Cisco Systems 6200 appendix NTC OC-3 Specifications, What is the NTC STM-1?

78-5296-02 10/02/98 Hardware Description 1

1.3.3 NTC OC-3 Specifications

Table 1-4 lists the physical and electrical specifications of the NTC.

Table 1-4	NTC OC-3 Specifications
Specification		Description
External interface		One SONET STS-3c (155 Mbps).
		Single-mode (intermediate reach) and
		multimode OC-3c versions available
Connector type		SC
Fiber types		• Single mode (up to 15 km)
		• Multimode (up to 2 km)
Average transmitted power		• Single mode: –11.5 dBm
		•	Multimode: –17 dBm
Average received power		• Single mode: –28 to –8 dBm
		• Multimode: –30 to –14 dBm
Transmission distances		• Single mode: up to 15 km (9.2 miles)
		• Multimode: up to 2 km (1.2 miles)
Wavelength (both modes)		1310 nm
Level 2 protocol		ATM
Timing		Loop timed
Internal interface		16-bit parallel bus at 10 Mbps (160 Mbps
		total throughput)
Internal hardware		•	Motorola MC68360
		•	0.5M of PROM
		• 4M of RAM
		•	Odetics SONET interface
Dimensions		1.5 x 15.75 x 9.75 in
(width x height x depth)		(3.8 x 40.0 x 24.8 cm)
Weight		2 lb (0.9 kg)
Power consumption		26W

1.3.4 What is the NTC STM-1?

The NTC STM-1 is a service interface module that concentrates the data traffic from all Cisco 6200 subscriber ports and connects the node to a single trunk line from the service-providing ATM network. This full-duplex channel unit carries data both downstream (to the subscriber) and upstream (from the subscriber).

The trunk is a full-duplex STM-1 fiber optic channel. One STM-1 channel terminates at a single

NTC.

The NTC STM-1 is available in both single-mode and multimode versions. Multimode fiber is LED-driven and is designed for distances up to 2 kilometers (1.2 miles). Longer distances (up to 15 kilometers or 9.2 miles) require laser-driven single-mode fiber.

In the downstream direction, the NTC STM-1 accepts ATM cells at the SDH rate (155.52 Mbps) and adapts these cells to the Cisco 6200 internal bus.

Cisco 6200 User Guide 1-13