BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 183

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Table 3-14. Return Loss Values
LBO[1:0]
N8370DSE
TURNS
0
0
0
1
0
0
0
1
0
0
0
1
Select Line Build Out—Up to three LBO networks can be placed in line with the transmitter to
attenuate XTIP/XRING outputs in 7.5 dB steps, per the signal transfer function defined by
FCC Part 68 regulations. (Refer to
templates, which are applicable only while PULSE[2:0] = 111).
TERM
0
1
1
0
0
1
1
0
0
1
1
0
R
None
None
None
None
None
None
51.1
40.5
51.1
54.1
51.1
64.9
TERM
LBO
00
01
10
11
Pulse[2:0] = 100
Pulse[2:0] = 120
Pulse[2:0] = 75
R
Attenuation @ 772 kHz
L
–18
–65
–32
–76
–18
–74
Conexant
(dB)
0
0
0
0
0
0
Figure 2-41
15.0 dB
22.5 dB
0.0 dB
7.5 dB
Cable Selection
Cable Selection
Cable Selection
(Normalized)
through
1.00
1.00
0.89
1.00
1.00
1.00
1.03
1.00
1.00
1.00
1.13
1.00
V
PK
Figure 2-44
Final Span Target Loss
Iout scaled for 1:1.36
Compromise match
Impedance match
Iout scaled for 1:1.15
Iout scaled for 1:1.36
Compromise match
Impedance match
Iout scaled for 1:1.15
Iout scaled for 1:1.36
Compromise match
Impedance match
Iout scaled for 1:1.15
FCC Option
Option A
Option B
Option C
for LBO isolated pulse
3.11 Transmit LIU Registers
Remarks
3-65