Interface > V-Series

This requires installation of the V-Series option.

Selecting V-Series from the Interface drop-down menu will launch the setup screen shown below.

Fig. 4.26 V-Series setup screen launched.

Selection Selection of the V-series type. Available types: None, RS-232/V.24 Async., RS-232/V.24 Sync., RS-449/V.36, RS-530, V.35, X.21/V11.

Mode Press the Operating Mode field menu and select mode type. In DCE and DTE mode the instrument will emulate either DCE or the DTE side. Main application will be either BERT or Frame Relay testing, with one trans-mitter and one receiver, alternative drop and/or insert to and from 2 Mbps. In this mode the instrument will monitor and generate the signals that are relevant in each mode. The timing is normally determined by the DCE.

In Monitor mode, all data and control lines from both sides will be mon-itored simultaneously and signaling recorded including Frame Relay monitoring. The instrument will not drive any signal and the measure-ment is non-intrusive.

The Drop mode is a special mode where signals from both directions are driven by the instrument. It is not relevant to connect the instrument to normal DCE or DTE equipment in this situation, but it provides a way of dropping signals to equipment that can receive in monitor mode. All

con-4.7 Interface > V-Series

umn it is possible to select whether the DCE/DTE emulation is: Receive Only, Transmit Only, Transceive, DCE & RxB-DTE and RxA-DTE & RxB-DCE. If operating as ‘drop’ it selects to which direction the 2 Mbit/s receivers are routed.

The setting of the Selection and Operation significantly effects which of the following parameters are available.

Bit Rate sets the bit rate of the interface: 50 - 115200, 8 kbps, 56 kbps, 64 kbps, 1024 kbps, 4928 kbps, 4992 kbps, Incoming, or Free.

From the adjacent drop-down menu it is possible to select multipliers be-tween 1 to 8 (8 kbps), 1 to 32 (56 kbps and 64 kbps) or bebe-tween 1 to 10 (1024 kbps).

When "Free" is selected, the adjacent field opens a setup screen by which it is possible to set the bit rate with 1 bps resolution, from 50 bps to the interface dependent maximum.

For RS-232/V.24 Async., the maximum bit rate is 128000 bps.

For RS-232/V.24 Sync., the maximum bit rate is 64000 bps.

For other interface types, the maximum bit rate is 10240000 bps.

Format DCE Transmit Clock (Transmit only), selects whether the DCE transmit clock is generated Internally or derived from an Incoming signal.

DTE Transmit Clock (Transmit only), selects if the DTE transmit clock is derived from an Incoming signal or generated Internally.

Asynchronous Format, selects the format (i.e. number of bits per charac-ter) of interfaces with asynchronous timing. Next column selects the for-mat (i.e. number of stop bits and parity) of interfaces with asynchronous timing.

X.21 X/B Signal (X.21 Interface only), selects how the X/B control signal should be used. With this parameter the user can select which clock edge from the incoming clock that is used to clock out transmitter data from the instrument. T normal is accordance with the X.21 recommenda-tion. If there are problems with high data rates on the X.21 interface, the T displaced should be selected instead.

Receiver Termination (X.21 Interface and receive only), When in DCE or DTE mode, this selects whether receiving signals are terminated or not.

For the RS-449, RS-530 and V.35 interfaces the receiver termination is always on when in DCE or DTE mode.

Pattern Pattern Type, enabling or disabling the generation and/or verification of a pattern. Choose between PRBS 6, 7, 9, 11, 12, 15, 20 or 23, or QRSS 11 or 20, or two user-defined patterns (16 bits or 2048 bits long), or 'Quick brown fox ..'-pattern or six fixed patterns (All 0's, All 1's, Alternat-ing 1:1, AlternatAlternat-ing 1:3, AlternatAlternat-ing 1:7 and AlternatAlternat-ing 3:24). Data may also be inserted into or dropped from the 2 Mbit/s interface.

The User Pattern [2048] is edited by pressing the button with the label

“2048/2048 Bits”.

Patterns (except All 0's, All 1's and “Fox”) may be Normal or Inverted.

User Pattern (16), settings for the user defined Pattern. The pattern length is 1 to 16 bits.

Errors Error Insertion (Transmit only), selection of the Error insertion rate. Error insertion can be “Off”, “Manually triggered” (by the ERROR key), “Peri-odically triggered”, or set to give a selectable Error Performance Event (ES or SES).

Error Destination: (Transmit only), selects the destination for Error Inser-tion.

Error Burst Length: (Transmit only), setting the Error Burst Length.

Max. length is 255.

4.7.1 Codirectional Interface

The CMA 3000 with the V-series interface option also supports the G.703 codirectional interface. The codirectional interface may be configured as either 1 transmitter - 1 receiver, or as 2 receivers. The latter is particularly suited for monitoring of CCS signalling links carried on a codirectional in-terface. It is also possible to transmit on the 2 Mbps interface and receive on the codirectional interface, or vice versa, for testing of demultiplexers and multiplexers.

The codirectional interface can be selected in line with the various V-se-ries interfaces. When the codirectional interface is selected, the ‘V-se-ries/Codir.’ screen will launch (see Fig. 4.27).

4.7 Interface > V-Series

Fig. 4.27 Codirectional interface screen.

Speed Bit rate, sets the interface bit rate: 64 to 512 kbps.

Codir. Transmitter Active, sets the transmitter On or Off.

Transmit Clock, selects Internal, RxA, RxB, or Incoming. RxA and RxB refers to the 2 Mbps receivers; Incoming refers to the codirectional re-ceiver.

Pattern type, selects the transmitted pattern.

User Pattern [16], sets the user defined 16 bit pattern. The pattern length is 1 to 16 bits.

Codir. Receiver Active, sets the receiver Off, On (1 receiver), or Dual Rx (2 receivers).

Pattern type, sets the transmitted pattern.

User Pattern [16], sets the user defined 16 bit pattern. The pattern length is 1 to 16 bits.

Errors Error Insertion (Transmit only), selection of the Error insertion rate. Error insertion can be “Off”, “Manually triggered” (by the ERROR key), “Peri-odically triggered”, or set to give a selectable Error Performance Event (ES or SES).

Error Destination: (Transmit only), selects the destination for Error Inser-tion.

Error Burst Length: (Transmit only), setting the Error Burst Length.

Max. length is 255.