Rainbow Electronics DS2154 - Manual (Page 33)

DS2154
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RDS0M: RECEIVE DS0 MONITOR REGISTER (Address=AB Hex)
(MSB) (LSB)
B1 B2 B3 B4 B5 B6 B7 B8
SYMBOL POSITION NAME AND DESCRIPTION
B1 RDS0M.7 Receive DS0 Channel Bit 8. MSB of the DS0 channel (first bit to be
received).
B2 RDS0M.6 Receive DS0 Channel Bit 7.
B3 RDS0M.5 Receive DS0 Channel Bit 6.
B4 RDS0M.4 Receive DS0 Channel Bit 5.
B5 RDS0M.3 Receive DS0 Channel Bit 4.
B6 RDS0M.2 Receive DS0 Channel Bit 3.
B7 RDS0M.1 Receive DS0 Channel Bit 2.
B8 RDS0M.0 Receive DS0 Channel Bit 1. LSB of the DS0 channel (last bit to be
received).
7.0 SIGNALING OPERATION
The DS2154 contains provisions for both processor
based (i.e., software based) signaling bit access and for
hardware based access. Both the processor based
access and the hardware based access can be used
simultaneously if necessary. The processor based
signaling is covered in Section 7.1 and the hardware
based signaling is covered in Section 7.2.
7.1 PROCESSOR BASED SIGNALING
The Channel Associated Signaling (CAS) bits
embedded in the E1 stream can be extracted from the
receive stream and inserted into the transmit stream by
the DS2154. Each of the 30 voice channels has four
signaling bits (A/B/C/D) associated with it. The num-
bers in parenthesis () are the voice channel associated
with a particular signaling bit. The voice channel num-
bers have been assigned as described in the ITU docu-
ments. Please note that this is different than the channel
numbering scheme (1 to 32) that is used in the rest of the
data sheet. For example, voice channel 1 is associated
with timeslot 1 (Channel 2) and voice Channel 30 is
associated with timeslot 31 (Channel 32). There is a set
of 16 registers for the receive side (RS1 to RS16) and 16
registers on the transmit side (TS1 to TS16). The
signaling registers are detailed below.