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T1/E1 port configuration task list 190IPLink Software Configuration Guide 16 • T1/E1 port configurationThe command has three other options that allow you to manually switch on/off different loops. All these addi-tional options are applicable in T1 and E1 mode.The ‘line-interface’ loop sends back the whole link bandwidth (2048kBit/s or 1544kBit/s).In ‘payload’ the entire user data bandwidth (1984 kbps or 1536 kbps) is looped back.For some tests it is helpful to loop back the system data. For example, system data are sent from the router tothe T1/E1 port. To switch on this feature the option ‘back-plane’ must be selected.Mode: port e1t1 Configuring T1/E1 encapsulationIn release R3.20 only ‘hdlc’ encapsulation is available on a T1/E1 port. Once encapsulation is configured as‘hdlc,’ the ‘hdlc’ submode can be entered for selecting the next encapsulation type like ppp or framerelay.Dependent on the port-type, the encapsulation ‘hdlc’ selects automatically all timeslots of the port for datatransmission (1-31 for e1 and 1-24 for t1).It is also possible to use the port in channelized mode. In “channelized” mode, the user selects less than thetotal number of timeslots for the channel (1-31 for E1, 1 – 24 for T1) is able to configure single or multipletimeslots for data transmission. To use this feature the encapsulation must be configured for ‘channelized;’afterwards the channel-group command is used to create the channel-group. In the channel-group configura-tion mode, the user selects the specific timeslots, and the encapsulation ‘hdlc’ will be available again. Once theencapsulation of a T1/E1 port is set to ‘channelized’ it is not possible to change the port-type again or to usethe ‘unframed’ framing format.Mode: port e1t1 Create a Channel-GroupIf the desired encapsulated channel uses only selected time slots (not the entire T1/E1), then it is necessary toset up a channel-group. To create a channel-group, set the T1/E1 port’s encapsulation to channelized. (See sec-tion “In T1 mode the E1/T1 interface module has the capability for autodetection of inband sent loopbackcodes. Once a loopback-up code is detected, the module automatically enables the proper loopback functionand disables it a soon as the corresponding loopback-down code appears. This feature is used by carrier equip-ment for testing the line to the customer. It sends the loopback-up code to the customer device, then subse-quently starts, for example, a Pseudo Random Bit Sequence (PRBS) to determinate the quality of theStep Command Purpose1 [ name] (prt-e1t1)[slot/port]#[no] loop-back{line-interface | back-plane | payload | auto-detection}Enables/Disables type of data loopback, line-inter-face, payload, back-plane, or auto-detection.Default: disabledStep Command Purpose1 [name] (prt-e1t1)[slot/port]#[no] encapsu-lation {channelized | hdlc}Specifies the encapsulation type of the T1/E1 port.Default: no encapsulation
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