Connecting The ISDN–PRI Line To The System
Terminate the end of the ISDN–PRI line with a miniature 8-pin modular plug, and plug it into the main jack on
the front edge of the T1/PRI board.
The T1/PRI board contains a built-in CSU that protects the DXP Plus from voltage surges, provides transmission
drive up to 6,000 feet, and performs diagnostic tests for the network. Therefore, a customer-supplied CSU is not
necessary unless your customer requires this addition.
If a direct connection to a repeater is within a few hundred feet, the transmit signal from the T1/PRI board may
overdrive the repeater. Repeaters normally operate best with -7.5 to -23 dB input signals. Arrange LIU switches 2,
3, and 4 to set the transmit signal level (0 dB is default).
IMPORTANT CAUTION
To help ensure that external over-voltage surges do not damage the system, Comdial advisors suggest
that you install a properly-grounded gas discharge tube or a similar primary protection device on the T1
trunk where it enters the building. If the site includes a network interface box, verify that there is standard
lightning protection installed externally to the box on its network side. Primary protection where the
cable enters the building is necessary to prevent a fire hazard inside the building.
Detailing the Cable Requirements
Normally, the ISDN–PRI connection to a central office is via a network interface box (smart jack). The box is
usually small with an 8-pin modular telephone jack for connecting to the customer premise T1 equipment. For
short lengths of approximately 200 feet or less, use a standard telephone cable with an 8-pin modular plug for
connection to the T1/PRI board. Make straight-through connections for pins 1, 2, 4, and 5 when using these plugs
on both ends of the cable.
When spanning distances greater than 200 feet, use a low-capacitance cable (data-grade cable) having two
twisted, solid-conductor wire pairs with shielding. The type of cable with metal shielding covering each twisted
pair provides the best immunity from electrical interference. Only connect the shielding to earth ground at one end
of the cable—do not ground the shielding at the other end of the cable.
IMI89–255
Installing And Programming The DXPRI Card
24 – Connecting The ISDN–PRI Line To The System
Содержание DXP Plus Series
Страница 1: ...Digital Communications System R ...
Страница 363: ...Automatic Call Distributor Technical Manual R QuickQ DXP ...
Страница 424: ...Automatic Call Distributor System Manager s Guide R QuickQ DXP ...
Страница 500: ...Wrap up Time 1 6 Wrapping Up A Call 4 3 Z Zoom Box A 2 GCA70 271 Index I 3 ...
Страница 628: ...Interconnecting The VMI X Installing And Programming For ExecuMail IMI89 206 Installing And Programming For ExecuMail 5 ...
Страница 677: ...Connecting The Equipment Installing And Programming The OPX X IMI89 209 Installing The OPX X 7 ...
Страница 728: ...DP I I I I and FX Series Digital Communications Systems Understanding The Visual Man Machine Interface COMDlA ...
Страница 1112: ...9 08 8 90 1 13 4 78 3 94 UNIS029 TAB003 PLS page 6 GCA40 130 DXP Plus General Description 11B Telephone Features ...