cx28380 Mindspeed Technologies, cx28380 Datasheet - Page 34

• Manufacturer Part Number: cx28380
• Description: Cn8380 Quad T1/e1 Line Interface
• Manufacturer: Mindspeed Technologies

Table 2-6.
2.4.6.1.4
Option D uses the standard 1:2 transformer. A common parallel termination (Rt) for both T1 and E1 applications is
included to provide line impedance matching. Series protection resistors (Rs) are also included. Option D is
available in both Host Mode and Hardware Mode.
Table 2-7.
2.4.6.1.5
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.
29380-DSH-001-B
E1—120
T1—I.431
GENERAL NOTE:
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: HTERM = 0
3. Host Mode: ALT_TR = 0, TERM = 0, T_BOOST = 1 [TLIU_CR; addr n2]
T1—DSX-1
E1—75
E1—120
T1—I.431
GENERAL NOTE:
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: HTERM = 1
3. Host Mode: ALT_TR = 0, TERM = 1, T_BOOST = 1 [TLIU_CR; addr n2]
E1—75
E1—120
T1—I.431
GENERAL NOTE:
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]
Ω
Ω
Ω
Ω
Ω
Application
Application
Application
Transmit Termination Option C
Transmit Termination Option D
Transmit Termination Option E
Option D
Option E
Preliminary Information / Mindspeed Proprietary and Confidential
Series Resistors (Rs)
Series Resistors (Rs)
Series Resistors (Rs)
Mindspeed Technologies
2 × 5.6
2 × 5.6
2 × 5.6
2 × 5.6
2 × 5.6
2 ×5.6
None
None
None
Ω
Ω
Ω
Ω
Ω
Ω
Parallel Termination
Parallel Termination
Parallel Termination
®
(Rt,
(Rt,
(Rt,
107.0
None
None
47.5
68.1
21
21
21
21
Ω
Ω
Ω
)
)
)
Circuit Description
Return Loss (dB)
Return Loss (dB)
Return Loss (dB)
–10
–30
–18
–18
–30
–10
–10
0
0
26