Trendy cinema auditorium in Madrid , Spain. movie mania Additionally not laid out in any doc are limitations on both microreflections or external signal ingress. Microreflections had been mentioned in Chapter 11 and lead to visible ghosts in analog NTSC footage if the amplitude and delay are sufficient. As shall be seen later on this chapter, additionally they contribute to both group delay and frequency response variations. External signal ingress can occur in both the distribution network or inside subscribers’ terminal gear. Signal pickup in subscribers’ receivers, discussed in Chapter 24, can have an effect on the network if ingressing signals are transmitted out the antenna terminals. It should be famous that, although the FCC does have strict requirements masking signal egress from cable techniques, where robust external signals are current, ingress will often be seen to subscribers before the FCC egress limit is exceeded though the two effects each come up from insufficient shielding and are clearly related.