78P2352 Dual Channel OC-3/STM1-E/E4 Line Interface Unit
ELECTRICAL SPECIFICATIONS (continued)
TRANSMITTER SPECIFICATIONS FOR CMI INTERFACE
Bit Rate: 139.264Mbit/s 15ppm or 155.52Mbits/s 20ppm
Code: Coded Mark Inversion (CMI)
Relevant Specification: ITU-T G.703
With the coaxial output port driving a 75Ω load, the output pulses conform to the templates in Figures 10, 11,
12, and 13. These specifications are tested during production test.
PARAMETER
Peak-to-peak Output Voltage
Rise/ Fall Time
CONDITION
Template, steady state
10-90%
MIN
0.9
NOM
MAX
1.1
2
UNIT
V
ns
Negative Transitions
-0.1
-0.5
0.1
Positive Transitions at Interval
0.5
Transition Timing Tolerance
ns
Boundaries
Positive Transitions at mid-
interval
-0.35
0
0.35
0
Transmit clock frequency stability
(PIxCK or SIxCKP/N )
With respect to CKREF
ppm
The following specifications are not tested during production test. They are included for information only.
Note that the return loss depends on the board layout and the particular transformer used.
PARAMETER
CONDITION
MIN
NOM
MAX
UNIT
Output Impedance
Driver is open drain
1
8
MΩ
pF
Return Loss
7MHz to 240MHz
15
dB
27
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
