Telos ZephyrExpress user manual Isdn TIP

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ISDN TIP!

Some long-distance connections donÕt support 64kbps. If ZephyrExpress wonÕt lock under these circumstances, both you and the distant site should change to 56kbps.

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— Sample Rate 32kHz or 48kHz. Codec sampling rates can be selected for Layer III (32kHz or 48kHz) and Layer II (48kHz only). Layer II can also operate at 24 kHz using the special L2 HALF/24 transmit and receive modes. Layer III provides 15kHz audio at 32kHz sampling and 20kHz audio at 48kHz sampling. 32kHz sampling is recommended for Layer III be- cause it results in fewer coding artifacts. You are in the best position to judge if the wider audio response of 48kHz sampling is appropriate for your application and you should feel free to experiment.

The sampling rate for G.722 (16kHz) is automatically configured by Zephyr.

COMPATIBILITY TIP!

If incoming audio sounds pitch-shifted, ZephyrExpressÕ sample rate doesnÕt agree with the distant studioÕs. Change it to match... or enjoy the effect.

— Compatibility Zephyr — Use this mode with most other modern codecs Dialog4 — This mode enables the a frame slipping/repetition feature to avoid occasional dropouts when receiving from most Dialog4 codecs

Slimline — This also enables the frame slip feature, and inverts the Layer 3 bitstream data to match Dialog4 Slimline codecs

—Ancill Data For future software options

—Status Out Selects the condition which activates pin 3 of the parallel port2: DecLock When decoder is locked

Line 1 When ISDN Line 1 connects Line 2 When ISDN Line 2 connects

Line 1&2 When both Lines 1 and 2 are connected Line 1or2 When either Line 1 or 2 connects

1Details on this feature are in Section 6, System Functions. Connection details are in Sec- tion 3, Hardware.

2See previous footnote.

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