Measurement request counter. This counter is incremented by one every time a request for a bits-per-subcarrier measurement is made. A measurement request

is made by modifying the xdsl2LineCmndConfBpsc object from idle(1) to the value measure(2).

The measurement results may be very large and will not fit into a single PDU; hence, multiple SNMP GET requests may be required to fetch the measurement results. Because the measurement results cannot be fetched atomically, it is possible for a second manager to start a new measurement before a first manager has fetched all of its results. An SNMP manager can use this object to ensure that the measurement results retrieved using one or more GET requests all belong to the measurement initiated by that manager.

The following steps are suggested in order for the SNMP manager to initiate the bits-per-subcarrier measurement:

1. Wait for xdsl2LineCmndConfBpsc value to be idle(1). 2. Perform an SNMP GET for xdsl2LineCmndConfBpscRequests. 3. Wait a short delay (4 -> 8 seconds). 4. Perform an SNMP SET on xdsl2LineCmndConfBpsc with the value measure(2). 5. If step 4 returns an error, then go to step 1. 6. Wait for xdsl2LineCmndConfBpsc value to be idle(1). 7. Fetch measurement results using one or more GET PDUs. 8. Perform an SNMP GET for xdsl2LineCmndConfBpscRequests. 9. Compute the difference between the two values of xdsl2LineCmndConfBpscRequests. If the value is one, then the results are valid, else go to step 1.