Section 365-001-201
9
7.9
Full Bit Encoding/Decoding (screw options XC, YC)
Screw options XC and YC condition the channel unit for either full 8-bit encoding/decoding (no signaling) or 7 5/6
bit encoding/decoding (busy condition transmitted to far end). For full 8-bit decoding, open screw YC. For 7 5/6 bit
decoding, close screw YC. The 8-bit encoding and decoding provides a better signal-to-noise ratio than the 7 5/6
bit encoding and decoding.
8.
ALIGNMENT
8.1
Transmit Alignment
The XMT attenuation push-on jumpers provide attenuation from 0 to 16.5 dB in increments of 0.1 dB to accom-
modate an input TLP range from –9.5 to +7 dBm. To adjust the transmit path to the proper operating level, the
difference between –9.5 and the transmit TLP and tip and ing must be calculated.
[XMT ATTN = TLP–(–9.5)]
For an input TLP of 7 dBm, the XMT ATTN = 7–(–9.5) = 16.5 dB. Se the sum of the push-on jumpers to 16.5 (all
to the IN position).
8.2
Receive Alignment
The RCV attenuation push-on jumpers provide attenuation from 0 to 16.5 dB in increments of 0.1 dB to accom-
modate an output TLP range from +6 to –10.5 dBm. To adjust the receive path to the proper operating level, the
difference b6 and the receive TLP at T1 and R1 must be obtained.
[RCV ATTN = +6–TLP]
For an output TLP of –12.5 dBm, the RCV ATTN=+6–(–10.5) = 16.5 dB. Set the sum of the push-on jumpers to
16.5 (all to the IN position).
9.
TESTING
After mounting, installation, optioning and alignment, use the following steps to test the unit.
Step
Action
1.
Place a call end-to-end through the facility to verify proper operation.
2.
If trouble is encountered, re-check all installer connections, options and alignment settings and verify
that the channel unit is making positive connections to the backplane connector. Then re-test.
3.
If trouble persists, replace unit with a similar unit known to be in operating order and retest the facility.
Channel unit testing for fault diagnosis or verification of circuit operation is provided in section
360–001–20X.
10.
TECHNICAL ASSISTANCE
10.1
Technical Assistance — U.S.
If technical assistance is required, contact Charles Industries’ Technical Services Center at:
847–806–8500
847–806–8556 (FAX)
800–607–8500
[email protected] (e-mail)
10.2
Technical Assistance — Canada
Canadian customers contact:
905–821–7673 (Main Office)
905–821–3280 (FAX)
