Telos Zephyr Xstream User Manual page 236

The V.35 Split works the same way as the V.35 mode on the Zephyr classic. The
same Inverse Multiplexing (IMUX) method will be used as if the Interface were
set to ISDN. The codec selections in V.35 Split are also the same as for ISDN.
Note that the line status words on the default Tel menus have different
meanings when V.35 is selected (see above). See Appendix 6 (Special
Operational Modes) for more information.
V.35 Single
This selection will enable the Xstream's built‐in V.35/X.21 interface, if present.
Section 9 (V.35/X.21) has more details on the operation of the V.35 interface.
In Single V.35 mode a single MPEG compliant bitstream is generated and
output over both V.35 ports. Note that the Line status words on the default
menu and the Tel menu have different meanings when V.35 is selected. See
Appendix 6 (Special Operational Modes) for more information.
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IMPORTANT!
The following selections in the CODEC menu will have different options when the Interface
is set to V.35 Single.
• Transmit
• Receive
• Bit Rate
See Appendix 7 (Special Operational Modes) for additional Information.
This selection adds additional flexibility to the Xstream. For example, a single
128 kbps dedicated synchronous circuit could be used instead of two 64 kbps
circuits.
This also allows transmission of audio at 128 kbps and higher (up to 384 for
Layer 2 and AAC, and up to 256kbps for Layer 3). Operating at such reduced
compression ratios give maximum "coding headroom" for further perceptual
coding cycles elsewhere the transmission chain. And, ITU "indistinguishable
quality" audio is achieved with many of the coding algorithms at the higher bit
rates.
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ZEPHYR CLASSIC VS XSTREAM COMPARISON!
The Zephyr classic's V.35 interface supports only the V.35 Split mode of operation.
You asked for the ability to send a single 112 or 128 kbps bit stream. The Xstream offers this
via the V.35 Single mode, as well as rates up to 384 kbps for use when quality is critical, or
multiple coding cycles are anticipated.
USER'S MANUAL
Section 11: THE WORKS – Detailed Menu Reference 224