Avaya S8700 Maintenance Manual page 1406

Maintenance-Object Repair Procedures
The TN1654 board is not compatible with the TN574 board. A DS1 CONV
complex may consist of two TN574 boards or two TN1654 boards, but a TN574
cannot be combined with a TN1654 in the same complex. A system with multiple
DS1 CONV-remoted PNs may contain DS1 CONV complexes of both types,
TN1654 board-pairs and TN574 board-pairs. Critical-reliability configurations with
a pair of DS1 CONV complexes serving an PN require identical board pairs and
facilities. For example, a TN574 complex and a TN1654 complex may not be
used together to serve the same PN in a critical-reliability configuration.
DS1 CONV circuit packs connect to TN570 Expansion Interface (EI) circuit packs
and TN573 Switch Node Interface (SNI) circuit packs via metallic cables as shown
in Figure 8-29 on page
metallic cable if it is necessary to locate the DS1 CONV far from the connected EI
or SNI circuit pack, for example, in an adjacent cabinet.
The DS1 CONV circuit pack can be placed in any regular slot in a PN carrier.
However, the DS1 CONV circuit pack can only be placed in slots 1 and 21 in a
Switch Node (SN) carrier. The DS1 CONV circuit pack is not connected to the
TDM bus or the SN backplane. Communication to the circuit pack is done through
the connected EI or the SNI circuit packs. Therefore, there is considerable
interaction between the DS1 CONVs and the connected EIs and the SNIs. A
special "Y" cable connects the DS1 CONV circuit pack to the Fiber Endpoint and
to the facilities.
NOTE:
The two DS1 CONV boards, TN1654 and TN574, use unique "Y" cables that
are incompatible with each other.
The TN573 SNI circuit pack is incompatible with the TN1654 board. A TN573B
(or higher-suffixed) SNI board must be used when connecting to a TN1654 board.
The TN573B SNI board is fully backward compatible with the TN573 board and
can be connected to either TN1654 or TN574 boards.
NOTE:
A TN573B (or higher-suffixed) board must be used when connecting a SNI
board to a TN1654 board. Error 125 will be logged and an on-board minor
alarm will be generated against the SNI board if it is incompatible with the
TN1654 circuit pack.
Figure 8-30 on page 8-685
connections in a direct-connect PNC configuration and between the CSS and an
PN in a critical-reliability system configuration (duplicated PNC).
8-684 Issue 1 May 2002
8-685. A fiber link cable can be used instead of the
and Figure 8-31 on page 8-686 show DS1 CONV
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