product description cisco wan network interface module expansion module device type expansion module form factor plug in module ports combo gigabit sfp x 2 dimensions wxdxh 89 cm x 184 cm x 32 cm weight 252g data link protocol gige designed for cisco 4451 x integrated services router 4451 x integrated services router security bundle 4451 x integrated services router voice and video bundle 4451 x integrated services router voice security bundle