DS26401 datasheet(210/309 Pages) DALLAS

210 / 309 page

DS26401 Octal T1/E1/J1 Framer

210

10.18 Interfacing the E1 Rx Framer to the BERT

Data from the DS26401 receive framer can be ported to the on-chip BERT by using the registers described below.

Any single DS0 or combination of DS0s can be extracted from the data stream up to the entire T1 payload as

controlled by the RBCS registers.

Note that one BERT resource is shared between all 8 framers. Therefore, the RBEN bit should be set for only one

framer at a time. If multiple framers have the RBEN bit set, the lower number framer will be assigned the resource.

Details concerning the on-chip BERT can be found in Section 12.

RBICR

Receive BERT Interface Control Register

08Ah + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

—

RBDC

—

RBEN

Default

Bit 0 / Receive BERT Enable (RBEN)

0 = Receive BERT is not assigned to this framer

1 = Receive BERT is assigned to this framer

Bit 1 / Unused. Must be set = 0 for proper operation.

Bit 2 / Receive BERT Direction Control (RBDC)

0 = Receive Path: The BERT receives data from the network side via RPOS and RNEG.

1 = Backplane: The BERT receives data from the system backplane via the TSER pin.

Bits 2 to 7 / Unused. Must be set = 0 for proper operation.

DS26401 Datasheet(PDF) 210 Page - Dallas Semiconductor