• ISDN BA protocol analyser
• A standard notebook with Windows NT operating system
• PC-Card (PCMCIA) with external POD for connection to the ISDN Basic Access (2B + D) S-bus
• Software for protocol simulation (of terminal equipment)
• Software for protocol analysis (monitoring)
• Fully remote control (via split application)
• Optional script packages for interconnect testing

• Test instrument for ISDN Basic Access (2B + D)
• Software for protocol simulation:
  • Programmable terminal simulation layer 2, 3 and 6/7 (supplementary services)
  • Arbitrary manipulation of message content and order
• Software for protocol analysis (monitoring) supporting:
  • Complete decoding of layer 1, 2 and 3
  • Decoding of supplementary services
  • Full support for D/B channel X.25 and B-channel PPP (carrying IP/IPX)
• Handset included for call simulation and listening in on a B-channel

• A customer's ISDN-X.25 subscription does not work. Is the error on the terminal side or in the ISDN-net? What causes the error?
• An ISDN PBX or a plain ISDN NT1 has been installed. How can it be assured that the subscriber profile/services (line, packet and supplementary services) are available with required functionality?
• Interconnect testing: Automated ISDN end to end interconnect testing using optional script packages.
• An ISDN router set up to route both IP and IPX keeps setting up an ISDN connection to a remote site also when it should not. What kinds of IP or IPX packets are routed? How to monitor this remotely over a long period of time?

The simulator behaviour is controlled by means of a powerful and easy to use script language. The script language makes it possible to set up a required/desired (protocol/terminal) state, both normal and error states. There are no restrictions on neither format nor contents of the protocols transmitted or received. Arbitrary manipulation of messages, information elements and message sequence on the different protocols is allowed.

The scripts may be started in three different ways; keyboard input (by user), predefined date and time or event triggered/message triggered. The Windows NT based version supports two independently, simultaneously running simulators which gives the user the opportunity to simulate both ISDN line- and packet switched services in parallel.

Using the simulator over time, the user builds up different libraries of scripts. Examples of this is scripts for testing switch functionality, conformance testing, regression testing or interconnect testing.

The BA protocol analyser includes complete decoding of layer 1, 2, 3 and Supplementary Services. It also includes full support for both B and D-channel X.25 and B-channel PPP (carrying IP/IPX). The monitor analyses and decodes the signalling and displays it for the user in English. The degree of details is user controlled, from INFO frames on Layer 1 to detailed decoding of Supplementary Services on Layer 6/7 (ASN.1 decoding).

A monitored signalling sequence can be stored on hard disk either as screen dumps (ASCII) or binary files holding the complete detailed decoding. The stored information can be retrieved at any time using the same monitor. Continuous logging to hard disk under long time surveillance is also possible. Using the Windows NT-based Monitor, the log-file may be downloaded remotely using the Windows NT RAS function (connecting via ISDN, GSM or PSTN). The amount of information that can be collected is then only limited by the size of the hard disk. To find errors and signalling problems, it is possible to search for a text.

Some signalling know-how is required to understand and identify the information displayed during monitoring.

Together with our LAN protocol decoding solution, LAN-Mon, this instrument may also be used to do simultaneously decoding of protocols both sides of an ISDN router (i.e. LAN protocol analysis performed by the LAN-Mon application together with ISDN B- and D-channel decoding performed by the PIST-BA monitor application). For further information, please refer to the LAN-Mon description.

A telephony handset is included with the instrument. This is connected to a separate RJ11 connector in the external POD. In monitoring situations this handset can be used to listen in on any of the two B-channels. It can also be used when using the simulator for generating calls.

The simulator and monitor applications are both constructed to be used over a LAN/WAN access. The graphical user interface can be installed on one PC and the simulation or monitor "agent" run on another PC (notebook) connected to the test object. The WAN connection can be a standard mechanism such as RAS in Windows NT.

The ISDN BA applications support the following protocols:

• DSS1 Layer 1, INFO 0 to 4.
• DSS1 Layer 2 (Q.921/I.441).
• Euro-ISDN Layer 2, LAPD, LAPDE, LAPB, LAPBE.
• DSS1 Layer 3 (Q.931/I.451).
• Euro-ISDN Layer 3.
• X.25 (B- and D-channel, Layer 3).
• Layer 6 and 7, ASN.1 (Supplementary Services).
• PPP, IPX and IP in the B-channel.

• The instrument is recommended delivered with a notebook with Windows NT Workstation.
• One PC-Card with an external POD for connection to the S-bus is included.
• External telephony handset is included for listening in on a B-channel.