Rainbow Electronics DS2152 - Manual (Page 28)

DS2152
031897 28/79
RL0 RIR3.6 Receive Level BIt 0. See Table 4–1.
JALT RIR3.5 Jitter Attenuator Limit Trip. Set when the jitter attenuator FIFO reaches
to within 4 bits of it’s limit; useful for debugging jitter attenuation operation.
LORC RIR3.4 Loss of Receive Clock. Set when the RCLKI pin has not transitioned for at
least 2 us (3 us
±
1 us).
FRCL RIR3.3 Framer Receive Carrier Loss. Set when 192 consecutive zeros have
been received at the RPOSI and RNEGI pins; allowed to be cleared when
14 or more ones out of 112 possible bit positions are received.
– RIR3.2 Not Assigned. Could be any value when read.
– RIR3.1 Not Assigned. Could be any value when read.
– RIR3.0 Not Assigned. Could be any value when read.
DS2152 RECEIVE T1 LEVEL INDICATION Table 4.1
RL1 RL0 TYPICAL LEVEL RECEIVED
0 0 +2 dB to –7.5 db
0 1 –7.5 dB to –15 db
1 0 –15 dB to –22.5 db
1 1 less than –22.5 db
SR1: STATUS REGISTER 1 (Address=20 Hex)
(MSB) (LSB)
LUP LDN LOTC RSLIP RBL RYEL LRCL RLOS
SYMBOL POSITION NAME AND DESCRIPTION
LUP SR1.7 Loop Up Code Detected. Set when the loop up code as defined in the
RUPCD register is being received. See Section 12 for details.
LDN SR1.6 Loop Down Code Detected. Set when the loop down code as defined in
the RDNCD register is being received. See Section 12 for details.
LOTC SR1.5 Loss of Transmit Clock. Set when the TCLK pin has not transitioned for
one channel time (or 5.2 us). Will force the RLOS/LOTC pin high if enabled
via CCR1.6. Also will force transmit side formatter to switch to RCLKO if so
enabled via TCR1.7.
RSLIP SR1.4 Receive Elastic Store Slip Occurrence. Set when the receive elastic
store has either repeated or deleted a frame.
RBL SR1.3 Receive Blue Alarm. Set when an unframed all one’s code is received at
RPOSI and RNEGI.
RYEL SR1.2 Receive Yellow Alarm. Set when a yellow alarm is received at RPOSI and
RNEGI.
LRCL SR1.1 Line Interface Receive Carrier Loss. Set when 192 consecutive zeros
have been detected at RTIP and RRING. See Table 4–2.
RLOS SR1.0 Receive Loss of Sync. Set when the device is not synchronized to the
receive T1 stream.