XRT83L38 Datasheet, PDF (37/91 Pages) Exar Corporation – OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L38
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.0
TABLE 7: RECEIVE TERMINATIONS
RXTSEL TERSEL1 TERSEL0 RXRES1 RXRES0
R_ext
1
1
1
0
0
∞
R_int
120Ω
MODE
E1
1
0
0
0
1
240Ω
172Ω
T1
1
0
1
0
1
240Ω
204Ω
J1
1
1
0
0
1
240Ω
108Ω
E1
1
1
1
0
1
240Ω
240Ω
E1
1
0
0
1
0
210Ω
192Ω
T1
1
0
1
1
0
210Ω
232Ω
J1
1
1
0
1
0
210Ω
116Ω
E1
1
1
1
1
0
210Ω
280Ω
E1
1
0
0
1
1
150Ω
300Ω
T1
1
0
1
1
1
150Ω
412Ω
J1
1
1
0
1
1
150Ω
150Ω
E1
1
1
1
1
1
150Ω
600Ω
E1
Figure 14 is a simplified diagram for T1 (100Ω) in the external receive and transmit termination mode.
Figure 15 is a simplified diagram for E1 (75Ω) in the external receive and transmit termination mode.
FIGURE 14. SIMPLIFIED DIAGRAM FOR T1 IN THE EXTERNAL TERMINATION MODE (RXTSEL= 0)
XRT83L38 LIU
T T IP
3.1Ω
T R IN G
R T IP
3 .1 Ω
100Ω
R R IN G
1:2.45
1:1
100Ω
100Ω
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