Telos TWOx12 - Page 211

TELOS TWOX12 USER’S MANUAL
GLOSSARY OF TELEPHONE TERMINOLOGY
APPENDIX 4 199
and can be received in L3 Mono using one B channel or L3 Stereo using 2 B channels.
Telos also maintains an identically configured testline in Freising, Germany at 49 81 61
42 061 (dial this number twice).
Terminal Adapter
- See TA
Tie Line
- See Tie Trunk.
Tie trunk
- A Trunk between two PBXs. Note, a tie line is a dedicated circuit, not a
switched circuit. See Trunk.
Trouble Ticket
-A Telco “work order” used to track Customer Repairs within the
Telco. If you call someone “inside” the Telco’s repair department they will need this
number to proceed. It will also be needed whenever you call to check on the status of a
repair. Always ask for this number when initiating a repair request.
Trunk
- A communications path between two switching systems. Note that many
trunks may be on a single circuit (if that circuit has multiple channels). The trunks most
users will deal with are between the Telco switch and a PBX. However a Tie Trunk can
connect two PBXs.
Trunk Group
- A number of telephone channels which are functionally related. Most
common is the Hunt Group. Other common types include Incoming Trunk Groups and
Outgoing trunk groups. See also Combination Trunks and Two-way DID Trunks.
Two-way DID trunk
- An ISDN PRI (or T-1) line equipped for direct inward dialing.
Most trunks are related to a given phone number, either alone or as part of a hunt
group. In the case of a “normal” (ie analog) DID Trunk a group of phone numbers are
associated with that DID trunk (or group of trunks) and incoming calls include the DID
number, so the PBX can route that call to the correct DID extension. This is exactly
how ISDN PRI functions, with the DID information coming in over the D channel.
There is a big difference between a normal DID Trunk and a Two-way DID trunk over
ISDN PRI. For one thing, ISDN PRI is digital. More importantly is that you cannot dial
out over a true DID trunk and you can dial out over a PRI.
Two Wire
– A circuit path where only a single pair of wires is used. A hybrid is used
to convert from two wire to four wire circuits. No hybrid is perfect, and those used by
the phone company can be pretty bad. But the Telos TWO family is approaching
perfection!
U Interface
- The interface between the ISDN “BRI” line and the “NT1”. This can be
considered the ISDN “phone jack” in the USA & Canada and is frequently in the form
of a RJ-11 or RJ-45 type telephone jack.
V.35
- A serial data interface/connector pin out for synchronous data. V.35 uses
balanced signal and data lines. The Zephyr models 9201, 9200, 9101, and 9100
support V.35 using part #9812 cable.
Virtual ISDN
- An alternative to repeaters which uses a local Telco Switch to act as a
repeater and which then sends the signal onto another switch which supports ISDN.
See also Repeater.
Work Order
- See Trouble Ticket
X.21
- A serial data interface for synchronous data popular in Europe. X.21 uses
balanced data and unbalanced signal lines. The Zephyr models 9201, 9200, 9101, and
9100 support X.21 using part #9822 cable.