COMSPHERE DualFlow Data Service Units
A data network circuit with one control and one tributary. | |
rate adaption | Used when the DSU or DBM operates at a speed greater than the DTE. This |
| capability is enabled automatically when the port speed is set lower than the line |
| speed. |
router | A device that makes decisions about the paths network traffic should take and |
| forwards that traffic to its destination. A router helps achieve interoperability and |
| connectivity between different vendor's equipment, regardless of the protocols |
| used. |
RTS | The state of the |
RXD | The state of the Received Data lead (V.24 circuit 104). |
session disruptive | Application data may be disrupted when running a test, or running the test may |
| cause the application session to be dropped or terminated. The result depends upon |
| the |
Diagnostic messages with a duration of .5 seconds or less that are sent over the | |
diagnostics | primary data channel. These messages may interrupt customer data, causing errors |
| requiring retransmission of data blocks. They should not, however, cause |
| termination of the communication session. |
Shared Diagnostic | A feature that allows |
Control Panel | Installed on one COMSPHERE 3000 Series Carrier, it controls and monitors the |
(SDCP) | DSUs in all the carriers in the cabinet. |
Shared Diagnostic Unit | A circuit card that plugs into a dedicated slot (slot 0) in the COMSPHERE 3000 |
(SDU) | Series Carrier to provide the shared diagnostic control panel (SDCP) and network |
| management interfaces to the DSUs in the carrier. It translates the network |
| management protocol to the devices in the carrier and routes incoming messages to |
| the appropriate slots. |
standalone | The Model 3615 DualFlow DSU that is designed for desktop operation. A |
| standalone DSU can be configured as either a control or a tributary. |
Switched 56 kbps | A service provided by local exchange and interexchange carriers (LECs and IECs) |
digital service | that allow customers to use |
| having to subscribe to private network services. |
Switched mode | Used in networks containing only DualFlow DSUs, it is a mode of operation using |
| control mode idle (CMI) and data mode idle (DMI) signaling in order to ensure |
| protocol independence of primary data while trapping diagnostic data in the DSU. |
training | The process of negotiating a communication rate between V.32 modems during call |
| setup. |
tributary | A DSU or DBM that is, for diagnostic purposes, at a logically subsidiary level in a |
| hierarchical network. Tributary DSUs in a network receive data from the control |
| DSU, as well as from any network management system present in the network. |
TXD | The state of the Transmitted Data lead (V.24 circuit 103). |
December 1996 |
