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IDSL Testing
The IDSL Module offers an effective combination of features for IDSL and BRI ISDN testing, making circuit turn-up and troubleshooting simple. The emulation modes you need most are available to complete IDSL testing at the Central Office and at the customer premises. An external clock input ensures a stable BER measurement on IDSL circuits over Digital Loop Carrier
(DLC) system testing. The straightforward configuration and menu-driven operation simplifies the IDSL Module test functions.
Additionally, the IDSL module offers a broad range of crucial ISDN and X.25 over D-channel Basic Rate test capabilities, making circuit testing more productive.
Highlights
Equipped with the most needed test capabilities, the IDSL Module enables the field technician to efficiently perform circuit turn-up and troubleshoot testing for IDSL and BRI ISDN circuits.
- Turn-up or troubleshoot an IDSL circuit by running end-to-end BERT or single-ended BERT from the central office to the customer premises direction.
- Use external clock inputs to facilitate IDSL over DLC system testing to ensure valid BERT measurement.
- Test and monitor IDSL circuit status with the U interface eoc commands and M4 channel access capability provided by the IDSL Module.
- Turn-up ISDN circuits by making test calls and using the automated test capability.
- Troubleshoot ISDN circuits by monitoring the D channel messages and call disconnect cause value.
- Verify proper circuit functioning of X.25 over D channel by making test calls and sending data packets.
U and S/T Interfaces
The IDSL Module allows IDSL and ISDN BRI testing by providing both U and S/T test interfaces.
IDSL Testing
IDSL circuit testing generally requires both LT and NT emulation modes when testing from the Central Office and from the Customer Premises directions. The dual mode U-2B1Q interface supports both LT and NT emulation modes for U interface testing, supporting test requirements at either site. A BER test on a selected test channel allows transmission quality assessment of the IDSL circuit.
IDSL testing on the S/T interface is also supported through the availability of the S/T interface and the associated NT and TE emulation modes.
ISDN Testing
In consideration of ISDN circuit turn-up and maintenance testing requirements, the ISDN BRI emulation modes provide Layer 2 and Layer 3 testing with the TE/NT1 and TE-S/T emulation respectively for the U and S/T interfaces.
External Clock for IDSL Circuit over DLC Testing
Transmission quality BERT performed on IDSL circuits carried over Digital Loop Carrier
(DLC) systems is often impeded by intermittent pattern sync loss caused by clock slips. The IDSL Module provides external reference clock inputs to enable the test set to synchronize to the network to eliminate clock slip between the source from the test set and the circuit under test, ensuring a valid BER test result.
U Interface eoc Commands
Perform a loop BER test from the central office or co-locate site towards the span with the repeater or NT looped-up after sending an eoc loopback command. Verify if the NT is connected to the circuit by checking the response of the eoc command. Act as a loop box in NT mode responding to eoc loopback commands from the LT.
U Interface M4 Channel Access
The M4 channel provides useful information to the field technician about the circuit continuity to the DSLAM. The IDSL Module offers control and monitor of the M4 channel bit status.
Telephone Function
Telephone function for ISDN testing is supported through the use of microphone and loudspeaker on the SunSet
MTT unit. A handset interface is provided on the module for connection of an external handset to allow communication on two simultaneous calls.
ISDN Call Function
Supports most needed service types. Convenient B channel selection is provided for outgoing calls for testing of individual B channel. Automatic last number recall and speed dial numbers are available for easy access to last called and commonly used test numbers.
BERT Measurements
BER test analysis is in accordance with ITU-T Rec. G.821 to determine the performance of the end-to-end connection. BER test results can be stored in non-volatile memory.
Automated Tests
The ISDN automated tests are ideal for service provisioning to enable a quick verification of the services associated with and the performance of the line under test. Tests include Auto SPID for National ISDN, Guess SPID, Service Scan, Supplementary Service Scan, SELF-BERT, DUAL-BERT.
D-channel Packet Test
The X.25 over D-channel test function supports testing for SVC and PVC service. Data transmission is verified by sending pre-defined data packets. On screen indication confirms successful packet transmission making packet testing easy.
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