78P2352 Dual Channel OC-3/STM1-E/E4 Line Interface Unit
ELECTRICAL SPECIFICATIONS (continued)
RECEIVER SPECIFICATIONS FOR CMI INTERFACE (Transformer-coupled)
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
CMI mode; MON=0;
12.7dB of cable loss
Peak Differential Input
70
550
mVpk
Amplitude, RXxP and RXxN
CMI mode; MON=1;
Peak Differential Input
25
-2
80
6
mVpk
dB
Amplitude, RXxP and RXxN
20dB flat loss w/ 6dB of cable loss
CMI mode; MON=0;
All valid cable lengths.
Flat-loss Tolerance
STM-1 mode; CMI mode;
12.7 dB cable loss
a) Normal receive mode
b) Remote loopback mode
Receive Clock Jitter
0.1
0.07
UIpp
UIpp
Latency
PLL Lock Time
Return Loss
5
1
10
10
UI
µs
dB
7MHz to 240MHz
15
The input signal is assumed compliant with ITU-T G.703 and can be attenuated by the dispersive loss of a
cable. The minimum cable loss is 0dB and the maximum is –12dB at 70MHz.
The “Worst Case” line corresponds to the ITU-T G.703 recommendation. The “Typical” line corresponds to a
typical installation referred to in ANSI T1.102-1993. The receiver is tested using the cable model. It is a lumped
element approximation of the “Worst Case” line.
30
25
20
15
10
5
0
1.00E+05
1.00E+06
1.00E+07
1.00E+08
1.00E+09
Frequency (Hz)
Worst Case
Typical
Figure 14: Typical and worst-case Cable attenuation
33
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