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參數(shù)資料
| 型號： | T7630 |
| 英文描述： | T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II) |
| 中文描述： | T7630雙T1/E1的5.0V的短途終結(jié)者（終結(jié)者-Ⅱ） |
| 文件頁數(shù)： | 34/210頁 |
| 文件大?。?/td> | 3075K |
| 代理商： | T7630 |
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34
Lucent Technologies Inc.
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II)
Preliminary Data Sheet
October 2000
Line Interface Unit: Transmit
(continued)
The first monitoring function is provided to detect non-
functional links and protect the LIU transmitter from
damage. The alarm is set (TDM = 1) when one of the
LIU transmitter line drivers (TTIP or TRING) is shorted
to power supply or ground, or TTIP and TRING are
shorted together. Under these conditions, internal cir-
cuitry protects the LIU transmitter from damage and
excessive power supply current consumption by forcing
the TTIP and TRING output drivers into a high-imped-
ance state. The monitor detects faults on the trans-
former primary side, but the transformer secondary
faults may not be detected. The monitor operates by
comparing the line pulses with the transmit inputs. After
32 transmit clock cycles, the LIU transmitter is powered
up in its normal operating mode. The LIU transmitter
drivers attempt to correctly transmit the next data bit. If
the error persists, TDM remains active to eliminate
alarm chatter and the transmitter is again internally
protected for another 32 transmit clock cycles. This pro-
cess is repeated until the error condition is removed,
and then the TDM alarm is deactivated. The TDM
alarm status bit will latch the alarm and remain set until
being cleared by a read (clear on read).
The second monitoring function is to indicate periods of
no data transmission. The alarm is set (TDM = 1) when
33 consecutive zeros have been transmitted. The
alarm is cleared (TDM = 0) on the detection of a single
pulse. This alarm condition does not alter the function-
ality of the signal path.
Upon the transition from TDM = 0 to TDM = 1, a micro-
processor interrupt will be generated if the TDM inter-
rupt enable bit TDMIE (register LIU_REG1, bit 2) is set.
The reset default is TDMIE = 0.
A TDM alarm may occur when RLOOP is activated and
deactivated. If the PRLALM bit is not set, then RLOOP
may activate an LOTC alarm, which will put the output
drivers TTIP and TRING in a high-impedance state as
described in loss of LIU transmit clock (LOTC) alarm.
The high-impedance state of the drivers may in turn
generate a TDM alarm.
Setting the HIGHZ alarm prevention PHIZALM = 1
(register LIU_REG4, bit 4) prevents the TDM alarm
from occurring when the drivers are in a high-imped-
ance state. The reset default is PHIZALM = 0.
DSX-1 Transmitter Pulse Template and Specifications
The DS1 pulse shape template is specified at the DSX (defined by CB119 and ANSIT1.102) and is illustrated in
Figure 10. The LIU transmitter also meets the pulse template specified by ITU-T G.703 (not shown).
5-1160(F)
Figure 10. DSX-1 Isolated Pulse Template
1.0
0.5
0
–0.5
0
250
500
750
1000
1250
TIME (ns)
N
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