DT Etherlink IV User Manual- 32 -ONLY PORTS WITH ROOT AND DESIGNATED ROLES WILL FORWARDDATA PACKETS. PORTS WITH ALTERNATIVE ROLE WILL BE INBLOCKED STATE3.2.3 An Integrated Switch of 64-kbit/s Time Slots3.2.3.1 E1 Transmission Mode (only E1 Time Slots)In this mode, only time slots of E1 data streams are transmitted over SHDSL lines according to ITU-T Rec. G.991.2.Table 3.10 Comparison of SHDSL data rate and number of possible time slots of one E1 stream3.2.3.2 E1, Nx64/RS-232/RS-485 and Ethernet Simultaneous Transmission ModeThe system supports simultaneous transmission of E1 time slots, Nx64/RS-232/RS-485 data andEthernet data (from the ports WAN1, WAN2, WAN3, WAN4, and the internal Ethernet switch) intoan SHDSL line. This mode means time slot multiplexing from E1, Nx64/RS-232/RS-485 andEthernet network interface into the SHDSL line. The distribution of SHDSL time slots is performedas follows: time slots of the first E1, chosen for transmission in the SHDSL line interface in the ascendingorder, are transmitted in time slots from 0 to m1-1 time slots of the second E1, chosen for transmission in the SHDSL line interface in theascending order, are transmitted in time slots from m1 to m1+m2-1 Nx64/RS-232/RS-485 data is transmitted in time slots from m1+m2 to m1+m2+m3-1 Ethernet data is transmitted in time slots from m1+m2+m3 to n-1Here n is the total number of transmitted SHDSL time slots m1 is the number of time slots from the first E1 selected for transmission into SHDSL m2 is the number of time slots from the second E1 selected for transmission into SHDSL m3 is the numer of time slots required for Nx64/RS-232/RS-485 dataNote: A part of time slots of an E1 interface can be used to transmit data from the WAN2 port of theinternal Ethernet switch.Time slots of E1 data streams(first E1 / second E1)Total number of transmittedtime slotsMinimal required SHDSL datarate transmitting this number oftime slots (kbit/s)0,1,16 / 0,1,2,3 7 4560,1,2,3,31 / none 5 3280-29,31 / none 31 19920-31 / 0-31 64 4104
