Ds-30A Links; Electronic Business Set Signaling - Nortel DMS-100 Series Maintenance Manual

2-10 Signaling for RLCM-EDC
recordings on tape at the machine. After each DTMF signal of 130 ms, a
reconnection of the PCM signal occurs.

DS-30A links

The DS30A channel frames carry speech information or message
information. The following figure is the format of a DS30A frame. The
DS30A links operate at a rate of 2.56 Mbyte/s with a sampling frequency of
8000 frames each second. The DS30A link frame consists of 32 channels.
Each channel contains 10 bits of pulse code modulation (PCM) data.
DS-30A frame format
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 21 23 24 25 26 27 28 29 30 31
1 channel = 3.9 micro seconds
10 9 8 7 6 5 4 3 2 1 0
Speech
channel
Message
channel

Electronic business set signaling

Electronic Business Set (EBS) signaling enables call processing software to
communicate directly with the EBS terminal. An above-voice frequency,
low-speed data channel transports the EBS messaging over the loop. This
data channel sends signaling information over a separate D-channel between
the RLCM-EDC and the host.
297-8381-550 Standard 02.02 April 1999
1 frame = 125 micro seconds
Speech PCM
Message data
Parity bit
Channel supervision bit
Frame synchronizing (channel 0 only)
Not in use