We have little understanding of this model and specs, however we know the previous owner (very responsible government funded corporate client) and we have been reliably informed the switch operates as per new. Even so, TeleBiz provides a 100% unconditional money back guarantee if not purchaser not satisfied with the purchased product (valid 30 days from receiving the equipment). Thereafter TeleBiz will guarantee the equipment for 3 months (as in repair, replace or refund). Includes approx. 20 robber connectors. Switch does not include manual although we note manuals are readily available over internet.