The Traffic Control Plus feature for the New DSP Family of field analyzers provides a real-time view of the return band for 100% coverage so technicians can see even the shortest cable modem bursts and ingress even under the busiest upstream.
The Traffic Control Plus feature provides a real time view of the return band for 100% coverage so technicians can see even the shortest cable modem bursts and ingress even under the busiest upstream. While the downstream typically contains signals that are transmitting from the MSO to the customer, the return band is for cable modem signals transmitted from the customer back to the MSO. While the signals in the forward band are constant and easy to detect, the signals in the return tend to be bursty. When attempting to use a standard spectrum analyzer to measure the return band, this bursty nature of upstream signals can cause problems because bursty upstream traffic can be as short as 6.25 microseconds.
If there is enough upstream traffic, standard return spectrum analysis may catch a full channel or it may only catch a single slice of the channel. This makes it very difficult to differentiate traffic signals, noise, and ingress under the traffic when using a standard return spectrum analyzer.
As you can see in Figure 1, the Upstream TraffiControl Plus feature displays the maximum peak (red), maximum constant (green), and average constant (blue) signals that are present in the upstream. Typically the maximum peak signal shows an outline of the upstream carriers while the maximum constant signal shows the noise floor for a bursty signal or some sort of continuous signal and the average constant signal shows the noise floor, ingress under the carrier and other unwanted signals.
Along with the previously described traces, the Traffic Control Plus feature also displays a waterfall graph that uses color to represent the prevalence of a signal and shows the distribution of spectral power which can help technicians find signals hiding beneath the traffic. In the example shown in Figure 2, the colors have been set to a blue, yellow, and red pattern; where the blue section represents the area of the spectrum that the signal was most prevalent, the red indicates the least prevalent signals, and the yellow section are signals that were in the middle.
The prevalence of the signals can be easily adjusted by the technicians to give them a better visual indication as to whether events are occurring frequently, infrequently, or somewhere in between. This normalization value is adjustable from 0.01% to 100% and in Figure 3, normalization is set to 10%. In this case, the blue section shows the most prevalent signal power that was present at least 10% of the time, which was an infrequent presence of modem traffic within the maximum peak envelope of the upstream carriers.
Additionally, Figure 4 shows what a technician might see when there is ingress under a carrier, which has been highlighted as an area of interest using adjustable markers. You can begin to understand the affect this noise is having on the upstream carrier when you compare the signal-to-noise measurements from Figures 3 and 4. The noise that is present under the upstream channel in Figure 4 has severely impacted the signal-to-noise ratio, which would have a negative impact on the quality of service for this channel when compared to the signal without noise shown in Figure 3.
All repairs carry a 90-day warranty against defects in replacement parts and repair workmanship.
All Trilithic products are warranted against defects in materials or workmanship for a minimum of one year after shipment to the original purchaser.
Trilithic's obligation under this warranty is limited to the repair or replacement of the product after being returned to our factory, and Trilithic determining the product be indeed defective.
This is Trilithic's sole warranty and is given in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose and sets forth the buyers sole remedy.
|120 DSP||180 DSP|
|Field Analyzers||Leakage Equipment||Monitoring & Maintenance|
|360 DSP||Seeker Lite²||8310 RSA|
|720 DSP||Seeker||8300A FST|
|1G DSP||Seeker D||860 DSPh & 860 DSPh Input Expander|
|802 AWE||Seeker D Lite & Seeker D Lite Source Transmitter||9581 SST|
|RSVP²||Seeker HL & Seeker HL Source Transmitter||8380 RPC|
|Seeker MCA III|
All Specially Configured Dell PowerEdge 2U Rack Mount Server products are warranted against defects in materials or workmanship for a minimum of three years after shipment. Dell provides next business day, parts and labor, on-site response for the following Trilithic products.
|LAW Server Package|
|ViewPoint Integrated Server Package|
Trilithic, Inc. ("Trilithic") warrants to the buyer that the product will be free from defects in materials and workmanship, under normal use, operating conditions and service for a period of one (1) or two (2) years from date of delivery based on the type of product as listed above. Trilithic reserves the right, before having any obligation under this limited warranty, to inspect the damaged product, and all costs of shipping the product to Trilithic for inspection shall be borne solely by the buyer. Trilithic's obligation under this limited warranty shall be limited, at Trilithic's sole option, to replacing or repairing the product, or to replacing or repairing any defective part. F.O.B. Indianapolis, Indiana. If neither of the two options is reasonably available, then Trilithic, in its sole discretion, may provide a prorated refund to the buyer of the purchase price of the product, as evidenced by the proof of purchase, less any applicable service fees in accordance with the following schedule:
Product with two (2) year warranty: months 0-3 = 100%; months 4-12 = 50%; and months 13-24 = 25%.
Product with one (1) year warranty: months 0-1 = 100%; months 2-6 = 50%; and months 7-12 = 25%.
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