Datasheet

DS21Q58 E1 Quad Transceiver

30 of 74

SR1

Status Register 1

0A Hex

Bit # 7 6 5 4 3 2 1 0

Name RSA1 RDMA RSA0 RSLIP RUA1 RRA RCL RLOS

NAME BIT FUNCTION

RSA1 7

Receive Signaling All Ones. Set when the contents of time slot 16 contains fewer

than three zeros over 16 consecutive frames. This alarm is not disabled in the

CCS signaling mode. Both RSA1 and RSA0 are set if a change in signaling is

detected.

RDMA 6

Receive Distant MF Alarm. Set when bit 6 of time slot 16 in frame 0 has been set

for two consecutive multiframes. This alarm is not disabled in the CCS signaling

mode.

RSA0 5

Receive Signaling All Zeros. Set when over a full MF, time slot 16 contains all

zeros. Both RSA1 and RSA0 are set if a change in signaling is detected.

RSLIP 4

Receive Elastic Store Slip. Set when the elastic store has either repeated or

deleted a frame of data.

RUA1 3

Receive Unframed All Ones. Set when an unframed all-ones code is received at

RTIP and RRING.

RRA 2

Receive Remote Alarm. Set when a remote alarm is received at RTIP and

RRING.

RCL 1

Receive Carrier Loss. Set when 255 (or 2048 if CCR2.1 = 1) consecutive zeros

have been detected at RTIP and RRING.

RLOS 0

Receive Loss of Sync. Set when the device is not synchronized to the receive E1

stream.