參數(shù)資料
型號(hào): IDT82P20516DBFG
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 43/115頁
文件大?。?/td> 0K
描述: IC LIU T1/E1/J1 16CH SH 484BGA
標(biāo)準(zhǔn)包裝: 84
功能: 線路接口單元(LIU)
接口: E1,J1,T1
電路數(shù): 16
電源電壓: 1.8V, 3.3V
功率(瓦特): 2.89W
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 484-LFBGA
供應(yīng)商設(shè)備封裝: 484-CABGA(19x19)
包裝: 托盤
包括: AIS 警報(bào)檢測(cè)器和發(fā)生器,回送功能,PRBS 發(fā)生器 / 檢測(cè)器,遠(yuǎn)程檢測(cè)器和發(fā)生器
IDT82P20516
16-CHANNEL SHORT HAUL E1 LINE INTERFACE UNIT
Functional Description
33
December 17, 2009
3.5.3.2 System LOS (SLOS)
SLOS can only be detected when the transmit system interface is in
Dual Rail NRZ Format mode or in Dual Rail RZ Format mode.
The amplitude and density of the data input from the transmit system
side are monitored. When the input ‘0’s are equal to or more than N
consecutive pulse intervals, SLOS is declared. When the average
density of marks is at least 12.5% for M consecutive pulse intervals
starting with a mark, SLOS is cleared. Here N and M are defined by the
LAC bit (b7, LOS,...). Refer to Table-11 for details.
In E1 mode, SLOS detection supports G.775 and ETSI 300233/
I.431. The criteria are selected by the LAC bit (b7, LOS,...).
When SLOS is detected, the SLOS_S bit (b1, STAT0,...) will be set. A
transition from ‘0’ to ‘1’ on the SLOS_S bit (b1, STAT0,...) or any transi-
tion (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the SLOS_S bit (b1, STAT0,...) will
set the SLOS_IS bit (b1, INTS0,...) to ‘1’, as selected by the LOS_IES bit
(b1, INTES,...). When the SLOS_IS bit (b1, INTS0,...) is ‘1’, an interrupt
will be reported by INT if not masked by the SLOS_IM bit (b1, INTM0,...).
SLOS may be counted by an internal Error Counter. Refer to
Table-11 SLOS Criteria
Operation
Mode
LAC
Criteria
SLOS Declaring 1
SLOS Clearing 1
E1
0
G.775
no pulse detected for N consecutive pulse intervals,
N = 32 bits
12.5% mark density with less than 16 consecutive
zeros for M consecutive pulse intervals,
M = 32 bits
1
ETSI 300233/
I.431
no pulse detected for N consecutive pulse intervals,
N = 2048 bits
12.5% mark density with less than 16 consecutive
zeros for M consecutive pulse intervals,
M = 32 bits
Note:
1. System input ports are schmitt-trigger inputs)
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