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EMM is entitlement management message, and ECM is entitlement control message. These are messages from the headend to the cable card to allow the card to decrypt encrypted programming.

Here is information I have gathered from my Comcast experience, your CP screen should look like this (for SA systems) when tuned to a subscribed encrypted channel:
Auth Status:CP Auth Received
Prog number: (varies)
CCI byte: 0x02 (also varies, but seems to be 02 for all scrambled channels)
ECM count: not zero
EMM count: not zero
Decryption status:OK
PowerKey status:Ready
EID: varies but should NOT be 0xfffffff
MKS period: 1000 seconds (varies?)
KSE count:1

Note that the ECM and EMM count will increase the longer you are on a scrambled channel, but the CP screen is static and does not change (refresh). To see the numbers change, hit CLEAR (to exit) and then go back into the screen.

If the EMM and ECM counts are zero and you are getting 'no ECMs detected' -
You are on an unscrambled ('clear') channel
Your card is not authorized to decrypt the channel - either you are not subscribed to that channel, or the card is not properly configured

If you google 'emm and ecm' you will find some interesting documents explaining the entire process in detail.
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