Nortel Networks Circuit Card 311 - Manual (Page 326)

326 NT5D97 Dual-port DTI2 PRI2 card
DANGER
DANGER OF ELECTRIC SHOCK
The NT5D97 DDP2 card is not designed to be connected
directly to the Public Switched Network, or other exposed plant
networks. Such a connection should only be done using an
isolating-type networking terminating device that provides voltage
surge protection, such as a Line Terminating Unit (LTU), Network
Channel Terminating Equipment (NCTE), or Network Termination
1 (NT1), as certified by your local, regional, or national safety
agency and telecommunication authority.
Physical description
External D-Channel Interface DCH or MSDL
The connection between the DDP2 card and the external DCH or MSDL is
through a 26-pin female D type connector. The data signals conform to the
electrical characteristics of the EIA standard RS-422.
Two control signals are used to communicate the D-channel link status
to the DCH or MSDL. These are:
• Receiver Ready (RR), originating at the DDP2 card, to indicate to the
DCH or MSDL that the D-channel link is operational.
• Transmitter Ready (TR), originating at the DCH or MSDL, to indicate to
the DDP2 card that the DCH are ready to use the D-channel link.
Table 134 "DCH/MSDL Receiver Ready control signals" (page 326) indicates
how the RR control signal operates with regard to the DDP2 status.
Table 134
DCH/MSDL Receiver Ready control signals
RR State Condition
ON • D-Channel data rate selected at 64 Kbps.
• PRI2 loop is enabled.
• PRI2 link is not in OOS or Local Alarm mode state.
• PRI2 link is not transmitting a Remote Alarm pattern.
• PRI2 link is not receiving a Remote Alarm Indication from a
remote facility.
OFF All other conditions
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.