Error Inject Keys (Quickbert-T1 Only); Send Loop Up/Down Keys (Quickbert-T1 Only); Rx Input Key - Fluke 635 User Manual

Overview
2
Controls
to the speaker (and headset jack). The DS0 channel selection (1-24) is shown
on the display that is located to the left of the CHANNEL UP/DOWN keys.
These keys are also used with Fractional T1 to select fractional channels.

2-40. ERROR INJECT Keys (QuickBERT-T1 only)

The three ERROR INJECT keys allow insertion of logic, BPV, or frame
errors into the data stream. When you press the ERROR INJECT key
momentarily, the LED will flash and one error will be injected. When you
press and hold the ERROR INJECT key for approximately two seconds, the
LED will illuminate solid and the selected error will be injected at an error rate
of 1.0E-4. Pressing the ERROR INJECT key again will discontinue the error
inject rate and turn the LED off.
2-41. SEND LOOP UP/DOWN Keys (QuickBERT-T1
only)
Various circuit elements in a T1 span respond to loop codes. This allows one
person to perform an out-of-service BERT. Press the SEND LOOP UP key to
transmit the loop-up code (which has been selected by the LOOP CODE key).
The SEND LOOP UP LED will illuminate to indicate the code is being
transmitted. Once the device is looped, the RECEIVE LOOP UP LED will
illuminate for approximately 3 seconds (5 seconds for HDSL loop codes) to
indicate that the device has successfully looped up. Press the SEND LOOP
DOWN key to transmit the loop-down code (which has been selected by the
LOOP CODE key). The SEND LOOP DOWN LED will illuminate to
indicate the code is being transmitted. The RECEIVE LOOP DOWN LED will
illuminate for approximately 3 seconds (5 seconds for HDSL loop codes) to
indicate that the device has successfully looped down. Table 2-1 lists all of the
loop-code types supported by the QuickBERT-T1. When monitoring a span, if
the QuickBERT-T1 detects a loop code, the RECEIVE LOOP UP LED will
illuminate to indicate a pre-loop condition.

2-42. RX INPUT Key

Before making a connection to the RX jack, the RX INPUT key should be set
appropriately. This key allows you to choose between three different T1
terminations: DSX MON for monitoring in-service or out-of-service lines
through a DSX Monitor jack; TERM typically for out-of-service testing; and
BRDG for monitoring in-service or out-of-service lines. The following
paragraphs describe each termination mode.
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