The DSAM Sweep measurement displays the difference (delta) in level from the headend to the field DSAM or vice versa. The main goal is to measure the frequency response of the cable system distribution network. This is done by injecting active sweep points (momentary narrow test carriers) over a range of frequencies at the input of the system. The level of each sweep point is measured at both the input and the output of the system. At the receiving end (output) the two values are compared and the difference is displayed on DSAM, thereby emphasizing any deviation caused by the network. As an alternative to active test sweep points injected around a channel, the actual broadcast video carrier can be used as a reference carrier for that frequency. An optimized sweep plan will include both active sweep points, representing unused frequency bands within the network’s spectrum, as well as reference carriers. This exclusive Stealth Sweep™ technology is patented by JDSU and minimizes any possibility of service interference.

Both directions of the network can be swept. Forward sweep is accomplished with a transceiver and measurement system in the headend or hub site, such as the SDA-5500 Stealth Sweep Transceiver. It transmits and measures active sweep points as well as measures reference carriers. Multiple field DSAMs can be used at the same time with a common SDA-5500. Typically the headend technician or network engineer is responsible for an accurate forward sweep plan within the SDA-5500 transceiver.

Reverse sweep is accomplished in a similar way except that only active sweep points are transmitted and measured by the DSAM field meter and the SDA-5500 receives and measures the sweep points at the headend or hub site. Only a single field user at a time can perform reverse sweep with the SDA-5500. Larger networks typically will use a SDA-5510 Stealth Reverse Sweep Manager to handle only reverse sweep for multiple field users and configure the SDA-5500 for only forward sweep requirements.

The Sweepless sweep (optional purchase required) allows you to get the sweep information without a transmitter.

MAIN FEATURES:

- Display of both forward and reverse sweep modes (Optional Purchase Required)
- One pair of vertical measurement markers.
- Sweep limit value along with a pair of associated horizontal markers and a PASS/FAIL indicator.
- Ability to save multiple static measurement files as well as reference files.
- Ability to view saved files as static files and reference files.
- Ability to Auto Reference, Zoom and Pause measurements.

The DSAM Sweep measurement in conjunction with the appropriate headend SDA equipment provides Forward Sweep and Reverse Sweep measurement modes that measure and display CATV system response.