Mediant 1000 Digital
Fast Track Guide 10 Document #: LTRT-63802
Rack Mount Safety Instructions (UL)
When installing the chassis in a rack, be sure to implement the following safety
instructions recommended by Underwriters Laboratories:
• Elevated Operating Ambient - If installed in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be greater than room
ambient. Therefore, consideration should be given to installing the equipment in an
environment compatible with the maximum ambient temperature (Tma) specified by
the manufacturer.
• Reduced Air Flow - Installation of the equipment in a rack should be such that the
amount of air flow required for safe operation on the equipment is not compromised.
• Mechanical Loading - Mounting of the equipment in the rack should be such that a
hazardous condition is not achieved due to uneven mechanical loading.
• Circuit Overloading - Consideration should be given to the connection of the
equipment to the supply circuit and the effect that overloading of the circuits might
have on overcurrent protection and supply wiring. Appropriate consideration of
equipment nameplate ratings should be used when addressing this concern.
• Reliable Earthing - Reliable earthing of rack-mounted equipment should be
maintained. Particular attention should be given to supply connections other than direct
connections to the branch circuit (e.g., use of power strips.)
2.4 Cabling the Mediant 1000
Protective Earthing
The equipment is classified as Class I EN60950 and UL60950 and must be earthed at all
times. Units providing power sockets with three pins must be connected by service
personnel to a socket-outlet with a protective earthing connection.
¾ To cable the Mediant 1000, take these 7 steps:
1. The Mediant 1000 must be permanently earthed using an equipment-earthing conductor.
Connect an electrically earthed strap of 16 AWG wire (minimum) to the chassis earthing
screw, using the supplied washer. The connection to the protective earthing should be in
accordance with the regulations enforced in the country of installation.
2. Connect the E1/T1 trunk cables to the ports on the I/O module/s. Connect the other ends of
the trunk cables to your PBX/PSTN switch.
For a 1+1 or 2+2 fallback option, connect trunks 1 and 3 to your PBX and trunks 2 and 4 to
the PSTN. If the power fails, a relay connects trunks 1 to 2 and 3 to 4 (in the same module)
acting as a fallback for PSTN trunks.
To protect against electrical shock and fire, use a 26 AWG min wire to connect T1 or E1
ports to the PSTN.
RJ-48c trunk connectors are wired according to Figure 2-1 below.
Figure 2-1: Pinout of the RJ-48c Trunk Connectors
1 2 3 4 5 6 7 8
3, 6, 7, 8
not connected
body = shield
1 = Rx RING
2 = Rx TIP
4 = Tx RING
5 = Tx TIP
RJ-48c Connector and Pinout
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