Demand test descriptions and error codes - Avaya Support

Figure 90: High-Reliability Configuration
Server A Server B
Control Network A Control Network B
IPSI IPSI
PN 1
EI
IPSI IPSI
PN 2
Systems with the High Reliability Option have one Tone-Clock circuit pack in each Port Network
control carrier, A and B. One Tone-Clock circuit pack will be actively generating system clock
signals for Port Network components, while the other will be in standby mode, ready to take
over in the event of a Tone-Clock interchange. Similarly, one Tone-Clock circuit pack will be
actively providing system tones for the Port Network, while the other will be in standby mode.
Normally, the same Tone-Clock circuit pack will be active for both tones and clock signals, but
these responsibilities may be divided if neither circuit pack is able to perform both functions. The
status port-network command indicates which Tone-Clock circuit pack is actively
performing each function.
For systems using the TN2182 Tone-Clock-Detector circuit pack, tone generation and clock
generation behaves the same as other clock boards with one being active and one being
standby. But the tone detector ports (ETR-PTs) of the TN2182 are always considered available
and in-service regardless of the active/standby state of the tones or clock for a specific circuit
pack.
EPN Tone-Clock circuit pack configuration is the same as for the Standard Reliability Option.
Each EPN Tone-Clock circuit pack will be active for both tones and clock signals for its port
network.
PN 3
992 Maintenance Alarms for Communication Manager, Media Gateways and Servers
EI
Bearer Network
T/C
EI