CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 37

• Manufacturer Part Number: CN8380EPF
• Description: integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications
• Manufacturer: CONEXANT [Conexant Systems, Inc]

CN8380
Quad T1/E1 Line Interface
N8380DSA
ratio is required if parallel termination (Rt) or series resistors (Rs) are desired.
The alternate transformer has a turns ratio of 1:1.36. This transformer can be used
only if all of the following are true:
reduced by approximately 30%, compared to the unterminated, standard
transformer configuration.
sometimes used with surge protection circuits. Without compensation, the
addition of these resistors decreases the transmit pulse amplitude. The CN8380
provides an option in Host Mode to boost the output level if resistors are installed.
Compensation is optimized for the use of 5.6
these resistors are required.
Figure 2-7. Transmit Termination Components
and CN8380 configuration information for all termination options supported. The
resulting return loss value is also listed. All five options are supported in Host
Mode, whereas only options C and D are supported in Hardware Mode.
Configurations, to select an application mode. Then refer to the Transmit
Termination tables below to select a termination option.
8380_012
The standard transformer recommended has a turns ratio of 1:2. This turns
• Parallel termination (Rt) is not used.
• Series resistors (Rs) are not used.
• T1 DSX-1 transmit pulse is not used.
Refer to Option E in
Resistors (Rs) in series with Tx TIP and Tx RING line connections are
Tables 2-4
Before selecting a termination option, refer to
CN8380
through
Advance Information
XRING
XTIP
Conexant
2-8
Table 2-7
provide recommended termination component values
Ct
below. Transmitter power consumption is
Rt
Rs values. In Hardware Mode,
Transformer
Table 2-3, Transmit Pulse
1:N
2.0 Circuit Description
Rs
Rs
2.4 Transmitter
Tx RING
Tx TIP
2-15