Section 365-001-201
7
7.
OPTIONS
The following paragraphs describe the connecting jacks, push-on jumper options, and screw options that are
used to condition the 3650–01/03 for proper application and operation. Also refer to Figure 4 for an illustration of
the connecting jack and option locations and to Table 2 for a brief summary of the option conditioning require-
ments.
Note:
When opening a screw option, rotate the screw counterclockwise two full turns to ensure that the connec-
tion is open. When closing a screw option, rotate the screw clockwise until it seats. When selecting the
push-on jumper options, push the jumper over the appropriate pins with that option grouping to obtain the
desired operation.
7.1
Post-Equalization (J2)
A Charles Industries 3691–00 Nonloaded Cable Equalizer Subassembly or 3691–01 H88 Loaded Cable Equalizer
Subassembly can be ordered separately to provide post-equalization (transmit path) when inserted into jack J2.
Additional information about the equalizer is available in the 3691–XX documentation.
7.2
Comp Net/PBN—Hybrid Balancing (J3)
A Charles Industries 3690–00/10, –01/11, –02/12, or –03/13 BPN Subassembly can be ordered separately and
inserted into jack J3 to provide hybrid balancing. Refer to the 3690–XX documentation for more information.
7.3
Pre-Equalization (J4)
A Charles Industries 3691–00 Nonloaded Cable Equalizer subassembly or 3691–01 H88 Loaded Cable Equalizer
subassembly can be ordered separately to provide pre-equalization (received path) when inserted into jack J4.
Refer to the 3691–00/01 document for additional information.
7.4
XMT Attenuation (push-on jumpers)
Eight push-on jumpers select up to 16.5 dB attenuation in 0.1 dB increments for adjusting the transmit path to the
proper operating level. By placing each jumper (0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8 dB) to the IN position, as required, a
level of +5.2 dBm at the TX and TXR test points can be achieved. Placing all of the jumpers in the OUT position
results in 0 dB attenuation.
7.5
RCV Attenuation (push-on jumpers)
Eight push-on jumpers select up to 16.5 dB attenuation in 0.1 dB increments for adjusting the receive path to the
proper operating level. By placing each jumper (0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8 dB) to the IN position, as required, the
desired output level can be achieved. Placing all of the jumpers in the OUT position results in 0 dB attenuation.
7.6
Hybrid Balance (Screw Option A)
The 3650–01/03 can accept an internal PBN or BOC via connector J3 or an external PBN or BOC via pins 46 and
41 (PN1 and PN2 respectively). Open option A to condition the unit to use an optional PBN or OBC. Closing op-
tion A when an optional PBN or BOC is not being used selects the on-board compromise network of 900/600
ohms in series with 2.15 uF.
7.7
Sealing Current (screw options AC, BC, JC)
Sealing current is a direct current that prevents contact deterioration, reducing poor-contact noise in non-soldered
cable splices. It is used on metallic lines carrying data, carrier, or other services employing low-level AC signals
not superimposed on a direct current. Sealing currents can be provided externally or internally (from the channel
unit); it can also be looped back when the distant end provides the sealing current source.
Sealing current is provided externally (customer supplied Charles Industries 8491–00 or equivalent connected to
pins 7 and 8) on the A and B leads by opening screws JC, AC, and BC. Use these settings also if sealing current
is NOT used on the metallic facility. When sealing current is provided from the far end of the 2W metallic facility,
close screw JC (to complete the loop) and open screws AC and BC. To use the on-board source of –48VDC seal-
ing current, open screw JC and close screws AC and BC.
7.8
Lead-Conditioning (screw option Y)
During an alarm, trunk processing is implemented on the 1 and 2 leads (pins 2 and 6, respectively) to the interfac-
ing trunk or switching system as follows: busy condition immediately upon an alarm, with a 70-millisecond wink
idle occurring 2.5 seconds after the alarm.
