Rainbow Electronics DS26504 - Manual (Page 93)

DS26504 T1/E1/J1/64KCC BITS Element
93 of 128
Figure 13-5. Protected Interface Using Internal Receive Termination
TTIP
TRING
RTIP
RRING
DV
DD
TV
DD
RV
DD
V
DD
V
DD
DV
SS
TV
SS
RV
SS
DS26504
68 mF
2:1
1:1
D1 D2
D3
D4
C1 F1
F2
F3
F4
S1
0.1 mF
0.1 mF
0.1 mF
0.01 mF
X1
X2
TRANSMIT
LINE
RECEIVE
LINE
0.1 mF
10 mF
10 mF
+
+
+
0.1 mF
S2
60 60
V
DD
D5 D6
D7
D8
0.1 mF
NOTES:
1) ALL RESISTOR VALUES ARE ±1%.
2) X1 AND X2 ARE VERY LOW DCR TRANSFORMERS
3) C1 = 10µF CERAMIC.
4) S1 AND S2 ARE 6V TRANSIENT SUPPRESSERS.
5) D1 TO D8 ARE SCHOTTKY DIODES.
6) THE FUSES, F1–F4, ARE OPTIONAL TO PREVENT AC POWER-LINE CROSSES
FROM COMPROMISING THE TRANSFORMERS.
7) THE 68 mF IS USED TO KEEP THE LOCAL POWER-PLANE POTENTIAL WITHIN
TOLERANCE DURING A SURGE.