Telos Zephyr Xstream, User Manual

Page: 173 / 381

USER’S MANUAL
Section 9: The V.35/X.21 Interface Option 161
V.35/ X.21
INTERFACE
(MINI-40 PIN)
Zep hyr™
Xstrea m
Line Port
Da ta Port
(V.35/ X.21)
T1/ E1 or other
CSU/ DSU
(112 kb p s or g rea ter)
To T1/ E1
or other
sync hronous
d a ta p a th
PORT1
(Xmt & Rc v)
PORT2
(d up lic a te signa l
ma y b e used to Xmt
to a sec ond site)
Single port operation supporting 112, 128, 256, or 384 kbps for operation on a single V.35/X.21 port.
The Interface Selection in the TEL menu should be set to" V.35 Single." The second port can be
used to send an identical audio stream to a second site if desired.
h
HOT TIP!
Layer 2 and AAC support operation at bit rates up to 384 kbps (4:1 compression ratio for
stereo). Layer 3 supports bit rates up to 256 kbps.
Split Operation using both ports
•
For two ‐ port operation using inverse multiplexing, two digital transmission
paths are required, so both the PORT 1 and PORT 2 plugs mate to the
TA/CSU digital connections. The TA/CSUs may be separate for each path, or
may be a single unit with two data ports. In Stereo and J ‐ stereo the system
automatically sorts out which channel is which and therefore it is irrelevant
which plug goes to which port. See below for when Mono/Dual modes are
used.
h
HOT TIP!
When troubleshooting configurations using V.35/X.21 split operation using both ports, keep
the following in mind:
• In L3 Dual/Mono Xmt mode channel A audio will be coded and sent out PORT 1 and
channel B audio will be coded and sent out PORT 2.
• If the receiving unit is put into L3 Dual/Mono Rcv mode it will be receiving from both ports
independently.
Therefore, by observing which audio channel experiences audio drop-outs, you can
determine where to look for problems.
By systematically switching cables, TA/CSUs, and lines, you will be able to isolate the
problem to a single line or piece of equipment, by seeing if the dropouts change channels as
equipment is swapped.
NOTE: Be sure to switch the units back to J-Stereo or Stereo operation once troubleshooting
is complete. The Dual mode does not match phase between the two channels, and is not
intended for stereo material.