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参数资料
型号： IDT82P2828BHG
厂商： IDT, Integrated Device Technology Inc
文件页数： 125/154页
文件大小： 0K
描述： IC LIU T1/J1/E1 28+1CH 640-PBGA
标准包装： 5
类型： 线路接口装置（LIU）
规程： E1
电源电压： 3.13 V ~ 3.47 V
安装类型： 表面贴装
封装/外壳： 640-BGA 裸露焊盘
供应商设备封装： 640-PBGA-EP（31x31）
包装： 托盘
其它名称： 82P2828BHG
IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Miscellaneous
72
February 6, 2009
4.3
POWER UP
No power up sequencing for the VDD inputs (1.8 V and 3.3 V) has to
be provided for the IDT82P2828. A Power-on reset will be initiated
during power up. Refer to Section 4.1 Reset.
4.4
HITLESS PROTECTION SWITCHING (HPS) SUM-
MARY
In today’s telecommunication systems, ensuring no traffic loss is
becoming increasingly important. To combat these problems, redun-
dancy protection must be built into the systems carrying this traffic.
There are many types of redundancy protection schemes, including 1+1
and 1:1 hardware protection without the use of external relays. Refer to
Figure-47, Figure-48 and Figure-49 for different protection schemes.
The IDT82P2828 provides an enhanced architecture to support both
protection schemes.
IDT82P2828 highlights for HPS support:
Independent programmable receive and transmit high impedance
for Tip and Ring inputs and outputs to support 1+1 and 1:1 redun-
dancy
Fully integrated receive termination, required to support 1:1 redun-
dancy
Enhanced internal architecture to guarantee High Impedance for
Tip and Ring Inputs and Outputs during Power Off or Power Fail-
ure
Asynchronous hardware control (OE, RIM) for fast global high
impedance of receiver and transmitter (hot switching between
working and backup board)
Figure-47 1+1 HPS Scheme, Differential Interface (Shared Common Transformer)
1:2
Tx
LIU on primary line card
LIU on backup line card
backplane
interface card
1:1
Tx
Rx
120
OE
RIM
OE
RIM
Hot switch control
VDDTn
VDDTn
VDDRn
VDDRn
VDDTn
VDDTn
VDDRn
VDDRn
Rx:
Partially Internal Impedance Matching mode. A fixed external 120
resistor is placed on the backplane and provides a common termination for
T1/J1/E1 applications. The R_TERM[2:0] bits (b2~0, RCF0,...) setting is as follows: ‘000’ for T1 100
twisted pair cable, ‘001’ for J1 110 twisted
pair cable, ‘010’ for E1 120
twisted pair cable and ‘011’ for E1 75 coaxial cable.
Tx:
Internal Impedance Matching mode. The
T_TERM[2:0] bits (b2~0, TCF0,...) setting is as follows: ‘000’ for T1 100 twisted pair cable, ‘001’
for J1 110
twisted pair cable, ‘010’ for E1 120 twisted pair cable and ‘011’ for E1 75 coaxial cable.
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