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V5.1 only supports the Control, PSTN and ISDN protocols. V5.2 also supports BCC, Link Control and Protection protocols. V5 layer 3 protocols are transported on a layer 2 protocol called LAPV5, a variation of the LAP-D or Link Access Procedures, D channel ISDN transport layer. V5 is a protocol stack which controls circuit-switched communication ...
Processor diagnostics would generally narrow a problem down to a board or three. Connection was made via a crossbar switch. A SP1 2-wire variant was also available that provided Centrex services. A version of the SP-1 ESS that could provide both 2 & 4 wire services was also built. The first instance was installed in Vegreville Alberta in 1976 ...
A data link connection identifier (DLCI) is a Frame Relay 10-bit-wide link-local virtual circuit identifier used to assign frames to a specific PVC or SVC. Frame Relay networks use DLCIs to statistically multiplex frames. DLCIs are preloaded into each switch and act as road signs to the traveling frames. [1] The standard allows the existence of ...
ASME Y14.44-2008 continues the convention of Plug P and Jack J when assigning references for electrical connectors in assemblies where a J (or jack) is the more fixed and P (or plug) is the less fixed of a connector pair, without regard to the gender of the connector contacts.
The de facto standard for 3.5 inch drives uses a 34-pin header mating to an IDC Berg connector, collectively slightly smaller than the PCB edge pin connector and mating socket used for the 5¼ inch standard but with the same 34 pin definitions as the 5¼ inch standard. [7]
Two-wire circuits in new installations are limited to intercom and military field telephone applications, though these too are being supplanted by modern digital communication modes. To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office .
The signaling unit is the special modem that converts the DC signaling protocol into tones that could be transmitted over a four-wire link back to the PTT exchange. The signaling unit and trunk circuit communicate their status over the E and M leads, using a combination of battery and earth (also known as ground) levels.
The Cisco Supervisor Engine serves as the management card for modular Cisco switches that can also, in some cases, act as forwarding/routing element. [1]Over time, the Supervisor Engine has undergone multiple iterations and was different for different modular switches in Cisco Portfolio (Catalyst 4000, 4500, 5000, 5500, 6000, 6500, 9400, 9600 and Nexus switches).
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