Nortel Communication Server 1000 Manual page 88

88 Integrated Digital Access (IDA) equipment
The NT5D97AD DDP2 card can be mixed in the same machine with PRI2
NT8D72BA cards.
The NT5D97AD DDP2 card hardware design uses a B57 ASIC
E1/T1 framer. The carrier specifications comply with the ANSI TI.403
specification. The NT5D97AD provides an interface to the 2.048 Mbps
external digital line either directly or through an office repeater, Network
Channel Terminating Equipment (NCTE), or Line Terminating Unit (LTU).
External D-Channel Interface DCH
The connection between the DDP2 card and the external DCH 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. These are:
•
Receiver Ready (RR), originating at the DDP2 card, to indicate to the
DCH that the D-channel link is operational.
•
Transmitter Ready (TR), originating at the DCH, to indicate to the
DDP2 card that the DCH are ready to use the D-channel link.
Table 41 "DCH Receiver Ready control signals" (page 88)
the RR control signal operates with regard to the DDP2 status.
Table 41
DCH Receiver Ready control signals
RR State
ON
DANGER
DANGER OF ELECTRIC SHOCK
The NT5D97AD 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 telecommunications authority.
Condition
D-Channel data rate selected at 64 Kbps
and
PRI2 loop is enabled
and
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
indicates how