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| 1.3 System Components |
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| ITEM |
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| OPTION BOARD |
| DESCRIPTION |
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| KSU |
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| Key Service Unit |
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| PSU |
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| Power Supply Unit, 90W |
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| Main |
| MBUB |
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| Main Board Unit (2BRI, 4DKT, 2DKT/SLT, and 2SLT) |
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| CO boards |
| Central Office Line interface boards (LCOB, STIB,CBIB) |
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| EXT boards |
| Extension boards (DTIB, SLIB) |
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| LCOB |
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| Loop Start CO Interface, 4 lines |
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| PRU4 |
| Polarity Reversal detection Unit |
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| PRCPTU4 |
| Polarity Reversal & Call Progress Tone detection Unit |
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| CPCU4 |
| Call Progress | Tone | |
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| detection Unit |
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| CO Line |
| CBIB |
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| Loop Start CO Interface, 2 lines |
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| Boards |
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| Basic Rate(Only T) Interface Board, 1 line (2 channels) |
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| PRU2 |
| Polarity Reversal detection Unit |
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| PRCPTU2 |
| Polarity Reversal & Call Progress Tone detection Unit |
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| CPCU2 |
| Call Progress | Tone | |
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| detection Unit |
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| STIB |
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| ISDN Basic Rate (S/T) Interface Board, 2 lines (4channels) |
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| DTIB4 |
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| Digital Terminal Interface Board, 4 ports |
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| Extension |
| DTIB8 |
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| Digital Terminal Interface Board, 8 ports |
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| Boards |
| SLIB4 |
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| SLT Interface (+36V Feed) Board, 4ports |
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| SLIB8 |
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| SLT Interface (+36V Feed) Board, 8ports |
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| VMIBE |
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| Enhanced Voice Mail Interface Board, 4 channels |
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| Other |
| AAFBE |
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| Enhanced Auto Attendant Function Board, 3 channels |
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| Boards |
| LANU |
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| LAN interface Unit |
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| MODU |
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| MODEM unit (33Kbps) |
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| VOIM |
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| Voice over Internet protocol interface module (4 channels) |
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| Expansion |
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| VOIU |
| Voice over Internet protocol interface unit.(4 channels) |
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| Modules |
| SLIM |
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| SLT Interface (+36V Feed) module, 8ports |
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| DTIM |
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| Digital Terminal Interface module, 8 ports |
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