The Brandywine Communications IBU-240 is a dual input to 24 output low frequency distribution amplifier specifically designed for distributing IRIG A and B modulated formats (including IEEE 1344 extensions) in a 1U 19” rack mount chassis. Each of the 24 outputs is transformer coupled and a faithful reproduction of the time code input. Typical input/output levels are 4 VPP with an output impedance of 600 ohms
A three-position front panel switch chooses automatic operation or may be used to manually select one of the two input sources. When the AUTO mode is selected the AUTO indicator will be illuminated and Input A will be used if it is available. Should Input A fail Input B will be chosen automatically. Indicators show the status of the inputs and which input has been selected.
Each of the twenty-four outputs is monitored for failure either internally or externally. Should one of the outputs fail, a group alarm Fault indicator will illuminate on the front panel. Rear panel input Fault Discrete signals allow external equipment to force the outputs to be derived from either input source in case of a source failure.
| Time Code Inputs | |
| Connector | Two rear panel BNC's |
| Amplitude | 4 Vrpp |
| Input Impedance | 600 Ohms, transformer isolated |
| Frequency | 300Hz to 50kHz |
| Fault Discrete Input | |
| Number of Inputs | 2 |
| Connector | DB9 |
| Level | TTL |
| Active Level | Link selectable, high or low |
| Time Code Outputs | |
| Number of Outputs | 24 |
| Connector | BNC |
| Amplitude | Same as input |
| Isolation | Transformer coupled |
| Output Impedance | 600 Ohms |
| Output Protection | Short-circuit proof |
| Fault Sense & Transfer | |
| Modes | Automatic and Manual |
| Manual | Selects input A or Input B |
| Auto | Provides automatic switch from A to B should input A fail |
| Environmental/Physical | |
| Temperature | 0 to +50°C |
| Storage | -40 to +85°C |
| Humidity | To 95% non-condensing |
| Power | 115/230 Vac 50/50 Hz, <25W |
| Optional Power | 18-36 Vdc, 36-72 Vdc, -48 Vdc |
| Dimensions | 19" W x 1.73 (1U) H x 14.5" D |
| Weight | 7.5lb typical |
| EMC Emission | to EN50081-1 as EN55022 |
| EMC Immunity | To EN50082-1 as EN1000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst |
 IBU-240 | Data Sheet |
| IBU-240 | User Manual |
