Demand test descriptions and error codes - Avaya Support

Figure 89: Duplex-Reliability Configuration
Standard Reliability
TONE-BD (Tone-Clock Circuit Pack)
Systems with the standard-reliability option (no duplication options) have one Tone-Clock circuit
pack in each port network. For the first Port Network of a cabinet this is in the A carrier. Cabinets
containing a second EPN will also have a Tone-Clock circuit pack in the E carrier. This
Tone-Clock circuit pack generates clocks and provides system tones for every carrier of the port
network it resides in.
High Reliability
IPSI
PN 1
EI
Server A Server B
Control Network A
IPSI
PN 2
EI
Bearer Network
S8700-series Fiber-PNC: The high-reliability configuration shown in Figure 90: High-Reliability
Configuration has a duplicated server, a duplicated control network, and duplicated IPSIs in the
IPSI connected port networks. With this configuration, every IPSI connected PN must have
duplicated IPSIs. The control network is duplicated so that a single fault in the control network,
such as a bad Ethernet switch, won’t bring the whole system down. The non IPSI connected
port networks have unduplicated Tone-Clock boards.
An EPN’s Tone-Clock circuit pack configuration is the same as for the standard-reliability option.
Each PN’s Tone-Clock circuit is active for both tones and clock signals for its port network.
T/C
PN 3
EI
Issue 5 May 2009 991