DSX-80/160 T1/E1/PRI Line Card
The T1/E1/PRI Line Card provides T1 advanced digital calling and gives the DSX-80/160 a maximum of 24 trunks in a single card slot. The available T1 line types include:
• Loop Start (DTMF and Dial Pulse)
• Ground Start (DTMF and Dial Pulse)
• Direct Inward Dialing (DID) Wink Start (DTMF and Dial Pulse)
• Direct Inward Dialing (DID) Immediate Start (DTMF and Dial Pulse)
• E&M Tie Line Wink Start (DTMF and Dial Pulse)
• E&M Tie Line Immediate Start (DTMF and Dial Pulse)
Tips to remember:
• Normally you connect the T1/E1/PRI Card to a separately-purchased Channel Service Unit (CSU).
Use a standard straight-through CAT 5 cable to connect the T1/E1/PRI Card to the CSU. The CSU in
turn connects to the telco smart jack.
• The T1/E1/PRI Card also provides 32 E1 support. E1 is not used in North America.
• PRI is currently not available.
• You can install a T1/E1/PRI Card in any slot except slot 1.
Cat 5 Cable (Category 5)
Category 5 cable includes four twisted pairs in a single cable jacket. This use of balanced lines helps preserve a high signal-to-noise ratio despite interference from both external sources and other pairs (this latter form of interference is called crosstalk). It is most commonly used for 100 Mb/s networks. Cat 5 cable typically has three twists per inch of each twisted pair of 24 gauge copper wires within the cables. Cat 5E is an enhancement which yields data rates of 155 Mb/s. Cat 5 or better cable should be used for all VoIP systems.
DID (Direct Inward Dial)
Inbound-only phone number assigned to a group of phone lines that allows a phone system to route to a unique location or person. A group of DIDs is often assigned to a single trunk group. This is typically offered on digital PRI lines or SIP lines and is the method that gives individual employees their own number. A PRI that can handle 23 simultaneous calls may have hundreds of DIDs pointing to this group, but the maximum number of inbound and outbound calls at any given time is still 23.
IP (Internet Protocol)
A protocol that specifies the way data is broken into packets and the way those packets are addressed for transmission. Unlike traditional telephone lines which create a straight path from caller to recipient; IP uses the best available path at any given moment to move data packets between point A & point B. The beauty of IP is that the sending end and receiving end communicate success in sending and receiving to insure all data packets are delivered. A really great concept of IP is that of self healing. If a route is broken and the data packets cannot be delivered an alternate route is automatically selected.
