3Com 3C10111C - NBX 100 - Modular Exp Base Installation Manual page 31

T1
3C10116C 3Com NBX Digital Line Card
ISDN PRI services require specific circuit provisioning, which you must
obtain before you can use the T1 card in PRI mode. See
more information.
Figure 8 T1 Digital Line Card (3C10116C)
Figure 9 T1 Digital Line Card (3C10116D)
The T1 Digital Line Card has the following lights and
3C10116C
connectors:
T1 — This RJ-48C connector makes a patch cord connection to a T1
■
interface (CSU/DSU).
Status Lights — These lights indicate the status of the card's
■
signaling, synchronization, and loop back test.
CF — On indicates a Carrier Failure. The T1 card is not receiving
■
carrier signals from the far end of the T1 line.
RA — On indicates a Remote Alarm. The far (remote) end of the T1
■
line is not receiving appropriate signaling from the T1 board.
LB — On indicates that loop-back testing is in progress.
■
Nominal — On indicates ready to send and receive information.
■
10BASE-T Uplink — This RJ-45 Ethernet connector connects the T1
■
card to an external LAN hub or switch. You can use this connector to
isolate T1 traffic. If the T1 Digital Line Card is used in an NBX Gateway
Chassis, you do not need to use this connector because the NBX
Gateway chassis is connected to the LAN.
If you use the Uplink connector, be sure to program the switch or router
on the other end for 10BASE-T 10 MB operation.
Console — This DB-9 connector provides an RS-232 (DCE) TTY
■
terminal connection for maintenance access.
Overview of NBX Cards and Devices
10BT UPLINK
CF
RA
Nominal
MDI-X
LB
31
Appendix B for
CONSOLE