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56
Optional equipment
10. Press each of the keys on the telephone and verify the operation using
the table of Keys and responses below.
Keys and responses
Key or action
Dial pad keys
Left side of volume key
Right side of volume key
Center of volume key
Rls (Release)
Hold
Handsfree
Indicator keys 1 to 11
Softkeys 1 to 4
Lift handset
Replace handset
Plug in headset
Unplug headset
11. When the test is over, press Exit several times to return to the idle
display.
Isolating transmission errors
A properly engineered digital transmission system provides a significant
improvement in bit error rates over an equivalent analog system. Multidrop
digital systems do, however, introduce some different sources for data
errors, if incorrectly engineered. The S/T-bus requirements are discussed in
the document ISDN S/T Bus and U Loop Engineering (NTPs 297-2451-
181 and 2972451-182), but error possibilities are briefly listed here for
reference:
•
Loop characteristics: out of specification (range, cable parameters)
•
NT1 configuration setting: different from loop arrangement
•
Wiring polarity: if wiring polarity reversed for at least one terminal on
multidrop loop
•
Incorrect loop termination (missing, faulty, wrong location)
•
Faulty terminal or line cord
M5317TX and CustomNet Installation Guide
Display
shows appropriate number
Vol Dn
Vol Up
Store V
Rls
Hold
HFMute and key indictor turns ON
Hard and key indictor turns ON
Soft1 to Soft4
OffHk
OnHk
Seat
Unseat
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