of forwarding some data blocks to other access devices in the same shelf and will be explained with reference to fig5 in another embodiment of the invention shown in fig5 several user access devices 104 in one location two of them are shown are grouped together in a shelf as all the user access devices 104 of a same shelf share the same bus marked b in this case the e 1 data is received by a transceiver 120 of only the first access device in the as this device will be called a master and marked 104 m the transceiver 120 of the access device 104 m in the shelf is provided with the data block numbers that are destined to users of all access devices 104 in the as not only the users of the first access device 104 m itself the transceiver 120 then selects the said data blocks and forwards them to the tsis 126 of this card as before the tsis 126 is provided with the information for forwarding the selected data blocks to users of the same access device 104 and accordingly does so as described before with respect to the embodiments of fig2 and 3 the data blocks that are not destined to users of the first access device 104 m in the shelf are forwarded via.