[ns] Difference of SMAC(Sensor MAC) with IEEE802.15.4 in WSN

I want to know difference of SMAC(Sensor MAC) with IEEE802.15.4 in WSN.In other words, does 802.15.4 cover SMAC or inverse??

[ns] Simulate a WSN with 16 nodes in a synchronous

Dear all I simulate a WSN  with 16 nodes in a synchronous, But the output results show that in the first 12 nodes are synchronized!!! I don't know that my output is correct or not.Please help me. best regards.

[ns] Simultaneous use of two protocols

Dear all I've changed a parameter of SMAC in NS2 that I call it SMAC1,I want to use simultaneously of both protocols(SMAC and SMAC1) in my tcl program. plz help me that how to use  of both protocols!!! Best Regards.

[ns] change time of sleep of node in SMAC in NS2

Dear all I want to change time of sleep of node in SMAC in NS2. Please help me to do it.

[ns] change time of sleep of node in SMAC in NS2

Dear all I want to change time of sleep of node in SMAC in NS2. Please help me to do it.

[ns] can I decrease value difs in SMAC in practice??

ِDear all I want to know that can I decrease value difs in SMAC in practice?? Please help me!!! Best Regards