ZyXEL Omni TA 128 User Guide - Page 66
Speeds of 128Kbps
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Speeds of 128Kbps BRI ISDN consists of three (2B+D) logical channels. Each B channel can be used independently for a dial-up connection running at 56Kbps or 64Kbps (bits per second). The two B channels can be used together for a single data connection to provide 112K (with In-Band Signaling) or 128K (when Out-of-Band Signaling is used). It is called a "Bundle Connection". The type of channel bundling described in the V.120 section is supported only between the following ZyXEL products: omni.net, Omni TA128, or Elite 2864I, and uses Multiple Link Protocol (MLP) and "cFos" channel bundling (CCB). Identifying your line provisioning For bundled connections, the two B channels of your ISDN line must be able to handle data circuit switch connections with unrestricted 64K or 56Kbps line speeds. Two separate data calls will be established consecutively. Making a Bundled Call with V.120 A bundled V.120 connection is initiated at the calling site when ATB20 (B channel protocol V.120) has been selected and the channel bundling mode has been enabled by an AT&J3 command. The channel bundling command (AT&J3) must be set on both the calling and receiving sides, otherwise a single channel connection will be made. Type: ATB20 (Set B channel protocol to V.120) AT&J3 (Set the TA128 to make a bundled call) Type: AT&WZ (If you want to save the setting) 54