Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 98)

DIU/DIM Details
7-18 Verilink
Figure 7-20 Drop-and-Insert LOF/RAI Processing (Detection from Equipment)
When the CSU detects an LOF from the equipment, the DIUs
perform channel conditioning operations on the associated data
equipment. Each DIU negates the CTS, DSR, and DCD handshaking
signals to the associated customer data equipment (if not
configured by the user to permanently assert these signals). It also
sends all-ones idle bytes to the data equipment.
In the opposite direction, the CSU sends channels 1 through 12 of
the incoming network signal to the equipment. It also continues
inserting data from the DIUs into channels 13 through 24, and
sends this data to the equipment.
NOTE: In LOF and RAI processing with DIUs, if the CSU is
programmed for SF framing, it neither generates nor
responds to a received RAI. Therefore, channel conditioning
will not occur at the far-end CSU and DIUs.
Drop DIU data
DS-1
CHAN
BANK
DATA
EQPT
INSERT
DROP
CSU
NETWORK
DIUs
DROP-AND-INSERT TOWARD NETWORK
ALL ONEs (ch. 1 - 12) +
Insert DIU data (ch. 13 - 24)
NET VF (ch. 1 - 12) +
ALL ONEs (ch. 13 -
24) + RAI*
(LOF)
(ch. 13 - 24)
*RAI is sent to equipment if
CSU detects LOS from
equipment.
(VF on
ch. 1 - 12)