Paradyne 9128-II - Manual (Page 19)

1. About the FrameSaver SLV
9128-A2-GB20-60 April 2002 1-5
T Modem PassThru. Provides access to another device’s VT100-compatible
user interface over a dial connection. When this feature is enabled, a logical
connection between the unit’s modem and COM ports is created, allowing
access to a collocated device’s serial port via the FrameSaver unit’s internal
modem. This feature is sometimes referred to as the Router Assist feature.
T Optional ISDN Backup. When an ISDN BRI or PRI DBM (Basic Rate
Interface or Primary Rate Interface Dial Backup Module) is installed, the
following ISDN backup features are provided:
— Provides automatic dial backup through the ISDN for data when primary
frame relay network or access line failures occur, then automatically
restores data to the primary route when service returns to normal. Backup
is supported regardless of whether or not Caller ID is provisioned on the
ISDN circuit. A secondary backup phone number is also available to call
when a backup link cannot be established with the primary backup site.
— Supports simultaneous origination, answering, or origination and
answering backup calls, as needed, based upon how the ISDN Link
Profile is set up. This feature is also known as peer-to-peer calling.
— Provides automatic configuration of an alternate route and DLCI for
automatically created PVCs at either the remote site or central site based
upon the learned far-end DLCI number. When the automatic backup
feature is enabled, backup and restoration occur automatically.
— Provides backup timers that can be configured to better control the
amount of time required before backup is initiated, when a backup call will
be terminated once the failure condition clears, and a delay before normal
service is restored. These features are useful during periods of frequent
service disruption.
In addition, round trip latency thresholds can be configured that will initiate
backup when configured thresholds are exceeded.
— Supports backup call groups, where redundant PVCs can be assigned to
a specified call group. Using this feature, the unit only goes into backup
when
all PVCs in the group are down, and it returns to normal service as
soon as one PVC in the group is operational again. This feature is useful
when multiple PVCs are going to redundant central sites.
— When the SLV Sample Interval is set to 10 seconds, provides advance
detection of network problems before a DLCI Down indication is received,
to minimize data loss.
— Provides customer premises equipment (CPE) with a Backward Explicit
Congestion Notification (BECN) when backup bandwidth is not sufficient
for the traffic, allowing the CPE time to slow traffic to the ISDN before the
network starts discarding data.
— Supports Frame Relay Forum Multilink Frame Relay Implementation
Agreement – FRF.15 so backup bandwidth can be increased by
aggregating multiple B-channels over the ISDN link.
— Supports collection of call and call attempt statistical information that can
be viewed from the menu-driven user interface or via SNMP, and supports
alarm generation and call security, as well.