Patent ID: 11937094
Assignee: CABLE TELEVISION LABORATORIES, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. The method of claim 1, the SEM being a single-interior-non-transmitted-channel SEM defined for a first frequency, a second frequency, a third frequency, a fourth frequency, and a fifth frequency; wherein:
a first attenuation includes 0 dBr at the first frequency and −20 dBr at the second frequency, the second frequency being at least 1 MHz greater than the first frequency;
a second attenuation includes −20 dBr at the second frequency and −23 dBr at the third frequency, the third frequency being at least 10 MHz greater than the first frequency;
a third attenuation includes −23 dBr at the third frequency and −20 dBr at the fourth frequency, the fourth frequency being at least 19 MHz greater than the first frequency; and
a fourth attenuation includes −20 dBr at the fifth frequency and 0 dBr at the fifth frequency, the fifth frequency being 20 MHz greater than the first frequency.