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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 9: The V.35/X.21 Interface Option 161

V.35/X.21

INTERFACE

(

MINI-40 PIN

)

Ze p h y r™

Xstre a m

Lin e Po rt

Data Port

(V.35/ X.21)

T1/E1 or othe

r

C SU/ DSU

(112 kbps or greater)

To T1 / E1

or other

synchronous

data path

PO RT1

(Xmt & Rcv)

PO RT2

(duplicate signal

may be used to Xmt

to a se c 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wh

ich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.

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