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DS26401 Datasheet(PDF) 258 Page - Dallas Semiconductor |
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DS26401 Datasheet(HTML) 258 Page - Dallas Semiconductor |
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258 / 309 page  DS26401 Octal T1/E1/J1 Framer 258 11.20 Interfacing the E1 Transmitter to the BERT Data from the on-chip BERT can be ported to the transmit formatter by using the registers described below. Any single DS0 or combination of DS0s can be inserted into the data stream up to the entire T1 payload as controlled by the RBCS registers. Note that one BERT resource is shared among all 8 framers. Therefore the TBEN bit should be set for only one framer at a time. If multiple framers have the TBEN bit set, the lower number framer is assigned the resource. Details concerning the on-chip BERT can be found in Section 12. Register Name: TBICR Register Description: Transmit BERT Interface Control Register Register Address: 18Ah + (200h x n) : where n = 0 to 7, for Ports 1 to 8 Bit # 7 6 5 4 3 2 1 0 Name — — — — — TBDC — TBEN Default 0 0 0 0 0 0 0 0 Bit 0 / Transmit BERT Enable (TBEN) 0 = Transmit BERT is not assigned to this framer 1 = Transmit BERT is assigned to this framer Bits 1, 3 to 7 / Unused. Must be set = 0 for proper operation. Bit 2 / Transmit BERT Direction Control (TBDC) 0 = Transmit Path: The BERT transmits toward the network via the TPOS and TNEG pins. 1 = Backplane: The BERT transmits toward the system backplane via the RSER pin. |
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