ISU 512
512 kbps ISDN Inverse Multiplexer
Product Features
■
Basic inverse multiplexer
supports a single high-
speed data application rate
■
Low-cost inverse
multiplexing
■
Applications include
video conferencing,
LAN/WAN connectivity,
high-speed file transfer,
and T1 backup
■
Supports up to four ISDN
Basic Rate lines
■
Operates at synchronous
data rates of up to 512 kbps
■
Supports industry stan-
dard BONDING
■
Dialing options include
front panel, stored number,
V.25 bis, DTR dialing, and
an RS-366 dial interface
■
Flash memory for easy
upgrades
■
Remote configuration over
ISDN line or externally
■
Compatible with Lucent
5ESS
®
, Northern Telecom
DMS-100
™
, and National
ISDN-1 switches
■
Industry-leading five-year
North American warranty
The ADTRAN
®
ISU 512
™
is a standalone ISDN
Service Unit that connects data terminal
equipment (DTE) to the ISDN network.
The ISU 512 is “specifically designed as a
low-cost solution for applications such as
video-conferencing, T-1 backup, LAN/WAN
connectivity, and high-speed file transfer.
The ISU 512 is designed as a cost
effective inverse multiplexer for 384 kbps
videoconferencing. Some videoconferencing
products operate in a dual port mode. The
ISU 512 is designed to operate in a dual port
mode making it backward compatible with
videoconferencing systems utilizing two
Switched 56 DSUs or a dual port ISDN
terminal adapter.
The ISU 512 connects directly to the ISDN
network using up to four Basic Rate ISDN
(BRI) lines. By terminating four BRI circuits,
the ISU 512 can create an aggregate band-
width of up to 512 kbps which can be used
to backup a T-1 circuit.
Since ISDN is a switched digital service,
bandwidth can be established and utilized
on an as needed basis. Therefore, the ISU 512
is well suited for applications where a high
bandwidth connection is needed to support
bursty or infrequent traffic like medical image
or large file transfer.
The ISU 512 may utilize either the V.35 or
RS-530 DTE interface and supports synchro-
nous data rates from 56 kbps to 512 kbps.
At rates over 64 kbps, the BONDING
Mode 1 inverse multiplexing protocol
synchronizes data using from one to
eight 64 kbps B channels. By supporting
BONDING the ISU 512 interoperates with
other BONDING-compatible inverse multi-
plexers and ISDN terminal adapters.
The ISU 512 can be configured and
maintained, locally or remotely, using a
VT100 terminal interface. For remote configu-
ration, the unit can be accessed over the ISDN
line or externally through the CHAIN IN port
on the back panel of the unit.
The front panel of the ISU 512 consists
of a two-line by 16 character LCD display,
seven LEDs, and a 16-button keypad. This
allows for configuring, dialing, testing, and
monitoring of the unit without data terminal
or test equipment.
Dialing from the unit is accomplished
by using the front panel, stored numbers,
DTR assertion, or V.25 bis in-band dialing.
The RS-366 parallel dial interface is available
for applications such as videoconferencing.
The ISU 512 also supports dedicated 2B1Q
services. This provides a dedicated point-to-
point service (as in a limited distance
modern or leased line application) with
no dialing necessary.
