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MDS Orbit MCR/ECR Technical Manual
MDS 05-6632A01, Rev. F
LED - NIC2
State
Description
LnRadio Interface
Off
Interface disabled
Access Point Mode
Blink Red
Solid Red
Solid Green
NIC Initialization
No Remotes connected
Linked with at least 1 Remote
Remote Mode
Blink Red
Solid Green
NIC Initialization / Not linked to an Access Point
Linked with Access Point
Important Notes and Information Regarding EVM
EVM (error vector magnitude) is dependent on the modulation format and should be used as a relative
measurement of the link quality. A low EVM value indicates a better link quality than a high value.
Algorithmically, using QAM modulation, the transceiver calculates the value by measuring the sample
points of each "bit" and comparing it with the expected constellation based on the modem type.
-
EVM is a metric of the quality of the received signal. It is a dynamic value that is computed
only when data is received on the RF interface, and should be refreshed accordingly.
-
Unlike RSSI which simply measures signal strength, EVM is a measurement of the
"correctness" of this signal. (This means how easily the received signal can be correctly
demodulated.)
-
In general the lower the EVM the better the quality. A strong link will typically show an EVM
below 5.
Adaptive Modulation
The adaptive modulation mode (modulation automatic) allows directed traffic to adjust which modem is
used on a per-transmission basis. Adaptive modulation works in both upstream and downstream mode.
The mode selection varies between QPSK, 16QAM, and 64QAM. A signal metric score is used to decide
which modem selection to use. The score is determined based on signal strength and packets received.
Advanced configuration can be used to provide some control over the adaptive modulation thresholds.
The primary use case for this feature is if an AP has some remotes that are close to the AP and could
support a higher data rate and some farther away (or obstructed) that can only support a lower data rate.
This mode allows the close remotes to take advantage of the higher data rate for the directed messages,
when otherwise the whole network would have had to be run at the lower data rate. Note that broadcast
or multicast data must always be transmitted at the lowest rate.
We recommend keeping adaptive modulation set for most installations.
Security
Setting the security mode to EAP or PSK will enable device authentication. When enabled, the remotes
will authenticate with the AP (PSK) or a backend RADIUS server (EAP) before they are allowed to pass
data on the network. The authentication protocol is compliant with IEEE 802.1X. If device
authentication is enabled, over the air data encryption can also be enabled. This ensures all over the air
traffic is protected. When encryption is enabled, the device must occasionally rotate the encryption keys.
This rotation is logged in the event log with event type nx_auth. These events can be suppressed in the
event log configuration to prevent them from filling the event log. See section 3.6.2 for instruction on
controlling the event log.
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