3Com 3C10111C - NBX 100 - Modular Exp Base, Руководство по установке, Страница: 34 / 210

34 C
HAPTER
1: I
NTRODUCTION
E1 Digital Line Card The E1 Digital Line Card, used outside of North America, provides E1
connectivity using the ISDN PRI protocol. It carries data at a rate of 2.048
Mbps and can carry 32 channels, each with 64 Kbps. Thirty of these
channels are available for calls. Like the T1 ISDN PRI Card, the E1 PRI Card
supports PRI software features such as DID.
The SuperStack 3 NBX system can accommodate up to 24 E1 Digital Line
Cards (720 channels). The NBX 100 system can accommodate up to 3 E1
Digital Line Cards (90 channels). If you connect an E1 Digital Line Card
using the NBX 100 system backplane, the system can accommodate only
one card.
3C10165D includes an onboard CSU. The 3C10165D can provide CSU
performance statistics, can be enabled for loopback testing, and can be
configured as a remote device that communicates with its NCP over a
routed network.
ISDN PRI services require specific circuit provisioning, which you must
obtain before using this card. See
Appendix B for more information. for
more information.
Figure 10 E1 Digital Line Card (3C10165C)
Figure 11 E1 Digital Line Card (3C10165D)
Each
3C10165C
E1 card has the following lights and connectors:
■
E1 — This RJ-48C connector makes a connection to an ISDN interface
channel service unit/data service unit (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 E1 card is not receiving
carrier signals from the far end of the E1 line.