Verilink 2100 (34-00187) Product Manual - Manual (Page 15)

Installation 2-7 2100 CSU
Power Connection
The standalone unit and the modular chassis unit require a -
19- to 60-VDC power supply capable of delivering 4.3 watts
per unit. Power supplies are available from TxPORT and are
listed in Optional Equipment on page 1-4.
Connect the ground lead before apply-
ing power to the unit.
Standalone Unit
The power source is connected to pins 1 and 3 of the Power
and Alarm terminal as shown in Table 2-J on page 2-6.
Connect a chassis ground lead (18- to 20-gauge is recom-
mended) to the Frame Ground terminal (pin 4). Connect the
other end of this lead to an appropriate facility ground.
Often, the 48 DC return is also ground. In that case, both
return and ground leads should be connected to ground.
Connect the lead of the -48VDC source to the -V terminal
(18- to 20-gauge wire is recommended). Connect the return
lead of the 48-volt source to the +V terminal. When powered
up, the STATUS indicator on the front panel lights and the
unit goes through the normal LED sequencing.
Chassis Unit
the chassis is designed with two power buses. The A bus
feeds the odd slots while the B bus feeds the even slots.
Refer to Figure 2-6 on page 2-5 for an illustration of the
1051-2 rear panel and to the appropriate 1051 chassis con-
figuration guide for further information.
Three modes of powering the chassis are available:
Redundant Power Source
A redundant power board is factory installed on power con-
nector TB2 which allows connection of two independent -48
VDC supplies operated in a redundant mode. All slots are
powered from the combined input of the A and B power sup-
plies. If either supply fails, the other powers the entire
chassis.
Single Power Source
Using a single power source is essentially the same as the
redundant configuration with power supply B not opera-
tional. If the redundant power board is not used, the A bus
and the B bus must be connected together with a jumper.
Dual Power Source
When using a dual independent power supply, one -48 VDC
source feeds the A bus while another -48 VDC source feeds
the B bus.
Each 2100 CSU requires a 19- to 60-VDC power
supply capable of delivering 4.3 watts. Ensure
the proper fuse size is used. Refer to the 1040
Power Shelf configuration guide.