Rainbow Electronics DS21458 - Manual (Page 189)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
189 of 270
Register Name:
BIC
Register Description: BERT Interface Control Register
Register Address: EAh
Bit
# 7 6 5 4 3 2 1 0
Name — RFUS — TBAT TFUS — BERTDIR BERTEN
Default 0 0 0 0 0 0 0 0
Bit 0/BERT Enable (BERTEN).
0 = BERT disabled
1 = BERT enabled
Bit 1/BERT Direction (BERTDIR).
0 = network: BERT transmits toward the network (TTIP and TRING) and receives from the network (RTIP and
RRING). The BERT pattern can be looped back to the receiver internally by using the Framer Loopback function.
1 = system: BERT transmits toward the system backplane (RSER) and receives from the system backplane (TSER)
Bit 2/Unused, must be set to zero for proper operation.
Bit 3/Transmit Framed/Unframed Select (TFUS). For T1 mode only.
0 = BERT will not source data into the F-bit position (framed)
1 = BERT will source data into the F-bit position (unframed)
Bit 4/Transmit Byte Align Toggle (TBAT). A zero-to-one transition will force the BERT to byte align its pattern with the
transmit formatter. This bit must be transitioned in order to byte-align the Daly Pattern.
Bit 5/Unused, must be set to zero for proper operation.
Bit 6/Receive Framed/Unframed Select (RFUS). For T1 mode only.
0 = BERT will not sample data from the F-bit position (framed)
1 = BERT will sample data from the F-bit position (unframed)
Bit 7/Unused, must be set to zero for proper operation.