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The TN2198 circuit pack allows connection to the ANSI standard 2-wire U-Interface. In line-side BRI applications, connect an NT1 at the other end of the U-Interface. The NT1, in turn, connects to ISDN-BRI terminals. The TN2198 does not provide a trunk-side interface. The TN2198 contains 12 ports that interface at the ISDN U reference point. For each port, information is communicated over two 64 kbps channels called B1 and B2, and over a 16 kbps channel called the demand channel, or D channel. The D channel is used for signaling. Channels B1 and B2 can be circuit switched simultaneously, the D channel is always packet switched. The TN2198 requires a packet control circuit pack (TN778) on G3s and G3i. The circuit-switched connections have a Mu-Law or A-Law option (on a per-board basis) for voice operation and operate as 64 kbps clear channels when in the data mode. The D channel supports the LAPD protocol and is consistent with the CCITT Q.920 Recommendations for D channel signaling. The 2-wire interface from the TN2198 connects to an NT1 network interface. The 4-wire interface on the other side of the NT1 may have one or two telephones connected to it. In a multiple terminal environment, the B channels are shared only on a per-call basis. For example, if the B2 channel is used for data, then the use of B2 by one terminal excludes the others from having access to it. When a device communicates over the D channel to access B1 or B2, that channel is owned until the call is taken down (no party on line). The D channel is always shared among the terminals. The TN2198 circuit pack interfaces with the Time Division Multiplexing (TDM) bus and packet bus in the DEFINITY® backplane and terminates with 12 ISDN basic access ports. The TN2198 has a long range of up to 18,000 feet (maximum) from the PBX to the NT1 interface and uses standard protocol ANSI T1.601. The TN2198 has a 160 kbps line rate, consisting of two bearer channels (data and voice, B1 and B2) at 64 Kb channels each, the D channel at 16 Kb, framing at 12 Kb, and maintenance at 4 Kb. The circuit pack uses demand channel (ringing, tone, etc.), 16 kbps channel, and supports up to 24 telephones or data modules per circuit pack.
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- Features:
- The TN2198 allows connection to the ANSI standard 2-wire U-interface
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