Specifications

2-10
Reference Guide
Model No.
Running Head
Data Modules and Applications Applications
2.4.2 HSU Application Example
A major Health Maintenance Organization has numerous locations which have a Central main
hospital facility and smaller satellite facilities. The HMO cannot afford to fully staff each main
and satellite site with specialist. As patients enter the satellite facilities, video and audio
sessions can be established with the specialists at the Main hospital. Although the satellite
sites are not equipped with Intensive Care Units, emergencies can be admitted and support
solicited from the Main hospital personnel as shown in Figure 2-4.
Figure 2-4. Point to MultiPoint One-Way Video and Audio using HSUs
2.4.3 SRU Card
The SRU card enables high density connectivity for local, synchronous or asynchronous
peripherals. The 8220 SRU Card allows connections of up to ten RS-232, low-speed and
medium-speed (300 bps to 38.4 kbps) data terminals to the integrated access system. Since an
SRU port does not require a complete 64Kbps time slot, the Sub-Rate card allows you to
multiplex a number of devices into a single, subdivided time slot on a WAN card. SRU card
ports can also be multiplexed with voice traffic on an ADPCM engine.
Each RS-232 port can be independently programmed for synchronous (including HDLC) or
asynchronous operation. Synchronous operation is available at speeds of 2.4 Kbps up to 38.4
Kbps while for asynchronous the range is 300 bps up to 38.4 Kbps. Each synchronous port can
receive timing from either the DTE device or the system clock. If the DTE supplies the
transmit clocking, it must be synchronized with the system clocking source. For each
asynchronous data port, the stop bits, data bits and parity are user configurable. The SRU
Video Codec
Main
Medical
Facility
Remote
Medical
Facility
Remote
Medical
Facility
Multichannel
Conferencing Unit
FT1
FT1
FT1
1 WAN
Card
1 WAN
IAD
IAD
Video Codec
IAD
Video Codec