Setup Button Selections

Rx Input: The Primary and Secondary inputs are both affected by this setting.
 - Terminate - sets the input impedance to 75 Ohms. Can be performed only when the E1 circuit is interrupted (connected into a jack that interrupts the circuit).
 - Monitor - sets the input impedance to 75 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 an E1 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 E1 networks:
 - AMI - Alternate Mark Inversion is a traditional line code.
- HDB3 - High Density Bipolar 3 replaces runs of 4 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 E1 signal and to then synchronize, identify, and extract the individual channels.
 - Unframed - Causes the test set to simulate a loss of frame condition.
 - PCM31 +CRC4 - A framing format consisting of 30 traffic channels, 1 slot reserved for the frame alignment signal (FAS) with CRC
 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.
 Timeslot: 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 1's density on the unused channels during testing. All 1's are typically transmitted on unused channels in live E1 circuits.
 - Idle - Set this mode to accommodate specific troubleshooting such as to exercise a circuit designed for HDB3.
 - Primary Rx - Fills the unused slots with Primary Rx data.
 - Secondary Rx - Fills the unused slots with Secondary Rx data.
 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:
1. The far end must be receiving a signal from this test set.
2. The transmit clock on the far end must be configured to synchronize on the incoming signal.
 3. 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.
 Second Tx: Selects the source of data of the signal available at the Secondary Tx jack.
 - AIS - The signal at the Secondary Rx jack is an unframed all ones, and id often referred to as AIS.
- Second Rx - The Secondary Rx signal is buffered and looped back to the Secondary Tx jack.
 - Primary Rx - The signal at the Primary Rx jack is buffered and internally routed to the Secondary Tx jack.