DS2148 Dallas Semiconducotr, DS2148 Datasheet - Page 49

• Manufacturer Part Number: DS2148
• Description: 5V E1/T1/J1 Line Interface
• Manufacturer: Dallas Semiconducotr

9.4
The DS2148 is capable of receiving a 2.048MHz square-wave synchronization clock as specified in
section 13 of ITU G.703 (10/98). To use the DS2148 in this mode, set the receive synchronization clock
enable (CCR5.3) = 1. The DS2148 can also transmit the 2.048MHz square-wave synchronization clock as
specified in Section 10 of G.703. To transmit the 2.048MHz clock, set the transmit synchronization clock
enable (CCR5.2) = 1.
LINE BUILD OUT SELECT FOR E1 IN REGISTER CCR4 (ETS = 0) Table 9-1
Note: See Figure 9-1, Figure 9-2, and Figure 9-3.
LINE BUILD OUT SELECT FOR T1 IN REGISTER CCR4 (ETS = 1) Table 9-2
Note: See Figure 9-1, Figure 9-2, and Figure 9-3.
L2
0
0
1
1
L2
0
0
0
0
1
1
1
1
G.703 Synchronization Signal
L1
0
0
0
0
L1
0
0
1
1
0
0
1
1
L0
0
1
0
1
L0
0
1
0
1
0
1
0
1
V
5V
5V
5V
5V
DD
V
5V
5V
5V
5V
5V
5V
5V
5V
DD
75W normal
120W normal
75W w/ high return loss
120W w/ high return loss
DSX-1 (0 to 133 feet) /
DSX-1 (133 to 266 feet)
DSX-1 (266 to 399 feet)
DSX-1 (399 to 533 feet)
DSX-1 (533 to 655 feet)
-7.5dB CSU
-15dB CSU
-22.5dB CSU
APPLICATION
APPLICATION
0 DB CSU
49 of 75
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
N
N
RETURN LOSS
RETURN LOSS
21 dB
21 dB
NM
NM
NM
NM
NM
NM
NM
NM
NM
NM
18W
27W
0W
0W
0W
0W
0W
0W
0W
0W
0W
0W
Rt
Rt