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Chapter 3 Indoor Equipment Maintenance
Redline Communications Inc. Confidential and Proprietary
Working with Service Classes, Service Flows and Classifiers
The MAC layer at the sector controller is responsible for allocating bandwidth to all users,
in both the uplink and the downlink. For the downlink, the sector controller can allocate
bandwidth to each subscriber unit, based on the needs of the incoming traffic, without
involving the subscriber unit. For the uplink, allocations are based on requests from the
subscriber unit.
The 802.16 MAC describes a number of Convergence Sub-layers (CS) which describe
how wireline technologies such as Ethernet, ATM and IP are encapsulated for transport
over the air interface, and how data is classified, etc.
Service Classes allow you to define the parameters of various service flows in order to
create a template that can be easily re-used when provisioning new subscriber units. The
service class is implemented at the sector controller and is associated with services flows
that will deliver data at the specified QoS.
Service Flows are a MAC transport service that provides uni-directional transport to uplink
packets sent from the subscriber unit to the sector controller or downlink packets from the
sector controller to the subscriber unit. A service flow is characterized by a set of QoS
parameters, including details of the subscriber unit requests for uplink bandwidth
allocations and the expected behaviour of the sector controller uplink scheduler.
Each service flow is specified by classifiers that are interpreted by the sector controller.
Classifiers defines how upstream flows are scheduled.
Service flows provide the ability to set up multiple uplink and downlink connections from
the sector controller to each subscriber unit. Each service flow may be assigned a
classifier that provides a unique service level category and QoS settings. A service flow is
not fully activated until at least one classifier is assigned to the service flow.
Typically you will define one or more uplink and downlink service flows for type of service
you are offering. You will then assign these service flows to subscriber units as they are
provisioned. When creating and assigning your service flows, you must keep in mind,
maximum number of both service flows and classifiers that are supported for each sector
controller.
Antenna connection
Check all of the connections under the antenna for corrosion
or moisture damage. Replace any damaged connections and
weatherproof all connections as outlined in the RedMAX
Base Station Installation Guidelines
Obstruction of sky view
Remove any obstruction or move the antenna mast location
to allow for an un-obstructed view of the sky. Refer to the
Redline GPS Clock User Manual for details on antenna
placement.
Table 3-2
Troubleshooting Antenna Problems
Possible Cause
Investigative/Corrective Action
