Advantech L-Band Satellite Modulator Specifikace stáhnout pdf (Strana 42)

Front Panel Monitoring & Control

Property Status Description

None The block cipher is not engaged

PMT info

Too many

PMT(s)

too many PMT(s) are received for the playout RAM (overflow)

Incorrect PMT(s)

A PMT cannot be modified to add/remove BISS SI (PIDs listed in the PMT

would not be ciphered/deciphered)

Missing PMT(s) A PMT listed in the PAT could not be retrieved

OK All is OK

3.3.2.5.2 Configure

3.3.2.5.3 BISS Mode Selection

The options for the BISS mode are Off, Mode-0, Mode-1, Mode-E, Odd/Even-1, Odd/Even-E, User-

1 and User-E. Depending upon the selection, the available options will change

Note

All session words, injected ID and Encrypted session words cannot be read back and are not echoed

back to the display. These values are also not stored in the profiles but will be reused after a power

cycle. To comply with the specification the keys cannot be changed more than ten times in a 5-minute

period and that there is a minimum of 10 seconds between changes. The keys are transmitted in the

clear via the GUI so should be used with caution, perhaps by setting the Injected ID up only on the

front panel and never via the GUI.

3.3.2.5.4 Off

BISS is fully disabled and the transport stream will be unmodified. If BISS is subsequently enabled

then the modification in the transport stream may cause a momentary glitch in the video. It is

preferable to use BISS-0 which will modify the transport stream without encrypting the video.

3.3.2.5.5 BISS-0

The transport stream will not encrypt in this mode but is modified to add signalling about BISS. In

this mode encryption can be enabled seamlessly.

3.3.2.5.6 BISS-1

The transport stream is encrypted using the session word which is a 12 digit hex value. If the key is

not present then the last entered value will be used. This session word is independent from the

key generated when using BISS-E and will be retained.

3.3.2.5.7 BISS-E

The transport stream is encrypted by a calculated session word. This session word is generated

from an injected ID and an Encrypted session word. This is fundamentally more secure as both

the Injected ID and Encrypted session words are required for decryption and each receiver

could have a unique Encrypted session word. The Injected ID is a 14 digit Hex value and the

Encrypted Session Word (ESW) is a 16 digit hex value. If the key or the ID is not present then the

last entered values will be used.

3-12 SBM75e Series Modulator Installation and Operation Manual

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Advantech L-Band Satellite Modulator Specifikace Strana 42