ADC T1MF2S04RA, HMS-318 user manual Ethernet Remote Management Ports, Heat Dissipation Factors

December 20, 2004			Chapter 1: Product Description
	Table 1-4. J27 – AUX RS-232 Management Port (DTE)
	Pin No.	Signal	Direction
	1	Shield	—
	2	Transmit Data (TD)	Out
	3	Receive Data (RD)	In
	6	Data Set Ready (DSR)	In
	7	Ground (GND)	—
	20	Data Terminal Ready (DTR)	Out

ETHERNET REMOTE MANAGEMENT PORTS

The BNC connector J24 (labeled 10 BASE-2), see Figure 1-10, can be used to connect the management ports of up to 32 shelves into an integrated network through a 10 BASE-2 (Thinnet) Ethernet LAN (IEEE.802.3). The rear-panel RJ-45 connector J25 (labeled 10 BASE-T), see Figure 1-10, provides a 10 BASE-2 or a 10 BASE-T (Twisted-Pair) Ethernet LAN (both IEEE.802.3 compatible).

14 -12 6 1R1

J24	J25
		50
10 BA SE -2	AUX RS 232 DTE PO RT	2 5
	10 BA SE -T

	50	26
OS RS 232 P ORT	25	1
		S PA N PAIR 1

26

CO PA IR 1 1

1 2 3 4 5

-4 8VA -4 8V B BAT RTN FGND

FUS E FUS E P INS 3 & 4

15 A MA X 15 A MAX MUS T B E BRI DGE D

1		25
26	CO PA IR 2	50

1 2 5

2650

S PA N PAIR 2

Figure 1-10. Multishelf Network Ports

Daisy-Chaining 10BASE-2 Connections

10BASE-2 management ports of up to x number of shelves can be hubbed together by daisy-chaining together using the included BNC-T connector. The last 10BASE-2 connection must be terminated with the included 50 ohm BNC terminator.

HEAT DISSIPATION FACTORS

The HMS-318 List 3 shelf is a 12-inch (30.48 cm) deep individual CO equipment shelf with open-faced mountings for natural convection cooling. The maximum heat dissipation for open-faced, natural convection-cooled mountings is limited to 134.7 Watts per square foot as defined in Section 4.1.4 of the NEBS standard for Physical Protection (GR-63-CORE) for all equipment placed in a CO environment.

The heat dissipation footprint of an HMS-318 List 3 shelf is approximately 5.9 square feet. Therefore, the maximum permissible heat dissipation per rack is 5.9 square feet x 134.7 Watts per square foot equals 790 Watts.

The maximum allowable heat dissipation for each telco-style equipment rack is:

• 790 watts for a 19-inch (48.3-cm) wide rack

LTPH-UM-1261-01 1-13