Telos Zephyr Xstream - Manual (Page 173)

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.