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Total Access 1248 Quad T1 IMA 48-Port DSLAM with Modem Installation and Maintenance Practice
DESCRIPTION
The Total Access 1248 is a mini-DSLAM that accepts up to four T1 network feeds assigned to
a single IMA group. Inverse Multiplexing over ATM (IMA) is a technology used to bond multiple
(DS1) links into a single data pipe.
The Total Access 1248 provides ADSL2+ service for up to 48 subscribers per unit. Plain Old
Telephone Service (POTS) is brought in from an on-board splitter and is placed on the same
pair as the ADSL2+ signal. Since ADSL2+ and POTS are transported on the same twisted pair,
the subscriber must use a low-pass filter on the line before attempting to use analog services.
The lines are configured for service with flow-through provisioning using a network configu-
ration application such as Telcordia's Network Configuration (NCON). Permanent Virtual
Circuits (PVCs) in the ATM network to the subscriber's chosen Internet Service Provider (ISP)
allow the subscriber access to the internet.
The Total Access 1248 contains a V.90 internal modem for remote access.
The Total Access 1248 is rack-mountable and measures 1.75 inches (1U) high, 17.25 inches
wide, and 11.125 inches deep (measurements do not include the mounting brackets). The
device may be powered using one or two –48 VDC sources, one for a non-redundant power
configuration, two for a redundant power configuration.
For detailed specification information on the Total Access 1248 system, refer to
Specifications".
Features
The Total Access 1248 system incorporates the following features:
• Front panel indication of network, customer, and power/self-test status
• 48 ports of ADSL2+ plus POTS
• Redundant power inputs
• POTS service is not power dependent
• Removable front-accessible fan module (P/N 1179675L1)
• Supports IMA for up to four T1/E1 IMA links
• ADSL options provisionable to accommodate both short and long haul T1s
• Provisioning and alarm monitoring via TL1, SNMP, local craft interface, and inband
management channel
• IMA group support (one group)
• Operates over an extended temperature range of –40°C to +70°C
• Interoperable with any ATM T1 IMA device built to current IMA specifications, which
includes the Total Access 3000 IMA Aggregation System
• Compliant with GR-63-CORE/GR-1089-CORE (NEBS), and Listed to the applicable UL
Safety Standard(s)
• Integrated V.90 modem
• Expansion capabilities for a total of three Total Access 1248 chassis to a Host unit
• In-band management of the expansion chassis
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