DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-661DS1 CONV-BD
9
TN1654 board-pairs and TN574 board-pairs. Critic al reliability config urations with
a pair of DS1 CONV Complexes serving an EPN require identical b oard pairs and
facilities. For example, a TN574 Complex and a TN1654 Complex may not be
used together to serve the same EPN in a critic al reliability configuration .
DS1 CONV circuit packs connec t to TN570 Expansion Interface (EI) circuit pac ks
and TN573 Switch Node Interface (SNI) circ uit packs via metallic cables as
shown in Figure 9-32. A fiber link cable c an be used instead of the metallic cab le
if it is necessary to locate the DS1 CONV far from the connected EI or SNI circuit
pack, for example, in an ad jacent cabinet.
The DS1 CONV circuit pack can be p laced in any reg ular slot in a PN carrier.
However, the DS1 CONV circuit pack c an only be placed in slots 1 and 21 in a
Switch Node (SN) carrier. The DS1 CONV circuit pack is not c onnected to the
TDM bus or the SN backplane. Communic ation to the circuit pac k is done
through the connected EI or the SNI circuit packs. Therefore, there is
considerable interac tion between the DS1 CONVs and the connec ted EIs and
the SNIs. A special "Y" cable connects the DS1 CONV circuit p ack to the Fiber
Endpoint and to the facilitie s.
NOTE:
The two DS1 CONV boards, TN1654 and TN574, use unique “Y” cab les
that are incompatible with eac h other.
The TN573 SNI circuit pack is incomp atible with the TN1654 board. A TN573B or
later suffix SNI board must be used w hen connecting to a TN1654 b oard. The
TN573B SNI board is fully backward c ompatible with the TN573 b oard and can
be connected to either TN1654 or TN574 boards.
NOTE:
A TN573B or later suffix board must be used when connecting a SNI board
to a TN1654 board. Error 125 will be logg ed and an on-board minor alarm
will be generated ag ainst the SNI board if it is incomp atible with the
TN1654 circuit pack.
Figur e 9-3 3 and Figure 9-34 show DS1 CONV connections in a direc t c onnect
PNC configuration and between the CSS and an EPN in a Critical Reliability
System configuration (dupl icated PNC).