Mitel MIVOICE OFFICE 250, Руководство по установке и администрированию

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MiVoice Office 250 Installation and Administration Guide
158
Connecting CO Trunks to a European System
Some trunks are connected using the fallback system. See “Maintenance Tasks” on page 1-247 .
The trunk connections are made to the designated Krone blocks.
Lightning Strike Protection Methods
For protecting the system against lightning strikes, attach the two ferrite split beads around each
cable just below the Amphenol-type connector, as shown in Figure 19 on
page 157
.
For additional lightning protection, install gas discharge tubes with silicon avalanche suppressors
to ground (grounding rod or copper cold water pipe) on each CO, DID, and OPX trunk. This must
be done external to the system. Each gas discharge tube is installed directly between the telephone
company (network provider) RJ-type block and the system CO/DID/OPX input. This protection
should provide energy absorption and filter low-level surge potentials. Also, in areas with frequent
occurrences of lightning, it is recommended that the cable length between the telephone company
(network provider) RJ-type blocks and the gas discharge tubes be at least 75 ft (22.5 m). The cable
may be coiled up as needed.
Built-In Ports for WAN Fail Survivability
The loop start ports and single line ports are built-in to the CS Controller to provide Wide Area
Network (WAN) Fail Survivability through Power Fail Bypass circuitry. When not in WAN Fail
Survivability mode, the ports support CO loop start trunks and single line phones in the system
configuration.
The WAN Fail Survivability feature allows calls to be made from one more single line phones through
the CO [branch exchange] during a network outage. A customer can dial out and receive calls at
any time through these connections. But, the single line phones and loop start trunks connected to
the built-in ports continue to operate during a network outage. For more information about WAN Fail
Survivability, see the Product Description chapter.
RJ-14 jacks on the back of the CS Controller provide interfaces for the Loop Start Ports and Single
Line Ports that make up the WAN Fail Survivability feature. See
Figure 20
.
For this procedure, see Figures 21 and 22 on page 1-160 as a guide. For HX Controller platforms,
see also “Setting Up Power Fail Transfer Capability” on page 142.
Figure 20: Built-In Loop Start and Single Line Ports
Dual Loop Start Port Dual Single Line Port (to single line phones)
DUAL LS DUAL SL
EXP
PAGE MOH
Chassis Back (CS Controller in this example)