Nortel Communication Server 1000S Installation And Configuration Manual page 74

Page 74 of 394 ISDN Primary Rate Interface equipment overview
553-3001-201 Standard 2.00
Table 15 indicates how the RR control signal operates with regard to the DDP
status.
Table 15
DCHI/MSDL Receiver Ready control signals
RR State Condition
ON D-Channel data rate selected at 64 Kbps or 56 Kbps or
64 Kbps inverted
and
PRI loop is enabled
and
PRI link is not in RED alarm mode state
and
PRI link is not transmitting a yellow alarm pattern
and
PRI link is not receiving a Remote Alarm Indication
from the remote facility
and
PRI link is not in FA3 mode
and
Transmitter Ready (TR) control signal from the
DCHI/MSDL is ON
OFF All other conditions
September 2004