Verilink DIU 2130 (880-503297-001) Product Manual User Manual

Page 96

DIU/DIM Details

7-16

Verilink

Figure 7-18 Data Equipment Timing (T1 Multiplexer Mode)

Figure 7-19 shows alarm processing when LOF is detected from the
network and CSU drop-and-insert is toward the network. The LOF-
detecting CSU sends all-ones on channels 1 through 12 toward the
DS1 channel bank for channel conditioning.

Figure 7-19 Drop-and-Insert LOF/RAI Processing (Detection from the Network)

NCC OR TAC

DATA BUS A OR B

TO/FROM
NETWORK

DATA
BUS C

XMT DATA

RCV DATA

DIU

2130

DATA

RCV CLOCK

XMT CLOCK

TRANSMIT

XMT TIMING (TT)

TO/FROM OTHER DIUs

CLOCK

RECEIVE
CLOCK

DS-1
CHAN
BANK

DATA
EQPT

INSERT

DROP

CSU

NETWORK

DIUs

Channel conditioning (negate CTS, DSR
and DCD; send ALL ONEs to data
equipment) (Note 2)

EQPT VF (ch. 1 - 12) +
Insert DIU data (ch. 13 -
24) + RAI

ALL ONEs (ch.
1 - 12)

(LOF)

CSU

DS-1
CHAN
BANK

DIUs

DATA
EQPT

INSERT

DROP

Channel conditioning (negate CTS and DSR,;
send ALL ONEs to data equipment)
(Note 2)

VF (ch. 1 - 12) +
ALL ONEs (ch.
13 - 24)

EQPT VF +
Insert DIU
data

(RAI)

(VF on
ch. 1 - 12)

(ch. 13 - 24)

NOTES:
1. In the SF mode, the CSU neither generates nor responds to a received Yellow Alarm. Therefore,
far-end channel conditioning does not occur with SF framing.

Drop and insert towrd Network