Section 365–361–206
8
7.3
Wire Jumpers XC and YC ( 7 5/6-Bit or 8-Bit Encoding and Decoding)
Jumpers XC (transmit) and YC (receive) control the encoding and decoding scheme for the transmit and receive
paths to/from the facility and must be set to the same position for each direction. For a 7 5/6-bit encoding/decod-
ing scheme which provides the transmission of a constant busy signal to the far end and for end-to-end compati-
bility with E&M channel units, leave the jumper wires, XC and YC, in place. For a full 8-bit encoding/decoding
scheme which provides a greater signal-to-noise ratio than the 7 5/6-bit scheme and does not transmit a busy
signal to the far end, cut jumper wires XC and YC.
Note:
If the encoding and decoding scheme cannot be determined, then choose the 7 5/6-bit scheme by leaving
the XC and YC jumper wires intact.
Note:
When cutting the jumper wires, be sure to clip the jumper at each pad to completely remove the wire.
8.
ALIGNMENT
The XMT GAIN switches (half of S4 and S5) are prescription controls that provide gain from zero to +32.5dB in
increments of 0.1dB to accommodate an input TLP range from +10 to –22.5dBm. To adjust the transmit path to
the proper operation level, the difference b10 and the transmit TLP at T&R must be obtained:
[XMT GAIN = 10 – TLP]
For an input TLP of –2.0dBm, the XMT GAIN = 10 – (–2) = 12dB. Set the sum of the XMT switch settings on S4
and S5 to 12.
The RCV GAIN switches (half of S4 and S5) are prescription controls that provide gain from zero to +32.5dB in
increments of 0.1dB to accommodate an output TLP range from +10 to –22.5dBm. To adjust the receive path to
the proper operation level, the difference between –22.5 and the receive TLP at T1&R1 must be obtained:
[RCV GAIN = TLP – (–22.5)]
For an output TLP of –6.0dBm, the RCV GAIN = –6 – (–22.5) = 16.5dB. Set the sum of the RCV switch settings
on S4 and S5 to 16.5.
9.
TESTING
Once optioning is fnished, place a call end-to-end through the facility to verify proper operation. If trouble is en-
countered, recheck all installer connections, options and alignment settings, and verify that the channel unit is
making positive connection to the backplane connector. If trouble persists, replace the unit with a similar unit
known to be in proper operating order and retest the facility. Channel unit testing for fault diagnosis or verification
of circuit operation is provided in Section 360–001–205.
10.
TECHNICAL ASSISTANCE
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)
11.
WARRANTY & CUSTOMER SERVICE
11.1
Warranty
Charles Industries, Ltd. offers an industry-leading, 5-year warranty on products manufactured by Charles Indus-
tries. Contact your local Sales Representative at the address or telephone numbers below for warranty details.
The warranty provisions are subject to change without notice. The terms and conditions applicable to any specific
sale of product shall be defined in the resulting sales contract.
