Excalibur ISX 5312, Руководство по эксплуатации

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Introduction
1-7
Integral DSU/CSU
The ISX 5312/5314 has an integral DSU/CSU, which allows direct connection to the T-1
line and allows the carrier to access performance register information for monitoring
purposes. This feature eliminates the need for an external access device and minimizes
space requirements. For units with two T-1 line interfaces, one DSU/CSU can be used
for protection switching or the drop and insert function.
Protection Switching
DS0 channels can be assigned to a particular T-1 link and automatically switched to a
backup link in the event the primary link fails. This feature is available only for units
with two T-1 line interfaces. The ISX 5312/5314 provides two methods of protection
switching. Both can be enabled or disabled from the front panel.
• Access Protection Capability (APC) - Accunet’s T1.5 APC service function
provides the automatic transfer between two Accunet T1.5 access facilities when
one T-1 line fails. The criteria required for the transfer are defined in AT&T
Technical Reference 54017A1.
• Hot Spare - The ISX 5312/5314 provides the automatic transfer to a spare T-1 line
when the primary T-1 line fails, or from the spare line to the primary line when the
primary line is in good state. The criteria required for the transfer are Red, Blue,
and Yellow alarm conditions as defined in AT&T Technical Reference 54016.
Drop-and-Insert Capability
Drop-and-insert capability at the DS0 level allows you to connect a T-1 PBX or other T-
1 device with underutilized bandwidth to the ISX 5312/5314. This feature eliminates the
need for a separate T-1 circuit to support the PBX voice application or other data
applications.
T7 via Dial Modems
The ISX 5312/5314 provides a T7 path via dial modems and a Public Switched
Telephone Network (PSTN) line. You can use Milgo’s ALM 3226 dial modem or any
dial modem that supports Hayes AT operation. The modem link can be established
automatically, manually, or in response to CMS network management commands.
When set for automatic operation, the ISX 5312/5314 automatically initiates calls in
response to user-selectable criteria (Red, Blue, and Yellow alarms). With manual
operation, calls can be initiated by pressing the proper buttons on the ISX 5312/5314’s
front panel or the CMS console.