Cisco Switching/Routing :: Interface Gi On SMES3G-24P 3925

I just receive a new Cisco 3925 with a etherswitch module 24 port : 

SM-ES3G-24-P,I successfully boot the switch module and gain access to it.

I found some documentation on CCO but I don't sorted out this small information :,

Switch#sh cdp neig Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,                   D - Remote, C - CVTA, M - Two-port Mac Relay
 Device ID        Local Intrfce     Holdtme    Capability  Platform  Port IDRouter           Gig 0/26          143             R S I  CISCO3925 Gig 2/0Switch#

The Router is connected to the switch module via a HIMI :

The Cisco enhanced EtherSwitch service modules also provide a physical Gigabit  Ethernet serializer/deserializer integrated circuit transceiver (HIMI)  interface. In the Cisco 2900 series and Cisco 3900 series routers, the HIMI link  on the Cisco enhanced EtherSwitch service modules is connected to the router  internal Gigabit Ethernet backplane. This link is used for interconnection  between other interface cards or network modules attached to the router Gigabit  Ethernet backplane bypassing the router host CPU; thus, increasing CPU  performance by decreasing CPU processing.

 If I do a sh ip int brief on the switch, I have 26 interface but only 24 are physicaly present on the front.The type of the 0/25 and 0/26 are the same : media type is 1000BaseXThe interface gi 0/26 is up up but the 0/25 is down down.