A copy of the manufacturer's technical data sheet or system description manual -- Separately attached.

Provide a block diagram of the means for connecting the device to the telephone network and the means for connecting physically separated components. I think something like a diagram showing the cabling within a particular office would suffice.

The REN of the Etherphone is dominated by the REN of the attached telephone set when the Etherphone is in power-fail transfer mode (REN = 1.0A). The ring detector inside the Etherphone adds a small load which may need to be taken into account.

Exhibit D-1 is only needed if private line ports are involved. We don't have any

Type T -- The device is terminal equipment that performs network address signaling using tone-type signaling.

Not applicable since we do not use any private line ports.

The TeleWall connector contains the telephone and auxiliary leads. The Telephone connector attaches to the separately registered telephone instrument. All other connectors attach to non-registered equipment utilizing non-hazardous voltages.

TeleWall Connector (6 pin modular jack)
Pins 1, 6 -- not connected
Pins 2, 5 -- A and A1 auxiliary leads
Pins 3, 4 -- Tip and Ring telephone leads

Telephone Connector (8 pin unkeyed modular jack)
Pins 1, 8 -- Telephone set receiver drive, power-fail connected to Pins 2, 7
Pins 2, 7 -- Telephone set receiver, power-fail connected to Pins 1, 8
Pins 3, 6 -- Telephone set hookswitch, power-fail connected to A/A1 of telephone line
Pins 4, 5 -- Tip and Ring of the telephone set, power-fail connected to T/R of telephone line

Speaker Box Connector (8 pin keyed modular jack)
Pin 1 -- Volume control output
Pin 2 -- Volume control ground
Pin 3 -- Speaker hot
Pin 4 -- Speaker ground
Pin 5 -- Volume control input
Pin 6 -- Speaker box switch and LED ground
Pin 7 -- Speaker box switch
Pin 8 -- Speaker box LED

Microphone Connector (RCA jack)
Center -- Microphone preamp input, 600 ohm
Ring -- Ground

Line Out A Connector (RCA jack)
Center -- Line Out A output, approximate 1 volt p-p 1500 ohm source impedance
Ring -- Ground

Line Out B Connector (RCA jack)
Center -- Line Out B output, approximate 1 volt p-p 1500 ohm source impedance
Ring -- Ground

Line In A Connector (RCA jack)
Center -- Line In A input, approximate 1 volt p-p 10,000 ohm load impedance
Ring -- Ground

Line In B Connector (RCA jack)
Center -- Line In B output, approximate 1 volt p-p 10,000 ohm load impedance
Ring -- Ground

TTY Connector (DB-15S connector) Digital communications
Pin 1 -- Not connected

Pin 2 -- Transmit Data B
Pin 12 -- Receive Data B
Pin 5, 11 -- Ground

Pin 4 -- Transmit Data A
Pin 10 -- Receive Data A
Pin 3, 9 -- Ground

Pin 6 -- ManResetNC (reset button)
Pin 14 -- ManResetNO
Pin 13 -- Ground

Pin 8 -- ManResetNO (NMI button)
Pin 15 -- ManResetNC
Pin 9 -- Ground

Ethernet Connector (DB-25S connector) Digital communications
Pin 16 -- Receive Data
Pin 3 -- Ground

Pin 13 -- Transmit Data
Pin 25 -- Ground

Pin 11 -- Plus 5
Pin 23 -- Ground

Pin 12 -- Plus 12
Pin 24 -- Ground

Quality of CSl-8308 Voice Terminals is assured by 100% testing of each manufactured and repaired unit. A copy of the acceptance test procedures manual is attached. We do not have complete facilities for all FCC Part 68 tests.

We do not have complete facilities for all FCC Part 68 tests. We will make arrangements with a properly equipped laboratory for testing each manufacturing log for compliance with Part 68.

Exhibit G, consisting of both the description of the applican't quality assurance program abnd the Part 68 compliance program should be signed as approved by the applicant's quality assurance manager or other responsible officer.

Supplemental protection apparently refers to devices like the gas-tube surge suppressors we are using between tip, ring, and ground and between A, A1, and ground. There is a useful note on page 22 of the instructions for form 730. The note recommends that supplemental protection devices not operate below 350 volts. The key section reads "Note that the network interface dielectrics should be rated at 1000 volts; however, this rating can be reduced to 500 volts if suitable protectors are connected tip-to-ring; tip-to-ground; and ring-to-ground.

On another aspect of this. I telephoned our consultant and said that we had 350 volt surge suppressors connected between tip, ring, and ground. How did that square with the leakage current requirements of 68.304 that would connect 1000 vrms between tip, ring, and ground? He answered that the surge suppressors would need to be disconnected during the leakage tests.

I am left with residual confusion. Why should it be ok to have 500 v insulation when the device that is protecting the insulation is removed during the insulation test?

There is a remark on page 14 of the instructions for form 730 describing required specifications for components. "Relays, transformers ... capable of developing leakage . . . must have a breakdown rating of at least 1000 volts. (There is no breakdown voltage rating required for open circuit relay contacts.)" After a discussion with our consultant, I take this to mean that the FCC was considering loop-start relays such as our OH relay that act to connect tip and ring to the holding coil and signal coupling transformer. Since surge tests are performed in both the off and on-hook conditions, the dielectric of the open circuit relay contacts does not play a role in determining the part 68 accepability of the design.

In our system, we use a relay as a "power fail line transfer" device. When power is off (or the software fails), the Revert relay drops out and connects the telephone set directly to tip and ring. When the relay is active, the telephone set is instead connected to analog circuitry on the non-registered side of the Etherphone. (Indeed, the loop current for the telephone set in this mode is supplied nearly directly by the power supply secondary circuits.) In this design, the open circuit relay contacts form part of the dielectric barrier between the telephone system and the internal circuitry of the Etherphone. These contacts will be subjected to the 1000 vrms leakage tests of part 68.304. How does this square with the comment above about 500 v insulation in the presence of the protector?