hicom 300/300E, is the interface between the central Processor DM80 and the peripheral boards of the Hicom 3X3. 

Functions of the board are:

• Clock generator SCG (Small Clock Generator)
• DCL (Data Communication Link)
• Switching network MTS (Memory Time Switch)
• Switching network MTS (Memory Time Switch)
• LTUC sub-functions (Line Trunk Unit Controller)
• SIUCO functions (Signaling Unit and Conference)