CE3 Interface 119Follow these steps to start/stop a BERT test on a T1-F interface:Displaying andMaintaining T1-FInterfacesCE3 InterfaceOverview Like E1, E3 also belongs to the digital carrier system of ITU-T. It transmits data at34.368 Mbps and adopts HDB3 as the line code format.A CE3 interface can work in either E3 or CE3 (the default) mode.■ A CE3 interface in E3 mode equals an interface with 34.368 Mbps databandwidth, on which, no timeslots are divided.■ A CE3 interface in CE3 mode can demultiplex 16 channels of E1 signals incompliance with ITU-T G.751 and G.742. Each E1 line can be divided into 32timeslots numbered 0 to 31, of which timeslots 1 through 31 can be randomlybundled into N × 64 kbps logical channels. (Timeslot 0 for framing signaltransmission must not participate in bundling operation.) Therefore, CE3 canbe channelized into E1 lines or CE1 lines.When an E1 line is working in unframed (E1) mode, the system automaticallycreates a serial interface numbered serial number/line-number:0 for it. Thisinterface operates at 2048 kbps and is logically equivalent to a synchronous serialinterface where you can make other configurations.When the E1 line is working in framed (CE1) mode, you can bundle timeslots on it.The system automatically creates a serial interface numbered serialnumber/line-number:set-number for it. This interface operates at N × 64 kbps andis logically equivalent to a synchronous serial interface where you can make otherconfigurations.CE3 interfaces support link layer protocols PPP, HDLC, FR, LAPB, and X.25 andnetwork protocols IP and IPX.Configuring a CE3Interface (in E3 Mode)Follow these steps to configure a CE3 interface operating in E3 mode:To do... Use the command... RemarksEnter system view system-view --Enter CT1/PRI interface view interface serial interface-number --Start a BERT test ft1 bert pattern { 2^20 | 2^15 } timeminutes [ unframed ]RequiredTo do... Use the command... RemarksDisplay information about aspecified or all T1-F interfacesdisplay ft1 [ serial serial-number ] Available in anyviewDisplay the operating state of aspecified T1-F interfacedisplay interface serialserial-numberAvailable in anyviewTo do... Use the command... RemarksEnter system view system-view --
