
DS3181/DS3182/DS3183/DS3184
41
7.4 UNI Line Interface—OHM Mode
The line interface is forced into UNI mode when the framer is in any OHM mode; therefore, the LM bits are Don’t
Cares. This mode is the same as the UNI Line Interface Mode except that the OHM pins determine whether the
data is payload or not.
Table 7-4. UNI Line Interface—OHM Mode Configuration Registers
MODE
FM[5:0]
LM[2:0]
AND
TLEN
DS3/E3 Overhead
Mask Mode
0XXX01
XXX
X
1
Clear-Channel
Overhead Mask Mode
1XX0X1
XXX
X
1
Figure 7-4. UNI Line Interface—OHM Mode
TDATn
TOHMOn
TLCLKn
n = port #
Li
ne
Lo
op
ba
ck
Frame
rD
iag
no
st
ic
Lo
op
ba
ck
TUA1
Clock Rate
Adapter
CL
KA
CL
KB
CL
K
C
RLCLKn
RDATn
ROHMIn
FROM FRAMING LOGIC
OR EXTERNAL PINS
TO FRAMING LOGIC
OR EXTERNAL PINS
TOHMIn
AL
B