13
Digital Services Activation Meter (DSAM)
www.jdsu.com/nse
Enhanced Downstream Spectrum
Technicians must be able to view spectrum activity and troubleshoot
whether channels have shifted; carriers are missing, or there are
in-channel frequency response problems. Because most technicians
do not require an expensive full-featured spectrum analyzer, the DSAM,
with its enhanced downstream spectrum, provides technicians with an
“everyday” spectrum analyzer. Users can choose between two resolution
bandwidths (RBW) settings, 330 kHz or 30 kHz, and modify the amount
of time spent measuring each frequency step, also known as the “dwell
time” of the analyzer, in settings from 1 to 25 milliseconds. It also lets users
see 4 MHz to 1 GHz, in 10 or 50 MHz steps, without switching test modes.
Furthermore, when viewing the return path frequencies, technicians can
activate an internal low pass lter to eliminate noise caused by the higher
frequencies, along with an internal pre-amp, providing a more accurate
view of upstream spectrum characteristics.
With the DSAM’s enhanced downstream spectrum mode technicians are
equipped with an “everyday” spectrum analyzer.
FieldView
™
Option
Field View enables communication between the JDSU PathTrak return
path monitoring system and DSAMs. A JDSU HSM-1000 sends spectrum
measurements from PathTrak to the eld meter, where the DSAM
displays the results. By comparing local spectrum measurements to
those from PathTrak, eld technicians can quickly resolve return path
ingress problems.
The optional Field View capability greatly improves the success rate and e-
ciency in locating return path ingress. Field technicians can view the return
spectrum as received by the JDSU PathTrak Return Path Monitoring System. The
DSAM allows for comparison of the remote spectrum with the local spectrum.
Return Alignment
With a DSAM-6300 maintenance technicians can see actual received
levels at the SDA-5500 or SDA-5510, providing a simple one-man
solution for return alignment. This capability is useful for validating
the ber node return alignment or gain as well as determining overall
system loss.
Return Loopback
Return loopback provides technicians with a quick closed-loop system,
in which the DSAM transmits a signal on the output port and receives
and measures it on the input port. Technicians can use this capability to
check and pre-set the gain on a return amplier or to validate the loss
or performance of a passive device.
Headend Sweep Equipment
With the DSAM-6300, one person can perform forward (downstream)
and reverse (upstream) path alignment simultaneously. For reverse
testing with more than one eld technician, the rack-mounted Model
SDA-5510 Headend Reverse Sweep Manager can perform reverse
sweep on the same cluster of nodes for up to 10 dierent technicians.
The SDA-5500 transceiver used in conjunction with the SDA-5510
receiver provides a full forward and reverse sweep alignment solution.
The SDA-5510 can also stand alone in remote hub sites for dedicated
reverse alignment applications.
Forward combiner
Out
SDA-5500
SDA-5510
Out In
In
Splitter
Distribution Plant
Optical
transmitter
Optical
transmitter
Optical
transmitter
Reverse combiner
Optical
transmitter
Node
Node
Node
Optical
transmitter
Optical
transmitter
Forward Sweep
Meter receives sweep pulses and
reference levels transmitted
from headend or hub site and
displays dierence levels (delta).
Return Sweep
Meter generated sweep pulses transmitted from
eld and received in headend or hub site.
Return Sweep
Headend or hub site transmits received sweep pulse levels back
to originating eld meter for display of dierence levels (delta).
(10 Seiten)
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