SM-D-ES3-48-P Cisco 48-Port Fast Ethernet EtherSwitch Service Module, PoE

The SM-D-ES3-48-P is a Cisco EtherSwitch service module with 48 10/100 Ethernet ports, double-wide, Layer 2 and Layer 3, with PoE support. One double-wide module goes into a Cisco 2921, 2951, 3925 or 3945 router. In a 3945 the slot divider between slots SM3 and SM4 comes out first, and in a 3925 the blank panel to the right of SM2 is removed.

All 48 ports are RJ-45 jacks that run at 10 or 100 Mbps in half or full duplex, with autonegotiation as the default and the attached device within 100 meters (328 feet). Each 10/100 port can power IEEE 802.3af-compliant and noncompliant PoE devices such as Cisco IP phones and access points. The router feeds -48 V to the module through its AC-PoE power supply, and PoE is set port by port.

As a 48-port module it takes SFP optics (1000BASE-SX, LX, LH, ZX and T, plus GLC-GE-100FX, GLC-100BX-D and GLC-100BX-U), and the SFP slots work as gigabit uplinks. The module has no physical console port and is configured from a console session through the host router. It runs either the IP base or the IP services feature set. Routers that take the module are in Cisco routers, and other EtherSwitch service modules are in Cisco switches.