The Supermux 790 is an intelligent network concentrator that provides
multi-trunk statistical multiplexing, alternate routing and host
computer selection capabilities. In addition, the 790 offers
centralized control of all resources in multinode networks and
assures users of reliable, error-free data transmission.
The Supermux 790 can be configured in various multipoint network
arrangements with other 790 units and with Infotron Supermux 480,
680 and 780 statistical multiplexers. It can be expanded in size
and capability to handle switching, port selection and contention.
The Supermux 790 accommodates any combination of synchronous and
asynchronous, dial-up and dedicated inputs at speeds to 9600 bps.
Using statistical techniques, it concentrates up to 448 inputs
for transmission to as many as eight different remote nodal locations
at speeds as high as 72,000 bps.
Each new Infotron product is carefully engineered to complement—not obsolete—existing products. The Supermux 790 is no exception. The Supermux 790 permits networks to grow while protecting the investment in other Infotron products.
The Supermux 790 can also be expanded to provide port contention
and switching, permitting any 790 input to be connected to any
other compatible output. The contention capability improves service
by permitting users to contend for all ports. It also improves
efficiency by putting a large number of users in contention for
a fewer number of ports.
A single Supermux 790 will serve multiple CPUs, thus reducing
costs, increasing control and adding CPU selection to the services
available to users.
Data protection is inherent in the data transfer between Supermux 790s and other Infotron statistical multiplexers. Data is temporarily buffered while a Cyclic Redundancy Check (CRC) is performed. If errors are present, the receiving 790 issues an Automatic Request-for-Repetition (ARQ) and the data is retransmitted and rechecked. Depending on which Supermux models are communicating, the Supermux buffers can handle telephone line failures lasting up to ten seconds on a fully loaded 9600 bps line.
The Supermux 790 has the sophistication and the power to provide economical, reliable data routing and transmission in multinode networks. Performance of the transmission in multinode networks. Performance of the entire network can be monitored and controlled from the central site. From the console, an operator can reroute traffic, control all channel and link parameters, monitor any input and initiate comprehensive test and diagnostic routines to pinpoint problems—even at remote, unattended sites.
Supermux 790 networks may be configured to provide no less than four safeguards against loss of data due to telephone line irregularities or outages.
The Supermux 790 provides the operations manager with console
control of the entire network. Any high speed link and any channel
in the local 790b and in all remote 790, 480, 680 and 780 Supermux
units may be monitored and tested from a central location.
Channel parameters, including speeds, ABR convention, priority,
connect and disconnect criteria and individual control signals
may be reviewed and changed at any time. The operator can monitor,
interact with and busy out any channel, initiate local and remote
loopbacks, transmit test messages and actually measure channel
response time. Similarly, the operator can alter link parameters,
reroute traffic, initiate loopbacks and diagnose and pinpoint
problems.
The console may be any teletype-compatible device and console
control may be transferred to any 790 unit in the network or to
any remote location. Users requiring assistance can, in fact,
transfer control to Infotron headquarters in New Jersey.
The Supermux 790 also accumulates system statistics which provide
the quantitative date necessary to intelligently plan system expansion.
The system can provide hard copy reports on link and channel
utilization showing average and peak loads, buffer utilization
report and event summaries for the local 790 and all remote 790,
480, 680 and 780 units.
The Supermux 790 takes full advantage of many of the performance features of the Supermux 480, 680 and 780 units such as down-line loading, priority control and high performance channels.
Changes in system parameters initiated from the central 790 console are automatically down-line loaded to all affected Supermux 790, 480 and 680 multiplexers.
Supermux 790 users can increase throughput and improve CPU scheduling
with Infotron's unique priority control Every input may be assigned
priority or no priority for statistical multiplexing on the link
to remote 790 and 680 units. This capability minimizes delays
for important inputs and may also be used to advantage to maximize
output link utilization.
For example, time consuming RJE transmissions
normally scheduled for evening hours can share bandwidth during
the peak daytime hours without interfering with other traffic.
This is accomplished by giving the RJE input channels no priority
and all other channels priority.
Error protection is one of the many benefits of statistical multiplexing. However, some transmissions, such as IBM's BiSync, are inherently protected with their own checking routines. The 790's error checking can be inhibited for these inputs, thereby reducing overhead, conserving buffer storage and further increasing throughput. These high performance channels are statistically multiplexed with other 790 inputs.
Automatic Baud Recognition (ABR) permits the Supermux 790 to recognize the speed of dial-up inputs, eliminating the need for separate speed dedicated lines, computer ports and telephone rotaries. This optional feature is programmable on an individual channel basis for inputs using the "Carriage Return" or "Memorex" convention.
The Supermux 790 flow control option reduces CPU load and eliminates data loss for users of terminals with XOFF capabilities. The Supermux at the terminal end recognizes the command and immediately stops the flow of data to the terminal. It will, however, permit the CPU to continue sending, generating its own XOFF message only if the buffer reaches 80% of capacity.
Controller Nest SM790/CN:
Includes central logic and reporting
and diagnostic module. Houses up to eight Link Modules and seven
Dual Input/Output Interface Modules.
