Power Parameters Info

Power Parameters Info

Last updated: November 10, 2006

This section is only applicable to the lab application and to a test application with the required feature license.

The Power Parameters Info menu allows you to specify a set of T2P (Traffic To Pilot) parameters for each reverse data packet size and transmission mode. When the current physical layer subtype is subtype 2 (see Release A Physical Layer Subtype ), the T2P parameters used with other settings (such as R-Data transmission mode, R-Data packet size) to determine the current TxT2P gain (R-Data Channel gain relative to R-Pilot Channel) and current RRI Channel gain for the subpacket being transmitted.

In Active Cell operating mode the T2P parameters are negotiated with the AT during Session Negotiate State . They are configured via one of several complex configurable attributes of the Subtype 3 Reverse Traffic Channel MAC Protocol. When a session is open, changing these settings will result in a session re-negotiation. When a connection is open, changing these settings will result in the connection closed. You will have to re-open the connection. To determine when the Subtype 3 Reverse Traffic Channel MAC Protocol is active, see Current Physical Layer Subtype and Associated Protocols . Each complex configurable attribute is called PowerParameters PS attribute, where PS represents each supported data packet size. The complex attributes group all of the T2P parameters for a given data packet size together.

With the T2P Setup Ctrl setting (only used for front panel operation), you can specify a reverse data packet size that a set of T2P parameters are to be set for. (Note that changing the R-Data Pkt Size in RETAP configuration will also result in the T2P Setup Ctrl setting changed to the same value.) The T2P parameters for each reverse data packet size and transmission mode can be classified into three categories:

T2P Transition Settings

The T2P Transition settings determine which TxT2P gain and RRI Channel Gain parameters are used for a subpacket transmitted at a given configuration (packet size and transmission mode). The T2P Transition values are set to one less than the number of subpackets that will use the Pre-Transition gain value. Subpackets after the T2P Transition value will use the Post-Transition gain value. See Determination of TxT2P Pre-Transition and Post-Transition Gain and RRI Channel Gain Parameters for details.

The T2P Transition values can be uniquely set for each data packet size and transmission mode. The <n-bit> <mode> T2P Transition settings corresponds to the Mode T2PTransition PS attribute as defined in the C.S0024-A standard, where Mode represents high capacity and low latency transmission modes and PS represents Packet Size (which can be 128, 256, 512, 768, 1024, 1536, 2048, 3072, 4096, 6144, 8192 or 12288 bits).

The current T2P Transition value indicates the T2P Transition value for the current configuration of data packet size and transmission mode. The current data packet size is determined by R-Data Pkt Size and the current transmission mode is determined by Reverse Data Transmission Mode .

The current T2P Transition value is used to control the current R-Data Channel Gain (TxT2P) and current RRI Channel Gain. See Determination of TxT2P Pre-Transition and Post-Transition Gain and RRI Channel Gain Parameters .

Termination Target Settings

The Termination Target settings are used to determine the target number of subpackets required to successfully transmit a physical traffic packet at a given configuration (packet size and transmission mode). The Termination Target values are set to one less than the number of subpackets needed to achieve the target Physical Layer erasure rate of the traffic packet in that configuration.

The Termination Target values can be uniquely set for each data packet size and transmission mode. The <n-bit> <mode> Termination Target setting corresponds to Mode TerminationTarget PS attribute as defined in the C.S0024-A standard, where Mode represents high capacity and low latency transmission modes and PS represents Packet Size (which can be 128, 256, 512, 768, 1024, 1536, 2048, 3072, 4096, 6144, 8192 or 12288 bits).

The current Termination Target value indicates the Termination Target value for the current configuration of data packet size and transmission mode. The current data packet size is determined by R-Data Pkt Size and the current transmission mode is determined by Reverse Data Transmission Mode .

The current Termination Target value does not directly affect the R-Data Channel Gain (TxT2P) and R-RRI Channel Gain.

TxT2P Gain Settings

The TxT2P gain settings determine the R-Data Channel gain relative to the R-Pilot Channel for each data packet size and transmission mode. Whether the TxT2P Pre-Transition or Post-Transition gain is used for a particular subpacket at the given configuration depends on the current T2P Transition Settings value, as shown below.

Determination of TxT2P Pre-Transition and Post-Transition Gain

Current T2P Transition Value

<n-bit><mode>TxT2P Pre-Transition and Post-Transition Gain (dB)

Subpacket 0

Subpacket 1

Subpacket 2

Subpacket 3

0

TxT2P Pre-Transition

TxT2P Post-Transition

TxT2P Post-Transition

TxT2P Post-Transition

1

TxT2P Pre-Transition

TxT2P Pre-Transition

TxT2P Post-Transition

TxT2P Post-Transition

2

TxT2P Pre-Transition

TxT2P Pre-Transition

TxT2P Pre-Transition

TxT2P Post-Transition

3

TxT2P Pre-Transition

TxT2P Pre-Transition

TxT2P Pre-Transition

TxT2P Pre-Transition

The <n-bit> <mode> TxT2P Pre-Transition and Post-Transition settings corresponds to TxT2P Mode PreTransition PS and TxT2P Mode PostTransition PS attribute as defined in the C.S0024-A standard, where Mode represents high capacity and low latency transmission modes and PS represents Packet Size (which can be 128, 256, 512, 768, 1024, 1536, 2048, 3072, 4096, 6144, 8192 or 12288 bits).

Current TxT2P Pre-Transition and Post-Transition gain values indicate the TxT2P gain used for the current configuration of data packet size and transmission mode. The current data packet size is determined by R-Data Pkt Size and the current transmission mode is determined by Reverse Data Transmission Mode .

The power level of the R-Data channel is determined by the current TxT2P gain values (see Expected Power ).

Power Parameters Screen

All of the T2P parameters for each data packet size and transmission mode are displayed on the Power Parameters screen. Which set of T2P parameters being applied in the test set (current values) is identified by a '>' indicator as shown below.

Power Parameters Screen

Related Topics


GPIB Command: CALL:MS:T2Pilot commands (see CALL:MS )

Manual Operation: How Do I Change Channel Gain/Traffic Info Parameters? (Power Parameters Info menu)

R-Data Pkt Size



Expected Power

Reverse Channel Overview