Cabletron DDS Line Mode

1.3.6.1.4.1.52.4.1.2.7.2.5.1.1.3

DDS-PRI is full duplex 56k link, No framing in loop data so loop speed is also 56k. Data stream: --d1 d2 d3 d4 d5 d6 d7-- DDS-SC is also full duplex 56k link, requires framing bits to distinguish between primary and secondary channels. --d1 d2 d3 d4 d5 d6 d7 F C/S-- where F is framing bit and C/S for secondary channel as well as used for control bit. With these two extra bits the loop speed is increased to 72k. primary channel rate is 56k. DDS-CC is full duplex 64k link. Does not require framing bit but uses a same format as SC, nineth bit position is lumped with primary channel and not used for control. Loop speed is 72k, Primary channel rate is 64k. --d1 d2 d3 d4 d5 d6 d7 F d8--