Input/Output Expansion Nest XN790/32R:
Includes input/output
controller logic. Houses up to sixteen Dual Channel Adapters.
Maximum aggregate channel input speed is 38,000 bps.
Dual Input/Output Interface Module CL790/DIM:
Used in Controller
Nest to interface with Input/Output Expansion nests. Supports
two Input/Output Expansion Nests.
Power Supply PS790/15R:
One power supply is required for
each nest.
Used in Controller Nest to communicate with a remote Supermux 480 or a remote Supermux 790 equipped with another Supermux 480 Link Module. Supports up to eight channels, link speeds to 9600 bps.
Used to communicate with a remote Supermux 680 or a remote Supermux 790 equipped with another Supermux 680 Link Module. Supports up to 32 channels, link speeds to 9600 bps.
Used to communicate with a remote Supermux 780 or a remote Supermux 790 equipped with another Supermux 780 Link Module. Supports up to 128 channels, link speeds to 19,200 bps.
Used to communicate with a remote Supermux 790 equipped with another Supermux 790E Link Module. Supports up to 128 channels, link speeds to 19,200 bps.
Used to communicate with a remote Supermux 790 equipped with another Supermux 790V Link Module. Supports up to 256 channels, link speeds to 72,000 bps.
Used in Input/Out Expansion Nest to accommodate two full-duplex, dial-up or dedicated, asynchronous input lines at speeds from 50 to 9600 bps. Normally used with Bell or equivalent 103, 113, 202D and 212 type data sets or with direct connect terminals.
Used in Input/Output Expansion Nest to accommodate two half-duplex, dial-up, dedicated or multidropped polled input lines at speeds from 1200 to 9600 bps. May be used with inputs employing IBM's BiSync protocols including 2780, 3780, 3270 and 360/20 HASP multileaving and with CDC's UT-200.
The current interface adapters plug into external connectors on the Supermux 790 and may be added on an individual line basis to any asynchronous input. The electrically isolated and polarity insensitive adapters interface with systems using 20 or 60 milliamp, neutral current.
The polar interface adapter is similar to the current interface adapter above except that it is for use in + 60 volt, 60 milliamp applications.
| Type: | Statistical |
| Inputs: | |
| Number of Channels: | Up to 448 |
| Speeds (asynchronous): | 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600 bps |
| Speeds, ABR: | Carriage Return: 110, 134.5(9), 300, 300(9),
1200 bps
Memorex: 110, 134.5(9), 150, 300, 300(9), 1200 bps |
| Speeds (synchronous): | 1200, 1800, 2000, 2400, 3600, 4800, 7200, 9600 bps |
| Codes: | 5, 6, 7 or 8 data bits, Baudot, ASCII, IBM |
| Interface: | EIA RS232C/CCITT V.24/V.28, Female 25 pin (DB-25-P), 20 or 60 milliamp current |
| Maximum aggregate: | 38,400 bps input data rate per expansion nest |
| Outputs: | |
| Number of links: | Up to 8 |
| Speeds: | Up to 72,000 bps synchronous |
| Protocol: | Similar to SDLC and CCITT X.25 Level 2 framing: flag, zero insertion and 16 bit CRC; variable block length |
| Error Correction: | ARQ (Automatic Request-for-Repetition) |
| Interface: | EIA RS232C/CCITT V.24/V.28/V.35, Female 25 pin (DB-25-P) |
| Controller Nest Width: Height: Depth: |
19" (48.3 cm) 13.25" (33.7 cm) 12.25" (31.1 cm) |
| Weight: | 35 pounds |
| Expansion Nest Width: Depth: Height: |
19" (48.3 cm) 13.25" (33.7 cm) 8.75" (22.2 cm) |
| Weight: | 30 pounds |
| Power Supply Nest (Accommodates up to 3 supplies) Width: Depth: Height: |
19" (48.3 cm) 16" (40.6 cm) 5.25" (13.3 cm) |
| Weight: | 35 pounds |
| Power Requirements: | 117 VAC + 10%; 57 to 63 Hz 230 VAC + 10%; 45 to 55 Hz 300 watts per Controller Nest 200 watts per Expansion Nest |
| Temperature, operating: | 0° to 35° C, 32° to 95° F |
| Temperature, non-operating: | -25° to 50° C, -13° to 122° F |
| Humidity: | 0% to 95% relative, non-condensing |
All Infotron products are engineered and manufacture to the highest
standards and carry a one year factory warranty. The warranty
covers all parts and labor. In addition, domestic customers may
choose from three service plans—a Fixed-Price contract providing
on-site coverage at a fixed monthly fee, an On-Call arrangement
where on-side service is billed on a per call basis and our Out-of-Warranty
factory service plan.
Customers in Europe are supported by Infotron Systems Limited,
our subsidiary in England. With its own engineering, manufacturing,
sales and service facilities, Infotron Systems Limited extends
Infotron's capabilities to Austria, Belgium, Denmark, England,
Finland, France, Italy, the Netherlands, Norway, Portugal, Sweden,
Switzerland and West Germany.
