In the same physical space, the switches can be scaled down to 16 or 8 ports. With the ability to withstand extreme environmental conditions (temperatures between -40°C to +75°C), the EISB-B-Line series is available in several models, from all-twisted-pair 8, 16 and 24-port models to a mix of twisted-pair and fiber optic models of the same port count in a rugged aluminum enclosure. The units can be powered from either wide-range, low-voltage AC (8-24VAC) or DC (10-36VAC) power sources.