19 inches wide and 2U high, 8E1s and 1+1 optical interfaces available with ASL function. 10/100 Base_T Ethernet, V.35, and V.24/RS232 on chassis. AC220V/110V and DC48V power feeding for 1+1 protection (AC+DC, DC+DC, AC+AC).LCD and LED alarms.15×2 unit cards for PCM30 system. Slide down design for front panel and all modules are hot-swap.