Cisco Enhanced EtherSwitch Service Module. Networking standards: IEEE 802.1p, IEEE 802.1Q. Dimensions (WxDxH): 412 x 207 x 40 mm. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 5 - 85 %. Safety: UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1