User's Manual

1027145–0001 Revision E 6–28 Installing indoor hub equipment Hub installation
The CCM HT LAN interface (shown in figure 6-15) is an RJ–48
connector that connects the IDU to the hub LAN router, which
provides connectivity to the Element Management System (EMS).
The LAN interface supports 10BaseT, up to 10 Mbps.
The reference clock interface (shown in figure 6-15) is also a
RJ–48 connector. It connects the customer’s clock distribution
network to the IDU. (The EMS operator has to configure the IDU
to accept an external clock.)
The CCM LED indications are explained in the following
illustration:
OK
STATUS
ALARM
()Red
On: Hardware failure
()Green
On: Normal operation
or CCM startup
T0009052
Service–specific interface modules (SSIs) provide interfaces to
support specific network services. SSI types used depend on the
needs of the customer network.
The following SSIs can be installed in the HT IDU chassis:
• DS3–TDM SSI (HNS 1027094–0001)
• OC3c–ATM (HNS 3003136–0003)
• DS3–transparent (HNS 1027094–0002)
The OC3c–ATM SSI is installed in chassis slot 3 only, and the
DS3–TDM SSI is installed in slot 5 only.
The DS3–TDM SSI, shown in figure 6-17, provides a structured
or transparent D3 service link between the HT and RT.
Figure 6-17 DS3–TDM SSI
Tx
ALARM
OK
Rx
TDM
SSI
3
DS
T0006022
BNC Rx connector
BNC Tx connector
OK
STATUS
ALARM
SSI status
LEDs
Link status LEDs
The maximum cable length for a DS3–TDM SSI is 450 feet (137.2
meters).
CCM LAN and clock
interfaces
LED indications
6.5
SSIs
DS3–TDM