Esa Capability - Nortel DMS-100 Series Maintenance Manual

detecting talk battery failures. There are three ways to work around this
condition.
— BSY/RTS the Star Hub. This is not recommended because of the
service outage, but the WLC will be in the correct HASU maintenance
state so the Star Hub can use it for talk battery testing.
— Assign a DN to the WLC so the Star Hub can use the WLC for talk
battery testing.
— Assign a second WLC on the same line drawer shelf. This WLC can
remain as HASU without a DN assigned.
The second option is the easiest work around. The third option requires
additional hardware (an additional WLC), but provides redundancy for the
Talk Battery Alarm feature.

ESA capability

If the Star Hub loses communication with the host because of a message link
or DS-1 card failure and detects DS-1 alarms on both links, the Star Hub enters
ESA to operate independently. The ESA operation continues until both
conditions that initiated the ESA action are removed.
The Star Hub supports ESA warm entry and cold exit. Warm entry means
established calls, except for ISDN calls, are maintained during entry into ESA
mode. This is because the call processing software (Q.931) resides in the host
LTC, line group controller (LGC), or remote cluster controller 2 (RCC2). Cold
exit mean that all calls, including established calls and calls being established,
are released. Before the Star Hub actually exits ESA, a timeout makes sure the
DS-1 alarms or host communication are permanently restored. The timeout is
defined in table OFCENG, parameter RLCM_XPMESAEXIT. This timeout
prevents the Star Hub from transferring in and out of ESA.
While in ESA, the Star Hub supports all telephones. In addition, the following
calls are not supported:
• multiple appearance directory number (MADN) secondary parties
• proprietary phone (P-Phone) keys except for the primary DN
(key number 1)
• activation and deactivation of custom calling features
• ISDN calls
Call progress tones are partially supported. Because no features are supported
during ESA, many of the call progress tones are not required. The ESA call
progress tones and detection of DTMF dialing are supported by the
NTTR73AA universal maintenance pack (UMP).
Star Remote System automatic maintenance 4-15
DMS-100 Family NA100 Star Remote System XPM15 and up