ISDN BRI Protocol Analyzer
U & ST Interface
Plain English Q.931 Decodes and Raw
Data is displayed on the screen
Two Audio outputs for bi-directional
Non-intrusive Transparent Operation
Click to enlarge
The PA 200 is an ISDN BRI protocol analyzer for
both U and ST interfaces.
Supports layers 1, 2, and 3 and provides decodes
to the screen of the PC. Packets are displayed as separate items in a list.
Activations and bit errors, as well as the content of any embedded operations
channel (ECO) messages, M-bits for U-Interface and S&Q bits for
ST-Interface, TEI assignments, SPID negotiations, B channel setup and other call
control operations are displayed. Detailed layer 1
messages plus layer 2 & 3 decodes and raw packet data permits rapid
troubleshooting for the experienced technician.
Data is collected from the D channel in both
directions and passed to the PC via the RS232 port. The ISDN data can be saved to
disk for analyzing at a later time.
The PA 200 connects in series with the Network
and User anywhere on the U interface or bridged to the ST interface. Data is
collected from the D channel in both directions and passed to the PC via the
RS232. The raw data is decoded per Q.931 and shown on the screen and can be
saved to disk for analyzing at a later time.
ISDN installers and troubleshooters typically use
the PA200 to resolve disputes between the phone company and the user. A
technician can be sent to the trouble site to capture data that can be sent to
an experienced technician or specialist for evaluation. ISDN equipment
developers use the unit for looking at real-time data in order to determine if
their equipment is performing according to specifications.
Audio jacks for B1 and B2 are provided on the
rear panel for on-site tests.
ANSI (US) or ETSI (European) ISDN BRI (Basic Rate
Interface) ISDN "U" 2B1Q interface (serial "in-line") via
Network and User RJ45 jacks. ISDN S/T interface (parallel "bridge",
hi-impedance, 20K ohms, capacitive input) RJ45. "U" and "ST"
interfaces cannot be used simultaneously.
Line bypass relay
In case of power failure or software
detected problem, the ISDN BG2 "U" interface is bypassed, the relay
providing a direct connection from the user to the central office. This is not
required with the S/T interface.
In the "U" interface mode, the PA 200
appears "transparent" to the line. It does not react to maintenance
codes, but passes them on to the other side. If the user side goes down the
network side goes down too. If the network (CO) side goes down, the user side
goes down. This most accurately mimics the operation of a normal ISDN line.
NOTE: This is not applicable to the S/T interface where the PA 200 is not
inserted "in-line" but makes a "bridged" connection.
The PA 200 may be placed in the ISDN "U"
loop at any position up to 18,000 feet on either side of the PA 200.
However for proper operation with line bypass relay, the total length should not
exceed the telco limit of the loop.
Sealing Current or Line Power
LED indication if "U" interface sealing current
or line power is present.
Two 600 ohm 3.5 mm jacks for bi-directional B1 and B2. Mono
audio out. U-Law / A-Law switch selectable.
Faceplate LEDs indicators
"U" or "ST" Interface
Network and User activation, sealing current and insertion / uninsertion.
U / ST selection, Mu-law/A-law selection,
B1 or B2 selection
PC Software provides time-stamped decoding
of layer 2 & 3 messages. Protocol analyzer software Windows 9x and above
Supports layers 1,2 and 3 per Q.921/Q.931.
Dimensions: 6.5 x 4.2 x 1.152 inches (165.10 mm x 106.68
mm x 29.26 mm)
Housing: Heavy-duty extruded aluminum. Aluminum end plates
Weight: 13 oz. approximately
9V DC @ 1 AMP wall
adapter (120V AC 60 Hz)
Included in the unit price
One year on parts and labor under normal use
Model: PA200-UST Includes:
unit, power adapter with US plug , RS232 cable, & two RJ45 cables