PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Table 12
- Recommended Rx Network Values
SignalType
Turns ratio
(N ± 5%)
Squelch level on
the primary
R1 (Ω ± 1%) R2 (Ω ± 1%)
G.703
1:2
1:2
357
205
121
276 mV ± 20%
220 mV ± 20%
Zo = 120Ω
Zo = 75Ω
95.3
Tight tolerances are required on the resistors and turns ratio to meet the return
loss specification.
14.7 Alternative Longitudinally Balanced Receive Interface
Although there is no specification that the E1 termination must be longitudinally
balanced, it is sometimes preferable to have it so (e.g. if using controlled
impedance PCB traces for connecting the line interface transformer to the
PM6341 E1XC).
Therefore, for designs where longitudinal balance is preferred, the following
receive line interface (shown in Figure 31) can be used.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
215
PMC [ PMC-SIERRA, INC ]
