CSL-8308 Registration To File Date October 18, 1983 From L. Stewart Location PARC Subject CSL-8308 Registration Organization CSL XEROX Release as /Indigo/Voice/Documentation/CSL-8308-Registration.tioga Came from /Indigo/Voice/Documentation/CSL-8308-Registration.tioga Last edited by L. Stewart, October 18, 1983 2:55 pm Abstract This document contains materials to be included with FCC Form 730 for the Part 68 registration application for the Etherphone. Item 1 -- Applicant's Name Xerox Corporation Palo Alto Research Center Computer Science Laboratory Item 2 -- Address 3333 Coyote Hill Road Palo Alto, CA 94304 Item 3 -- Party to receive registration grant Same as Item 1 Item 4 -- Manufacturer Same as Item 1 Item 5 -- Type of Filing Original long-form filing Item 6 -- Registration Classification Terminal Device Item 7 -- Type of Equipment MT -- Multifunction Telephone Item 8 -- Type of Applicant Manufacturer Item 9 -- Trade Names Our device is the CSL-8308 Voice Terminal Item 10 / Exhibit D -- Overall system description Brief description: "Provides communication in a user's location & over the telephone network." Part 1 A copy of the manufacturer's technical data sheet or system description manual -- Separately attached. Part 2 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. Item 11 -- Ringer equivalence number etc. a) Ringer Equivalence Number 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. b) Exhibit D-1 / Private line service Exhibit D-1 is only needed if private line ports are involved. We don't have any c) Network address signaling Type T -- The device is terminal equipment that performs network address signaling using tone-type signaling. d) Facility Interface Code Not applicable since we do not use any private line ports. Item 12 -- Standard Jacks RJ12C -- Bridged T/R ahead of the line circuit of a key telephone system with A/A1; 6 position jack. Conductors 1 and 6 reserved for telephone company use. RJ13C -- Bridged T/R behind the line circuit of a key telephone system with A/A1; 6 position jack. Conductors 1 and 6 reserved for telephone company use. Item 13 -- Technical exhibits Exhibit E -- Technical Specifications Exhibit E is separately attached. Exhibit F -- Equipment Evaluation Exhibit F will be provided by the consulting engineer. This section contains my thinking on the test configurations to be used by our registration test consultant. I want to understand exactly what is going to be done, so that I can think about anything that might need to be fixed beforehand. (This might save a go-around.) Terminals 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 Exhibit G -- Quality Standards 1) Quality Assurance Program 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. 2) Part 68 Continuing Compliance Program 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. 2) NOTE 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. Exhibit H -- Equipment Label Submit a drawing of the label to be affixed to the equipment. Complies with Part 68, FCC Rules FCC Registration Number: Ringer Equivalence: Manufactured by: Xerox PARC CSL Model: CSL-8308 Date of manufacture: Questions This section contains descriptions of matters I don't understand. Supplemental Protection 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? Relay ratings 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?