JDS Uniphase HST-3000 Product Manual - page 2
Call Verification
The HST-3000 offers NT1/TE and LT modes for testing support at the customer
premises or switch. At the customer premises, a technician can verify BRI service
and SPID assignments by drawing dial tone. Service translations can then be
verified by placing and receiving calls on the U interface. Up to two simultaneous
calls can be made consisting of voice, 3.1k audio, 56k data, or 64k data calls. At the
CO, technicians can use the HST to verify cable pair assignments, identify line
sealing current and polarity, as well as to verify service translations prior to service
delivery. Manual or Auto SPID functionality gives technicians the flexibility to
manually configure the SPID or automatically assign SPID values for single or
dual calls. This allows for increased accuracy in testing and speeds service delivery
to the customer.
The HST-3000 provides prompting to the user for manual response (acceptance/
rejection) to incoming calls. It can also be set to automatically accept or reject
incoming calls. After a call has been accepted, the technician can either drop the
received B-channel data to the speaker or headset or BERT the call. BER testing
and a voice path, via a handset, is provided to qualify these data and voice calls.
In addition, the HST-3000 can be placed into LT or NT mode to send or respond
to EOC loop backs, providing a method of testing the 2B1Q BRI signal quality on
the BRI line. Testing in either mode, the user can then conduct BER testing on
either B-channel, both B-channels (2B) or the entire line (2B+D) using patterns
such as 2047. This test verifies the U interface.
Easy-to-read result views allow technicians to view ISDN statistics, call status,
BERT results, ISDN results, and D-channel decodes. A summary screen displays
“All Results OK” or a summary of errors. The unit presents Layer 1, 2, and 3
results, including plain English decodes of D-channel.
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HST-3000 ISDN BRI SIM
Figure 1. ISDN BRI testing