“We proposal to buy H3C S7510E new switch for AY108AV because we are using the type for our production line, also consider equipment maintenance and after service,”I do not think this is a very valid reason to have such high end level Switch to support AY108AV until you support more detail technical reason. I do not think except H3C S7510E and other type (or brand)of Switch device will make Inventec out of “equipment maintenance and after service”. I do not think H3C provide “maintain and after service” only on H3C S7510E??? Inventec is still using 46/69=66.666% brocade SX-1600 which is really out of maintain for whole production lines, why don’t you consider to replace them all to H3C S7510E for “equipment maintenance and after service”?so I could not accept this reason until you could support more reasonable reason.