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61182301E1-5A 5
Rear Panel Connections
Connectors on the rear panel (Table 3) provide for the following connections:
Figure 3 displays the NTU-8F Rear Panel connections.
Figure 3. NTU-8F Rear Panel Connections
LBK
{
z
z
z
Off
Green
Yellow
Red
No loopback on selected channel
Selected G.703 E1 port in local loopback
Selected G.703 E1 port in remote loopback (PN127 or V.54)
Selected G.703 E1 port in local or remote loopback (PN127 or
V.54); when no port is selected, this becomes an OR’d
summation of all loopbacks on all ports
BERT
{
z
z
z
Off
Green
Yellow
Red
Selected G.703 E1 port BERT not active
Selected G.703 E1 port BER, with no errors
Selected G.703 E1 port BERT active with errors
Selected G.703 E1 port active, but not in sync
Table 3. Rear Panel Connectors
Connector Type Function
Fiber Optic SC-type Optical Connect single-mode fiber (1310 nm transmit;
1510 nm receive)
Port 1-4 RJ-45 Connect four G.703 E1s
ENET CAT 5 Modular Jack Connect 10/100 Ethernet
Craft DB-8 (RS-232) used to view menus and upgrade the NTU-8F; No
provisioning or testing can be initiated
External Alarms DB-15 Connect to six external alarm inputs
–48V, 250 mA 4-pin Terminal Block Connect to power (NTU-8F has a detachable
mating terminal screw block)
Table 2. Front Panel LEDs (Continued)
Label Status Description