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COMSPHERE 3800 Series Modems
Glossary-8 November 1996 3810-A2-GB30-20
register A part of the modem’s memory that contains values that determine the modem’s
operating characteristics.
Remote A branch of the Top-Level menu that permits access to the DCP of another modem.
remote loopback
A test that sends a signal to the remote modem to test the local modem, the remote
modem, and the circuit between them.
remote mode indicator
An inverse video that indicates the modems are operating in Remote mode.
result code
An asynchronous message (in either numbers or words) that the modem sends to the
DTE after executing or trying to execute a command.
Return to Dial
A function available when in Dial Backup mode that allows the modem to switch to
dial-line operation when currently on leased lines.
RJ11 A type of 6-position jack normally used with permissive dial networks and telephone
sets.
RJ21 A type of 50-position jack normally used with permissive dial networks providing the
appropriate conductors for up to eight telephone lines.
RJ27 A type of 50-position jack normally used with programmable dial networks providing
the appropriate conductors for up to eight telephone lines.
RJ45 A type of 8-position jack normally used with programmable dial networks.
rotary A TELCO service whereby multiple lines to a customer premise share a common
telephone number.
SDCP Shared Diagnostic Control Panel. An optional user interface similar to the front panel of
a Model 3810 or 3820 modem that attaches to the front of a COMSPHERE 3000 Series
Carrier. Installed at eye level into one COMSPHERE 3000 Series Carrier, it controls and
monitors modems in all the carriers in the cabinet. A single SDCP can control up to 8
carriers, with a total of 128 modems.
SDU Shared Diagnostic Unit. A circuit card installed in Slot 0 of the COMSPHERE 3000
Series Carrier that provides an interface between an optional SDCP and/or network
management and Model 381
1 modems.
Select key
An SDCP key that allows the selection of a specific card slot in the COMSPHERE
3000 Series Carrier.
serial transmission
A way of transmitting data in which bits are sent sequentially one at a time.
Shared Diagnostic Unit
(SDU)
A circuit card that plugs into a dedicated slot in the COMSPHERE 3000 Series Carrier to
provide the SDCP and network management interfaces to the dial modems in the carrier.
It translates the network management protocol to the devices in the carrier and routes
incoming messages to the appropriate slots.
S-registers Internal storage areas that contain information affecting the modem parameters.
Sync Dial A factory preset configuration area containing configuration options most often used in
synchronous dial networks.