The YTD423, the heart of the board, is Yamaha's high performance LSI for ISDN BRI user network interface function that includes Layer 1, Layer 2 and HDLC for 2 B-channels
1SDN routers may also come with a number of software-based options, including B-channel
aggregation, data compression and simplified set-up for Ethernet and token-ring LANs.
Neffe (VE 3 KV) - renewal of ties with the process of renewal - Renewal of rails - Lot 3: Line 43 : Shore / Marloie - Section : Bomal / Marenne - U channel and B-channel
station in Melreux ( VE 3KV ) - renewal of ties with the process of renewal and renewal work of crossing.