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> Avaya TN2185B 108267089 ISDN-BRI, 4-wire S/T-TE New
Avaya TN2185B 108267089 ISDN-BRI, 4-wire S/T-TE New
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TN2185B ISDN-BRI S/T-TE Interface (4-wire, 8 ports)
The TN2185B supports eight 4-wire ISDN BRI line S interfaces. Each interface operates at 192 Kbps, with two B-channels (64 Kbps) and one D-channel (16 Kbps). The TN2185B interfaces to the LAN bus and to the TDM bus to provide the TE side of the BRI interface.
The TN2185B is similar to the TN2198 except that the TN2185B is a 4-wire S-interface instead of a 2-wire U-interface. Another difference is the function of the SCOTCH/NPE and SAKI are replaced by the network control element (NCE). For each port, information communicates over two 64-Kbps bearer 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, or either of them may be packet switched, but not both at once. The D-channel is always packet switched. 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 packet switched channels support the LAPD protocol. However, the TN2185B does not terminate on LAPD protocol. The S-interface does not support switching of both B-channels together as a 128 Kbps wideband channel.
The TN2185B has a maximum range up to 18,000 feet (5486 m) from the system to the NT1 device. In a environment with multiple telephones, the B-channels are shared only on a per-call basis. For example, if the B2-channel is for data, then the use of the B2-channel by one telephone excludes the others from having access to it. When a used device communicates over the D-channel to access B1 or B2, that channel is owned until the call is taken down. The D-channel is always shared among the terminals. The TN2185B circuit pack can be used as an alternative to the TN464 circuit pack or the TN2464 circuit pack.
The ability of outpulse in-band DTMF signals or end-to end signaling is supported by the TN2185B.
QSIG Call Completion is supported, however, QSIG Supplementary Services are not. ISDN-BRI trunks can be used as inter-PBX tie lines that use the QSIG peer protocol.
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