F--
230Installation of KTUs
Note: The following KTUs cannot be inserted or removed with power on:
CPU-S | KSI-S | DPH-S | |
CLK-S | DCI-S | PBS-S | |
SWM-S | MFI-S | AHR-S | |
-_. | _... .._ .._ _._.- | .- | .__J |
230.1General Information
1.The KTUs specified directly above cannot be inserted
or removed -with power on. It is recommended that power be OFF during installation and during mainte- nance unless this will seriously inconvenience the user. This will prevent accidental damage to equipment.
The KTUs used in the Electra-616 system make ex- tensive use of CMOS technology. Care must be taken to avoid static discharge when handling these KTUs.
KTUs are provided with a guide slot to prevent mis- installation. KTU connectors are provided with a guide key. These guide keys must not be removed.
230.2Installing Basic MTUs
T 1DC1 -S and MFI -S KTUs
When installing DCI-S and MFI-S KTUs there may be more KTU circuits installed (since there are 3 per KTU) then will actually be used. Any non-used circuits should be programmed as “not installed” when pro- gramming for CO/PBX line assignment. See Section
300 “Programming” of this manual for instructions
on programming CO/PBX line assignment. This will avoid confusion when attempts to access unconnected CO/PBX lines are made. The DSI-S or MFI-S in the first designated KTU position (DCI/MFI 1) serve CO/ PBX lines 1 through 3. A DCI-S or MFI-S in the second designated KTU position (DCI/MFI 2) serve CO/PBX lines 4 through 6. Refer to figure 230-2 for KTU positions in the Key Service Unit. See AHR-S
KTU in Section 230 for information’on wiring change for providing Automatic Hold Release feature when AHR-S KTU is installed.
2.KS1 -S KTU
There are two designated KS1 KTU positions within the Key Service Unit. The KS1 -S in the first position (KS1 1) serves stations 1 through 8, while a KSI-S in the second position (KS1 2) serves stations 9 through
16.Located on each KS!-S KTU are 8 fuses which
are Smm by 20mm and are rated OSA 125V: one fuse for each keyset. The fuse provides protection on the data transmission pairs (DT and DR). When a fuse must be replaced refer to Section 140, “Fuse Replace- ment” of this manual.
3.SWM-SKTU
An SWM -S KTU must always be installed in SWM 1. An SWM-S KTU must be installed in SWM2 when either stations 9 - 16 and/or CO/PBX lines 4 - 6 are to be connected.
Table 230-I Installing SWM-S KTUs
SWM -S
WHEN
SLOT
/SWMl / For Stations 1 - 8 and CO/PEX lines 1 - 3.
SWM2 | For Stations 9 - 16 and/co CO/PBX lines 4 - 6. |
230.3 Installing &mmon KTUs
I.CPU-S STU
Before programming the Network Plan Memory (NPM), ensure that the SW1 switch located on the CPU-S KTU is set to the ON position. This will provide battery back-up for the NPM, speed dial, and last number dialed memories when power is lost to the KSU. If there is a power failure and switch is left in the OFF position, the system will lose the contents of memory and return to the Resident System Program. For a description of the Resident System Program see
Section 300 “Programming”. When the CPU-S KTU is removed for long-term storage, set the SW1 switch to the OFF position. This will prevent the battery from constantly discharging until it is no longer capable of holding a charge. The battery, when fully charged,
will protect the memory for approximately 60 days.
back-up to the Electra-616 system during a power I failure.
ON- -- OFF
SW1
Fig. 230-l CPU-S Switch for Volatile Memory
