參數(shù)資料
型號(hào)： TLIU04C1
廠商： Lineage Power
英文描述： Quad T1/E1 Line Interface(四T1/E1線接口)
中文描述： 四T1/E1線路接口（四個(gè)T1/E1線接口）
文件頁(yè)數(shù)： 22/100頁(yè)
文件大?。?/td> 1321K
代理商： TLIU04C1
Advance Data Sheet, Rev. 2
TLIU04C1 Quad T1/E1 Line Interface
April 1999
22
Lucent Technologies Inc.
Microprocessor Mode
(continued)
Receiver Configuration Modes
(continued)
RLIU Alarms
(continued)
During CEPT operation, DLOS is indicated when 255 or more consecutive zeros occur in the receive data stream.
The DLOS indication is deactivated when the average ones density of at least 12.5% is received in 255 contiguous
pulse positions. LOSSTD has no effect in CEPT mode.
Upon the transition from DLOS = 0 to DLOS = 1, a microprocessor interrupt will be generated if the corresponding
DLOS interrupt mask bit (MDLOS; registers 2 and 3, bits 1 and 5), the channel mask bit (MASK; registers 6—9,
bit 1) or the global mask bit (GMASK; register 4, bit 0) is not set.
The DLOS alarm may occur when FLLOOP is activated (see Loopbacks on page 41) due to the abrupt change in
signal level at the receiver input. Setting the FLLOOP alarm prevention, PFLALM = 1 (register 12, bit 2), prevents
the DLOS alarm from occurring when FLLOOP is activated by quickly resetting the receiver’s internal peak detec-
tor. It will not prevent the DLOS alarm during the FLLOOP period but only avoids the alarm created by the signal
amplitude transient.
Loss Shutdown (LOSSD) and Receiver AIS (RCVAIS).
The loss shutdown control bit (LOSSD; register 5, bit 7)
acts in conjunction with the receive alarm indication select (RCVAIS) control bit (register 12, bit 1) to place the digi-
tal outputs in a predetermined state when a digital loss of signal (DLOS) or analog loss of signal (ALOS) alarm
occurs.
If LOSSD = 0 and RCVAIS = 0, the RND, RPD, and RCLK outputs will be unaffected by the DLOS alarm condition.
However, when an ALOS alarm condition is indicated in the alarm status registers, the RPD and RND outputs are
forced to their inactive state (dependent on ALM state) and the RCLK free runs (based on XCLK frequency).
If LOSSD = 0, RCVAIS = 1, and a DLOS or an ALOS alarm condition is indicated in the alarm status registers, the
RPD and RND outputs will present an alarm indication signal (AIS, all ones) based on the free-running clock fre-
quency, and the RCLK free runs.
If LOSSD = 1, regardless of the state of RCVAIS, and a DLOS or an ALOS alarm condition is indicated in the alarm
status registers, the RPD and RND outputs are forced to their inactive state (dependent on ALM state) and the
RCLK free runs.
The RND, RPD, and RCLK signals will remain unaffected if any loopback (FLLOOP RLOOP DLLOOP) is activated
independent of LOSSD and RCVAIS settings.
The LOSSD and RCVAIS behavior is summarized in Table 9.
Table 8. Digital Loss of Signal Standard Select
LOSSTD
0
1
DS1 Mode
CEPT Mode
ITU-T G.775
ITU-T G.775
T1M1.3/93-005, ITU-T G.775
TR-TSY-000009
Table 9. LOSSD and RCVAIS Control Configurations (Not Valid During Loopback Modes)
LOSSD
RCVAIS
ALARM
RPD/RND
RCLK
0
0
ALOS
0 if ALM = 1, 1 if ALM = 0
Free Runs
0
0
DLOS
Normal Data
Recovered Clock
0
1
ALOS
AIS (all ones)
Free Runs
0
1
DLOS
AIS (all ones)
Free Runs
1
X
ALOS
0 if ALM = 1, 1 if ALM = 0
Free Runs
1
X
DLOS
0 if ALM = 1, 1 if ALM = 0
Free Runs
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