cx28380 Mindspeed Technologies, cx28380 Datasheet - Page 33

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

Table 2-4.
2.4.6.1.2
Option B uses the standard 1:2 transformer and no series protection resistors (Rs). A common parallel termination
(Rt) for both T1 and E1 applications is included to provide line impedance matching. Option B is applicable in Host
Mode only.
Table 2-5.
2.4.6.1.3
Option C uses the standard 1:2 transformer 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. Series
protection resistors (Rs) are included. Option C is available in both Host Mode and Hardware Mode.
Table 2-6.
29380-DSH-001-B
T1—DSX-1
E1—75
E1—120
T1— I.431
GENERAL NOTE:
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: Not applicable.
3. Host Mode: ALT_TR = 0, TERM = 0, T_BOOST = 0 [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: not applicable
3. Host Mode: ALT_TR = 0, TERM = 1, T_BOOST = 0 [TLIU_CR; addr n2]
T1—DSX-1
E1—75
Ω
Ω
Ω
Ω
Ω
Application
Application
Application
Transmit Termination Option A
Transmit Termination Option B
Transmit Termination Option C
Option B
Option C
Preliminary Information / Mindspeed Proprietary and Confidential
Series Resistors (Rs)
Series Resistors (Rs)
Series Resistors (Rs)
Mindspeed Technologies
2 × 5.6
2 × 5.6
None
None
None
None
None
None
None
None
Ω
Ω
Parallel Termination
Parallel Termination
Parallel Termination
®
(Rt,
(Rt,
(Rt,
None
None
None
31.6
51.1
23.7
23.7
23.7
23.7
28.7
Ω
Ω
Ω
)
)
)
Circuit Description
Return Loss (dB)
Return Loss (dB)
Return Loss (dB)
–10
–10
–30
–18
–18
–30
–10
0
0
0
25