1Safecom INGRESS GATE technology (Patent p) Essential key element of CMTS-CABLE Modem Synchronization.
2“Noise” in the cable network is one of the greatest hurdles to applying superior, high-speed data, DOCSIS 3.0 services, requiring high integrity signal transmission.Noise ingress reduces network capacity. Removing noise is the greatest challenge faced by Cable operators as they seek to migrate to 64 QAM and eventually to 256 QAM digital modulations.
3Ingress Noise?Perhaps an obvious question?Ingress noise—Over-the-air signals (2-ways radio, Off-Air, FM, Electrical noise , etc.) that are inadvertently coupled into the nominally closed coaxial cable distribution system. Ingress noise is difficult to track down and is intermittent in nature. As much as 80% to 90% of noise and ingress on the plant is generated at the Subscriber site.
4“Funneling Effect”“Funneling Effect” shows the structural defect of “the last two way signal over coax part”. It limits performance of the network, and conceals the superiority of the CMTS-CM Mode.
5Solving the “Funneling Effect” Principle of solving “Funneling Effect” by ingress Gate technology:Cable Modem sends back RF signal use TDM model.Each Cable Modem’s upload time and time slot assignment are controlled accurately by CMTS.At any given time, only one Cable Modem upload signal can take place in the CABLE system.Ingress Gate opens upstream channel only when Cable modem is transmitting.Ingress Gate keeps all other upstream paths closed, therefore only one path at a time can transmit a signal to CMTS.
6Upstream Ingress Noise Test Disconnect from the tap and plug the drop cable directly into the meter. This provides a spectral view of what is getting onto the upstream path from building and transmitting back up the network.Use the 5-65 MHz band.
7Why Ingress Protection? Enables full network capacity utilization on the upstream.Enhances VoIP, DOCSIS and advanced services deployment.Improves Quality & Service.Reduces Operational Expenses (OPEX) for Ingress detection and suppression.
8Safecom’s IngressGate Patent P. technology Gateway that allows carrier signals from the premises into the network only when the home device is actively transmitting to the upstreamBased on the burst nature of the upstream and the random presence of ingress noiseThe technology is embedded into Safecom’s home amplifiersNo need for expensive investment in ingress monitoring systemsResults in dramatic reduction of the ingress levelsNo adverse effect on upstream and downstream signalsFuture implementation into Directional Couplers (DC) situated at the far end of the network, close to the customer premises
9Suggested ChangesAdd upstream spectrum test to each home installation.All ingress noise from 5 to 45 MHz must be lower than 30dBmV.If ingress above design level, simply replace regular home amplifier with safecom IGDA model, Ingress Noise will immediately reduce by min 15dB.If there is no home amplifier installed simply use Passive forward INGRESS GATE 5dB return for blocking all ingress noise from premises.
12Upstream Ingress Protection with RF Active forward/return gain Cost-effective Patent P. technology for ingress suppressionNo need for expensive monitoring or useless detectionSimple integration outdoor or indoorPlug and play deviceBest performance in the marketDrop amplifier integrationPassive Forward/Return available
13Ingress Gate integrated with Drop Amplifier Block Diagram Demo-Home CATV devices NOT activeFrom CATVNetworkHigh Pass FilterHigh Pass FilterFrom customer premisesGate CloseLow Pass FilterLow Pass FilterINGRESS STOPModem NOT activeUpstream ingress gate stops carrier signals from customer premises into the network when the home devices are not actively transmitting.
14Ingress Gate integrated with Drop Amplifier Block Diagram Demo-Home CATV devices activeFrom CATVNetworkHigh Pass FilterHigh Pass FilterFrom customer premisesGate OPENLow Pass FilterLow Pass FilterModem ACTIVEUpstream ingress gate allows carrier signals from customer premises into the network only when the home devices are actively transmitting.
15Ingress gate allows upstream signals from customer premises into the network only when the home devices are actively transmitting.Gate openGate Closed
16Competitive analysis Safecom Company 3Company 2Company 1Usage-based upstream Gate Technology : Open only when Modem transmittingIngress detection and 6dB attenuationFrequency Divisionturn theupstream path to ON, OFF, or6 dB attenuationTechnologyVery LowMedHighCostNoYesNeeds ingress detection systemHome(by customer or technician )NetworkInstallationNo RF disconnections during installationDisconnect RF signal to large area during installationBroadcast continues during installation
17Safecom’s IngressGate™ (Patent p.) vs Opposite Phase IngressGate™ SolutionPatent p.Opposite Phase concept.Operates as upstream gate that opens only when the modem transmits.Opposite phase merging.TechnologyFull15-35 dB ingress isolation.Partial0- 6 dB only ingress reduction.EffectivenessBased on the burst nature of the return path.Assumes ingress noises are at the same phase or from the same source.OperatingprincipleSolves and blocks all ingress noise from customer premises.Cannot solve ingress problems from customer premises.Solution