DS2148 datasheet(36/75 Pages) DALLAS

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DS2148/Q48

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RECEIVED ALARM CRITERIA Table 7-1

ALARM

E1/T1

SET CRITERIA

CLEAR CRITERIA

RUA1

Less than two zeros in two

frames (512 bits)

More than two zeros in two

frames (512 bits)

RUA1

Over a 3ms window, five or less

zeros are received

Over a 3ms window, six or more

zeros are received

RCL1

255 (or 2048)2 consecutive zeros

received

(G.775)

In 255 bit times, at least 32 ones

are received

RCL1

192 (or 1544)2 consecutive zeros

are received

14 or more ones out of 112

possible bit positions are

received starting with the first

one received

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)

(LSB)

LUP

LDN

LOTC

RUA1

RCL

TCLE

TOCD

PRBSD

SYMBOL

POSITION

DESCRIPTION

LUP

(latched)

SR.7

Loop Up Code Detected. Set when the loop up code defined in

registers RUPCD1 and RUPCD2 is being received. See Section

6 for details.

LDN

(latched)

SR.6

Loop Down Code Detected. Set when the loop down code

defined in registers RDNCD1 and RDNCD2 is being received.

See Section 6 for details.

LOTC

(real time)

SR.5

Loss of Transmit Clock. Set when the TCLK pin has not

transitioned for 5

msec (±2msec). Will force the LOTC pin high.

RUA1

(latched)

SR.4

Receive Unframed All Ones. Set when an unframed all ones

code is received at RRING and RTIP. See Table 7-1for details.

RCL

(latched)

SR.3

Receive Carrier Loss. Set when a receive carrier loss condition

exists at RRING and RTIP. See Table 7-1for details.

TCLE

(real time)

SR.2

Transmit Current Limit Exceeded. Set when the 50mA (rms)

current limiter is activated whether the current limiter is enabled

or not.

TOCD

(real time)

SR.1

Transmit Open Circuit Detect. Set when the device detects

that the TTIP and TRING outputs are open circuited.

PRBSD

(real time)

SR.0

PRBS Detect. Set when the receive-side detects a 215-1 (E1) or

a 220-1 (T1) Pseudo Random Bit Sequence (PRBS).

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