3Com 7000 manual Mixed Fibers combination

118APPENDIX D: CABLING REQUIREMENTS

Verifying Maximum If you mix Category 1 and Category 2 receivers and transmitters, use Attenuation for Table 30 to verify the maximum attenuation for each possible

Mixed Fibers combination.

Table 30 Acceptable Cable Plants for Combination of Categories 1 and 2

		Minimum Loss	Maximum
Output Category	Input Category	(dB)	Attenuation (dB)
1	1	0.0	10.0
1*	2*	1.0	16.0
2	1	14.0	26.0
2	2	15.0	32.0

*This combination is dispersion-limited rather than loss-limited. The expected maximum length is approximately 35 km.

Example. If a Category 2 transmitter is outputting to a Category 1 receiver, the maximum attenuation is 26.0.

DS-3 Coax Cables Connect the CoreBuilder 7000 DS-3 interface by a 75 Ohm coaxial cable that complies with DS-3 standards. The maximum cable length is 450 feet. To connect the DS-3 interface:

1Prepare two coax cables - one for Tx and one for Rx. You may want to mark the ends of the cables to identify them easily.

2Connect both cables to the DS-3 BNC connectors on the CoreBuilder interface. Make sure to connect Rx and Tx cables according to what is indicated on the interface front panel.

3Connect the two cables at the other end according to the opposite of the first connection Rx to Tx and Tx to Rx.

Ethernet Cabling The Ethernet port of the CoreBuilder allows you to connect the CoreBuilder to an Ethernet network for Network Management Station (NMS) connectivity (such as Transcend™). The Ethernet port is a standard RJ-45 connection of a terminal side.

Follow these guidelines for 10BASE-T cabling:

■Use only copper, unshielded twisted-pair (UTP) wiring. Do not use flat, multiconductor cable (for example, silver satin), which is often identified by solid colors such as red, green, yellow, or black.