CANOGA PERKINS 2262 T1/E1 Fiber Optic Modem - Manual (Page 14)

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Canoga Perkins 2262 T1/E1 Fiber Optic Modem
2.3.3 Alarm Relay Connectors
The Alarm Relay Connection shares the DA-15 or terminal block. See Figure 2-4 for
details.
2.3.4 E1 Impedance Switch
An impedance switch is provided to select either 75
Ω
(BNC connectors) or 120
Ω
(terminal block) for E1 models only. On stand alone models, this switch is located
on the rear panel.
On rack-chassis models, the switch is located at the rear printed circuit board edge,
above the optic transmitter connector. The Up setting is for 75
Ω;
the Down setting
is for 120
Ω
.
2.3.5 Loopback Switch
The Loopback switch (located on the front panel) is to be set in the Off position for
normal operations.
2.4 Rack Mount Installation
The 2201 Rack Chassis is designed to accommodate up to ten 2262 modems; see
Figure 2-5. The 2201 will fit into a standard 19-inch equipment rack. Tabs are
provided on each side of the unit and are predrilled for standard spacing. For
further details, refer to the 2201 Rack Chassis User Manual.
Figure 2-5.
2201 Rack Chassis