BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 105

• 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
2.9.3 Line Build Out
N8370DSE
2.9.2.2 Output Jitter
The maximum output jitter generated on XTIP/XRING dependents on the
transmit clock source selected. Refer to CLAD and JAT descriptions.
In the Bt8370 long haul device, three LBO filter networks can be enabled in the
TLIU to attenuate XTIP/XRING outputs in 7.5 dB steps, per the signal transfer
function defined by FCC Part 68 Regulations. (See LBO[1:0] in TLIU_CR.) The
number of LBO filters selected is based on the attached cable length. For short
line lengths, larger LBO attenuation prevents far-end crosstalk. For longer line
lengths, the appropriate line build-out must be selected. The following equation
lists the transfer function for each of the 7.5 dB LBO filters:
where:
Conexant
V
--------- -
V
out
in
=
f
d
n
n
d
n
d
3
1
2
0
=
-------------------------------------------------------- -
d
0
2
=
3
=
=
=
d
=
frequency Hz
=
S
1
S
3.8307
n
3
7.9861
9.2404
2.1612
1.6049
4.575
=
2
+
=
S
1.7223
2
d
j2 f
2
+
S
n
2
10
10
1
10
10
10
+
10
S
7 –
–
d
1 –
8 –
+6
6
14
+
1
S
n
0
+
2.9 Transmit Line Interface Unit
d
0
2.0 Circuit Description
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