Cisco Multi-Stream CableCARD Module Guida All'Installazione
Chapter 4 Configure the PCG on the DNCS or ISDS
30
78-4017672-01 Rev E
min_CP_duration. The minimum crypto-period (CP) duration is
communicated at channel setup by the ECMG to the SCS to indicate the
minimum supported amount of time a control word shall be active before it
can be changed. A value of 5000 ms or greater is supported on the PCG.
Requirements:
communicated at channel setup by the ECMG to the SCS to indicate the
minimum supported amount of time a control word shall be active before it
can be changed. A value of 5000 ms or greater is supported on the PCG.
Requirements:
–
The min_cp_duration should be less than or equal to the crypto-period
defined on the SCS. We recommend a value equal to the crypto-period
defined on the SCS.
defined on the SCS. We recommend a value equal to the crypto-period
defined on the SCS.
–
This value shall be greater than the max_comp_time parameter of the
same channel_status message.
same channel_status message.
–
The nominal Crypto period duration (Nominal_CP_duration) and the
actual Crypto-period (CP_duration) shall in any case be greater than or
equal to all the min_CP_duration specified by the ECMGs during channel
setup.
actual Crypto-period (CP_duration) shall in any case be greater than or
equal to all the min_CP_duration specified by the ECMGs during channel
setup.
Once every CP cycle:
–
The SCS scrambles the incoming TS using the CW it submits to the PCG,
which encrypts it into a PowerKEY ECM provided to the SCS.
which encrypts it into a PowerKEY ECM provided to the SCS.
–
The SCS requests an ECM by providing the CW along with an access
criteria (AC) to the PCG via the SCS-interface.
criteria (AC) to the PCG via the SCS-interface.
–
The PCG uses the AC to identify the program/service, encrypts the CW
using an entitlement control message (ECM) for the service, and provides
the ECM to the SCS.
using an entitlement control message (ECM) for the service, and provides
the ECM to the SCS.
–
The SCS inserts the ECM into the TS based on the ECM_rep_period
setting.
setting.
Vendor-specific Recommendations:
–
If your site uses either SCS devices from one of the following vendors, set
the min_CP_duration per the following guidelines:
the min_CP_duration per the following guidelines:
Avail-TVN: 10,000
Harmonic, Inc.: 30,000
CW_per_msg. The number of control words (CW) needed by the ECMG per
control word provision message.
control word provision message.
delay_stop. This signed integer represents the amount of time between
beginning a Crypto Period and broadcasting the ECM. If it is positive, the
ECM broadcast ends after the Crypto Period ends. If negative, the ECM
broadcast ends before the Crypto Period ends. The ECMG communicates this
beginning a Crypto Period and broadcasting the ECM. If it is positive, the
ECM broadcast ends after the Crypto Period ends. If negative, the ECM
broadcast ends before the Crypto Period ends. The ECMG communicates this