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| 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)： | 82/210頁 |
| 文件大?。?/td> | 3075K |
| 代理商： | T7630 |
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Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)
82
L Lucent Technologies Inc.
Alarms and Performance Monitoring
(continued)
Table 38. Red Alarm or Loss of Frame Alignment Conditions
2.
Yellow alarm
or the
remote frame alarm
(FRM_SR1 bit 0).
This alarm is an indication that the line remote end is in a loss of frame alignment state. Indication of remote frame
alarm (commonly referred to as a yellow alarm) as for the different framing formats is shown in Table 39.
Table 39. Remote Frame Alarm Conditions
3.
Blue alarm
or the
alarm indication signal
(AIS).
The alarm indication signal (AIS), sometimes referred to as the blue alarm, is an indication that the remote end is
out of service. Detection of an incoming alarm indication signal is defined in Table 40.
Table 40. Alarm Indication Signal Conditions
Framing Format
Number of Errored Framing Bits That Will Cause a Red Alarm
(Loss of Frame Alignment) Condition
2 errored frame bits (F
T
or F
S
) out of 4 consecutive frame bits if FRM_PR10 bit 2 = 1.
2 errored F
T
bits out of 4 consecutive F
T
bits if PRM_PR10 bit 2 = 0.
2 errored frame bits (F
T
or F
S
) out of 4 consecutive frame bits if FRM_PR10 bit 2 = 1.
2 errored F
T
bits out of 4 consecutive F
T
bits if FRM_PR10 bit 2 = 0.
3 errored frame bits (F
T
or F
S
) or channel 24 FAS pattern out of 12 consecutive frame bits.
2 errored F
E
bits out of 4 consecutive F
E
bits or, optionally, 320 or more CRC6 errored
checksums within a one second interval if loss of frame alignment due to excessive CRC-6
errors is enabled in FRM_PR9.
Three consecutive incorrect FAS patterns or three consecutive incorrect NOT FAS patterns;
or optionally, greater than 914 received CRC-4 checksum errors in a one second interval if
loss of frame alignment due to excessive CRC-6 errors is enabled in FRM_PR9.
D4
SLC-96
DDS: Frame
ESF
CEPT
Framing Format
Superframe: D4
Superframe: D4-Japanese
Superframe: DDS
Extended Superframe (ESF)
CEPT: Basic Frame
CEPT: Signaling Multiframe
Remote Frame Alarm Format
Bit 2 of all time slots in the 0 state.
The twelfth framing bit in the 1 state in two out of three consecutive superframes.
Bit 6 of time slot 24 in the 0 state.
An alternating pattern of eight ones followed by eight zeros in the ESF data link.
Bit 3 of the NOT FAS frame in the 1 state in three consecutive frames.
Bit 6 of the time slot 16 signaling frame in the 1 state.
Framing Format
T1
Remote Frame Alarm Format
Loss of frame alignment occurs and the incoming signal has two or fewer zeros in each of
two consecutive double frame periods (386 bits).
As described in ETS 300 233:1994 Section 8.2.2.4, loss of frame alignment occurs and
the framer receives a 512 bit period containing two or less binary zeros. This is enabled
by setting register FRM_PR10 bit 1 to 0.
As described in ITU Rec. G.775, the incoming signal has two or fewer zeros in each of
two consecutive double frame periods (512 bits). AIS is cleared if each of two consecutive
double frame periods contains three or more zeros or frame alignment signal (FAS) has
been found. This is enabled by setting register FRM_PR10 bit 1 to 1.
CEPT ETSI
CEPT ITU
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