DS21348

Manufacturer Part NumberDS21348
Description3.3V E1/T1/J1 Line Interface
ManufacturerDallas Semiconducotr
DS21348 datasheet
 


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RECEIVED ALARM CRITERIA Table 7-1
ALARM
E1/T1
RUA1
E1
RUA1
T1
1
RCL
E1
1
RCL
T1
NOTES:
1) Receive carrier loss (RCL) is also known as loss of signal (LOS) or Red Alarm in T1.
2) See CCR1.5 for details.
SR (06H): STATUS REGISTER
(MSB)
LUP
LDN
LOTC
SYMBOL
POSITION
LUP
SR.7
(latched)
LDN
SR.6
(latched)
LOTC
SR.5
(real time)
RUA1
SR.4
(latched)
RCL
SR.3
(latched)
TCLE
SR.2
(real time)
TOCD
SR.1
(real time)
PRBSD
SR.0
(real time)
SET CRITERIA
Less than 2 zeros in two frames
(512 bits)
Over a 3ms window, five or
fewer zeros are received
2
255 (or 2048)
consecutive zeros
received (G.775)
2
192 (or 1544)
consecutive zeros
are received
RUA1
RCL
DESCRIPTION
Loop Up Code Detected. Set when the loop up code defined in
registers RUPCD1 and RUPCD2 is being received. See Section
6 for details.
Loop Down Code Detected. Set when the loop down code
defined in registers RDNCD1 and RDNCD2 is being received.
See Section 6 for details.
Loss of Transmit Clock. Set when the TCLK pin has not
transitioned for 5msec (±2msec). Will force the LOTC pin high.
Receive Unframed All Ones. Set when an unframed all ones
code is received at RRING and RTIP. See Table 7-1for details.
Receive Carrier Loss. Set when a receive carrier loss condition
exists at RRING and RTIP. See Table 7-1for details.
Transmit Current Limit Exceeded. Set when the 50 mA (rms)
current limiter is activated whether the current limiter is enabled
or not.
Transmit Open Circuit Detect. Set when the device detects
that the TTIP and TRING outputs are open circuited.
PRBS Detect. Set when the receive-side detects a 2
20
or a 2
- 1 (T1) Pseudo Random Bit Sequence (PRBS).
35 of 73
CLEAR CRITERIA
More than 2 zeros in two frames
(512 bits)
Over a 3ms window, six or more
zeros are received
In 255 bit times, at least 32 ones
are received
14 or more ones out of 112
possible bit positions are
received starting with the first
one received
(LSB)
TCLE
TOCD
PRBSD
15
- 1 (E1)