Rainbow Electronics DS2153Q - Manual (Page 15)

DS2153Q
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CRC4 SYNC COUNTER
The CRC4 Sync Counter increments each time the 8 ms
CRC4 multiframe search times out. The counter is
cleared when the DS2153Q has successfully obtained
synchronization at the CRC4 level. The counter can
also be cleared by disabling the CRC4 mode
(CCR1.0=0). This counter is useful for determining the
amount of time the DS2153Q has been searching for
synchronization at the CRC4 level. Annex B of CCITT
G.706 suggests that if synchronization at the CRC4
level cannot be obtained within 400 ms, then the search
should be abandoned and proper action taken. The
CRC4 Sync Counter will rollover.
SR1: STATUS REGISTER 1 (Address=06 Hex)
(MSB) (LSB)
RSA1 RDMA RSA0 RSLIP RUA1 RRA RCL RLOS
SYMBOL POSITION NAME AND DESCRIPTION
RSA1 SR1.7 Receive Signaling All Ones. Set when the contents of timeslot 16 con-
tains less than three zeros over 16 consecutive frames. This alarm is not
disabled in the CCS signaling mode.
RDMA SR1.6 Receive Distant MF Alarm. Set when bit 6 of timeslot 16 in frame 0 has
been set for two consecutive multiframes. This alarm is not disabled in the
CCS signaling mode.
RSA0 SR1.5 Receive Signaling All Zeros. Set when over a full MF, timeslot 16 con-
tains all zeros.
RSLIP SR1.4 Receive Elastic Store Slip Occurrence. Set when the elastic store has
either repeated or deleted a frame of data.
RUA1 SR1.3 Receive Unframed All Ones. Set when an unframed all ones code is
received at RTIP and RRING.
RRA SR1.2 Receive Remote Alarm. Set when a remote alarm is received at RTIP and
RRING.
RCL SR1.1 Receive Carrier Loss. Set when 255 consecutive zeros have been
detected at RTIP and RRING.
RLOS SR1.0 Receive Loss of Sync. Set when the device is not synchronized to the
receive E1 stream.