Penril Communications

Alliance/Datalink Modem Family

 North American:  ALX V.34M/33.6, V.32M/19.2, V.32M/14.4

International:  DLX V.34M/33.6, V.32M/19.2, V.32M/14.4

The Alliance / Datalink (ALX/DLX) family of modems are universal, multimode, mult-ispeed data and fax modems.  Alliance(North American version) and Datalink (International version) modems use high performance Digital Signal Processing technology to provide fast, flexible communications 33.6Kbps to 300bps with DTE speeds to 230Kbps, and support for 14.4Kbps fax traffic.  The ALX/DLX supports advanced features that maximize network uptime: multiple hardware versions to satisfy diverse installation requirements, rapid setup for both local and remote devices, continuous Data Terminal Equipment (DTE) and telephone line status reporting, and comprehensive diagnostics.


The ALX/DLX V.34 modem operates at speeds up to 33.6Kbps over the standard Public Switched Telephone Network (PSTN) in accordance with ITU-T V.34 recommendation and over 2- or 4-wire unconditioned leased lines.  Call setup is accommodated by either ITU-T V.8 or V.25 procedures.  Channel probing by the ALX/DLX V.34 automatically conditions the unit for maximum throughput and performance.  Asymmetrical connection data rates allow maximum throughput when channel directional characteristics differ.  The ALX/DLX V.34 provides fallback rates in accordance with the V.34 recommendation to accommodate channel limits: 33.6K, 31.2, 28.8K, 26.4K, 24.0K, 21.6K, 19.2K, 16.8K, 14.4K, 12.0K, 9600, 7200, 4800, 2400, 1200, 600, and 0-300 bits per second (bps).


The ALX/DLX V.34 will fall back to non-V.34 modes to connect with installed base V.32terbo, V.32bis, V.32, V.22bis, Bell 212A, V.22, V.21 and V.23 modems.  Also, the ALX/DLX family of modems support ITU-T V.13 for half-duplex simulation to work with those systems already configured for half-duplex modems.  The V.29 Fast Train (FT) mode is available for multidrop applications on all ALX/DLX modems.


The ALX/DLX modem family is compatible with Group 3, Class 1 and Class 2 fax and supports multiple modulation standards and speeds for fax transmission, including:

ITU-T V.17 at 14.4K, 12.0K, 9600 & 7200bps

ITU-T V.29 at 9600 & 7200bps

ITU-T V.27ter at 4800 & 2400bps

ITU-T V.21 channel 2 at 300bps for T.30

Integrated support for fax traffic means that the ALX/DLX family works with standard communications software packages to:

1)  Receive faxes on your computer and print faxes on a local plain paper printer.

2)  Send faxes directly from your computer, and

3)  Send data at rates up to 230.4Kbps.


The management software built into the ALX/DLX modem family is compatible with Penril Communications Series 6000 Network Management System.  The Series 6000 provides centralized configuration, status monitoring and diagnostic control over a network of ALX/DLX modems in any operating mode: dial-up line, leased line, or a combination of both.  The ALX/DLX reports the condition of the attached DTE port and telephone line to the network management console for easy detection and diagnosis of network faults.


The ALX/DLX supports automatic dial backup for leased line and dial applications.  For leased line applications, the ALX/DLX monitors the received carrier level and signal quality; in the event performance drops below the selected thresholds, the ALX/DLX will automatically establish a dial connection to the remote ALX/DLX.  Automatic lookback allows the communications path to be returned to the leased line when conditions permit.  In dial mode, the modem will redial the number stored in any selected memory cell in the event the connection is lost.


Automatic call origination is provided via an AT-compatible or ITU-T V.25bis-compliant autodialer.  The AT emulation mode allows the ALX/DLX to interface with a computer or device running intelligent communications software designed to drive an AT-style modem.  The V.25bis autodialer complies with asynchronous and synchronous international serial call origination standards.

V.42bis & MNP CLASS 5

The ALX/DLX family supports ITU-T V.42bis and MNP classes 1 though 5 to provide end-to-end error correction and data compression between modems equipped with V.42bis or MNP in the asynchronous operating mode.  Error correction is provided by V.42 and MNP classes 2-4.  Error correction and data compression is available in both dial and leased line operation.


Multiple levels of network security are provided by the ALX/DLX family of modems.  The ALX/DLX can be programmed to provide manual password protection (MPP) by calling back or passing through the incoming caller after password validation.  Automatic password protection (APP) can be used in the synchronous operating mode as well.  APP provides transparent security support by incorporating the password as part of the modem training process.  Additionally, the ALX/DLX can be programmed to call back the originator during the APP security process.


The ALX/DLX supports multiple methods of modem configuration.  The Liquid Crystal Display (LCD) and six front panel pushbuttons can configure the unit and alleviate the need for internal switches.  AT commands can be used to control configuration parameters through the DTE interface.  There is also a separate DIAG port through which configuration can be done from a dumb terminal or the Series 6000 Network Management System on both the local and remote modems.


Versatile diagnostics are supported for rapid problem isolation and uptime maximization.  ITU-T V.54 tests plus selftest can be initiated from the units front panel, via AT commands through the DTE interface or through the DIAG port.  The ALX/DLX modems support Analog Loopback (Loop 3), Analog Loopback Selftest, Analog Loopback Selftest with Errors, Remote Digital Loopback (Loop 2), and Remote Digital Loopback Selftest.  In addition to diagnostic tests, the ALX/DLX provides numerous status displays for monitoring the DTE interface and telephone line transmit and receive conditions.  The status information is displayed on the units front panel and is available remotely to minimize service calls to remote locations.



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Penril V.32 Modem Family