Ports 20 RJ-45 autosensing 10/ 100 ports( IEEE 802.3 Type 10BASE-T, IEEE 802.3u Type 100BASE-TX) , Media Type: Auto-MDIX, Duplex: half or full; 4 dual-personality ports, each port can be used as either an RJ-45 10/ 100/ 1000 port ( IEEE 802.3 Type 10BASE-T, IEEE 802.3u Type 100BASE-TX, IEEE 802.3ab 1000BASE-T Gigabit Ethernet) , or an open mini-GBIC slot ( for use with mini-GBIC transceivers) ; 1 RS-232C DB-9 console port Mounting Mounts in an EIA-standard 19 in. telco rack or equipment cabinet ( hardware included) ; horizontal surface mounting only Memory and processor Management module : Stackable memory and processor: Freescale PowerPC 8540 @ 666 MHz, 4 MB flash, 128 MB compact flash, 256 MB DDR SDRAM Latency 100 Mb Latency: < 3.4 ï ¿ ½ ï ¿ ½ s ( LIFO 64-byte packets) ; 1000 Mb Latency: 95% reduction, 0.5 period; 30% reduction, 25 periods; EN 61000-3-2, IEC 61000-3-2; EN 61000-3-3, IEC 61000-3-3 Dimensions and weight Minimum dimensions ( W x D x H) 44.3 x 39.2 x 4.4 cm Weight 5.4 kg