Cabling the DS3 and E3 Port Adapters

This chapter describes supported cabling configurations for the DS3 and E3 port adapters, and is organized into the following sections:

For detailed, up-to-date configuration instructions, see the following publications:

Catalyst 8540 MSR Software Configuration Guide
LightStream 1010 ATM Switch and Catalyst 8510 MSR Software Configuration Guide
Catalyst 5000 Series Software Configuration Guide

For command-line interface (CLI) command descriptions, see the following publications:

Catalyst 8540 MSR Command Reference
LightStream 1010 ATM Switch and Catalyst 8510 MSR Command Reference
Catalyst 5000 Series Command Reference

Note All ATM interfaces are full duplex. You must use the appropriate ATM interface cable to connect the ATM DS3 or E3 port adapter interface with an external ATM network.

DS3 and E3 Port Adapter Supported Interfaces

The DS3 and E3 port adapters provide an interface to ATM switching fabrics for transmitting and receiving data at up to 45 Mbps (DS3) or 34 Mbps (E3) bidirectionally. The ATM port adapter can support interfaces that connect to the following physical layers:

DS3 45-Mbps coaxial cable
E3 34-Mbps coaxial cable

Note For descriptions of ATM cabling requirements, refer to the section "ATM Connection Equipment Requirements" in the chapter "Installing ATM Port Adapters."

DS3 and E3 Port Adapter Connectors

To connect the DS3 port adapter and E3 port adapter to an external ATM network, use a 75-ohm RG-59 coaxial cable with bayonet-style twist-lock (BNC) connectors .
(See Figure 5-1.)

Caution
The DS3 and E3 ports must be connected to a network termination unit (NTU). NTU devices should comply with UL 1950, CSA 950, EN 60950, and IEC 950 standards.

Note For a description of these connectors, see the section "ATM Connection Equipment Requirements" in the chapter "Installing ATM Port Adapters." (Figure 2-4 shows a coaxial interface cable with BNC connectors.)

Figure 5-1: DS3 and E3 Coaxial Connections and LEDs

DS3 and E3 Port Adapter LEDs

The LEDs provide status information for the individual DS3 and E3 interface connections. The LEDs are described in Table 5-1 and shown in Figure 5-1.

Table 5-1: DS3 and E3 Port Adapter LED Descriptions
LED Description

CD (carrier detect)

Off---Carrier detect signal not received
Green---Carrier detect signal received

RX (receive)

Off---LOS¹ or shutdown
Flashing green---Cells being received
Red---Alarm (LOF², LCD³, AIS⁴)

TX (transmit)

Off---No transmit line activity
Flashing green---Cells being transmitted
Steady yellow---Alarm FERF⁵

¹LOS = loss of signal.
²LOF = loss of frame.
³LCD = loss of cell delineation.
⁴AIS = alarm indication signal.
⁵FERF = far-end receive failure.

LED	Description
CD (carrier detect)	Off---Carrier detect signal not received Green---Carrier detect signal received
RX (receive)	Off---LOS¹ or shutdown Flashing green---Cells being received Red---Alarm (LOF², LCD³, AIS⁴)
TX (transmit)	Off---No transmit line activity Flashing green---Cells being transmitted Steady yellow---Alarm FERF⁵

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