Setup Button Selections

Rx Input: The Primary and Secondary inputs are both affected by this setting.
 - Terminate - Sets the input impedance to 100 Ohms. Can be performed only when the T1 circuit is interrupted (connected into a jack that interrupts the circuit).
 - Monitor - Sets the input impedance to 100 Ohms, inserts 20 dB gain, and should be selected when connected to a 'Monitor' jack.
 - Bridge - Sets the input impedance >1000 Ohms and should be selected when bridging on to a T1 circuit.
 Line Code: Configures the test set to transmit and expect to receive a line code that is compatible with the network's design. There are two types of line coding used in T1 networks:
 - AMI - Alternate Mark Inversion is a traditional line code.
- B8ZS - Bipolar 8 Zero Substitution replaces runs of 8 zeroes with a special code that is not compatible with AMI. It allows greater flexibility of data patterns by enhancing repeater synchronization by increasing pulse density, thereby providing greater throughput.
 Framing: Configures the test set to transmit and expect to receive a particular framing pattern that is compatible with the network's design. It enables the test set to receive the T1 signal and to then synchronize, identify, and extract the individual channels.
 - Unframed - The 193rd (framing) bit is set to 0 or 1, depending on the pattern.
 - D3/D4 - A 12 frame structure accomplished by sending a unique pattern on the 193rd (framing) bit.
 - ESF - A 24 frame structure accomplished by sending a unique pattern on the 193rd (framing) bit. In this mode the frame bits are used to transmit a CRC and carry information to accommodate alarms and control
 Pattern: Configures the test set to expect a particular test pattern. Many test patterns are available to 'stress' the circuit in a particular manner or to gain maximum insight into a particular problem.
 Tx Pattern: Allows you to select either Normal or Inverted patterns.
Tx Clock: Configures the test set to use one of the following methods to derive the transmit clock frequency:
 - Internal - The transmit clock is derived within the test set and is independent of the incoming signal. This is useful when the device or line under test is configured to synchronize on the incoming signal. In this case the return clock frequency of the return signal should match the transmit clock frequency of the test set.
 - Primary Rx - The transmit clock frequency is derived from the signal received at the Primary Rx jack on the test set.
 - Secondary Rx - The transmit clock frequency is derived from the signal received at the Secondary Rx jack on the test set.
 Channel: Applicable only in the Channel BERT mode. Sets the active channel to be tested for BERT.
 Fill Data: When performing Channel BERT testing this configures the source of data transmitted in the unused slots. For drop-and-insert testing this field is typically set to Secondary Rx.
 - All 1's - Set this mode to maintain a sufficient 1s density on the unused channels during testing. All 1s are typically transmitted on unused channels in live T1 circuits.
 - Idle - Set this mode to accommodate specific troubleshooting such as to exercise a circuit designed for B8ZS.
 - Primary Rx - Fills the unused slots with Primary Rx data.
 - Secondary Rx - Fills the unused slots with Secondary Rx data.
 Loop Code: Selects the format of the transmitted code when a loop-up or loop-down is requested.
- ESF Datalink - Loopback state change requests are sent to the far end in the framing pattern in the ESF datalink channel. Note that this mode is possible when only ESF is selected for the framing pattern.
 - In-band - Loopback state change requests are sent to the far end by replacing the normal channel data with the loop code. Note that in this mode the code must persist for 5 seconds for the far end to respond
 Slip Reference: Selects the reference for the frame slip measurement.
 - None - This selection disables the frame slip measurement.
 - Internal - In this mode the test set compares the framing of the incoming signal with the test set's internal clock. Three conditions are necessary when using this mode: the far end must be receiving a signal from this test set, the transmit clock on the far end must be configured to synchronize on the incoming signal, and the Tx Clock on this test set must be set to Internal.
 - Second Rx - In this mode the test set compares the frame clock timing of the received signal on the Primary Rx jack with the frame clock timing of the received signal on the Secondary Rx jack.
 Tx Line Build Out [Tx LBO]: Sets the Tx level and pulse shape to simulate the signal conditions that would be encountered at the end of a distant transmission cable. This is useful for testing equipment suspected of having trouble receiving the signals found in typical applications.
 Second Tx: Selects the source of data of the signal available at the Secondary Tx jack.