Toshiba Strata AirLink DK40i, Руководство по установке и обслуживанию

Страница: 376 / 724

Universal Slot PCBs
PCB Chapter Layout
9-32
Strata DK I&M 6/00
RCOU, RCOS – Four-Circuit Loop Start CO Line
Interface Unit
System:
RCOU–DK40Expansion KSU, DK424, DK424i
RCOS–DK40i, DK424, DK424i
Circuits per PCB:
four loop start CO line circuits
Interfaces with:
loop start lines
Older Version(s):
PCOU2 (does not have ABR circuitry, uses RCTU, K4RCU ABR circuits)
PCOU1(has ABR circuitry, identical and interchangeable w/PCOU2)
The RCOU also provides ring detection, dial outpulsing, and hold circuitry. Each RCOU line can
be programmed for DTMF or dial pulse signaling and gas tube secondary protection.
RCOU PCBs are shown in Figure 9-16 and described in Table 9-10 .
RCOS Installation (Internal Option)
An RCOS PCB can be installed on the RCOU of the DK40i, DK424 and DK424i for four more
loop start lines (for a total of eight lines–the RCOS circuits provide the same options as the
RCOU). Each RCOS circuit has gas tube secondary protection.
Excessive loudness which is caused by close proximity to a CO or PBX telephone can be fixed
through the RCOS and RCOU decibel (dB) PAD switches. RCOS dB switches SW501, SW601,
SW701, and SW801 and RCOU dB switches SW101, SW201, SW301, and SW401 provide a -3
dB signal level drop between the PBX and CO when set to position 3. Switches are factory-set at
the 0 (0 dB signal level drop) position.
See Figure 9-14 and Table 9-11 for RCOS controls, indicators, and interface connectors.
➤
To install an RCOS PCB
1. If the Strata DK system is within one mile of the PBX or CO, set the RCOS dB PAD switches
SW501, SW601, SW701, and SW801 to the 3 (-3 dB signal level drop) position. Set the
RCOU dB PAD switches to position 3 also.
Note
RCOU male connectors P11, P12, P13, and P14 are positioned to allow installation of the
RCOS only in the proper position.
2. Mate the RCOS female connectors J11, J12, J13, and J14 ( Figure 9-18 ) to the RCOU male
connectors P11, P12, P13, and P14 ( Figure 9-16 ).
3. Apply firm, even pressure to the RCOS to ensure proper mating of connectors.