CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 40

• 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]

2.0 Circuit Description
2.4 Transmitter
2-18
2.4.6.2 Output Disable
Option E
Option E uses the alternate 1:1.36 transformer, no series protection resistors (Rs),
and no parallel termination (Rt) for T1 applications. In E1 applications, Rt is
included because it is usually required to provide a minimal level of line
impedance matching. Option E is available only in Host Mode and cannot be used
with DSX-1 applications.
Table 2-8. Transmit Termination Option E
The transmitter analog outputs, XTIP[n] and XRING[n], are enabled per channel
by pulling the
high. In Host Mode, the PDN [TLIU_CR; addr n2] register bit also controls the
XTIP[n] and XRING[n] outputs. A device RESET sets the PDN bits, thereby
disabling XTIP[n] and XRING[n]. User software must clear PDN to enable the
transmitter outputs.
active (low). When
If the transmit driver is disabled (
(DPM) is available for monitoring a transmit signal from an external source.
Refer to
E1—75
E1—120
T1—I.431
NOTE(S):
1. Alternate transformer (1:1.36 turns ratio)
2. Hardware Mode: Not Applicable
3. Host Mode: ALT_TR = 1, TERM = 0, T_BOOST = 0 [TLIU_CR; addr n2]
Application
In Hardware Mode, the transmitter outputs are disabled while
Section 2.4.7.2, Driver Performance
XOE
Advance Information
Series Resistors
[n] pins low and are three-stated by pulling the
RESET
Conexant
None
None
None
(Rs)
is deactivated,
XOE
[n] = 1), the driver performance monitor
Parallel Termination
XOE
Monitor.
[n] controls the transmitter outputs.
(Rt,
107.0
None
68.1
)
Quad T1/E1 Line Interface
RESET
XOE
Return Loss
(dB)
N8380DSA
–10
–10
[n] pins
0
CN8380
is held