M7i

From JuniperClue

**Juniper M7i Router**

FPC/PIC Slots	1 FPC, 4 PIC, 1 FIC
Agg. Bandwidth	4.2 Gbit/s
FPC Types	Type-1
PIC Style	PE-style
Power Supplies	2 (1+1 redundant)
Switch Board	CFEB (non-redundant)
Release date	November 3, 2003

The Juniper M7i (Codename: Calvin) router replaced Juniper's M5 router. The M7i is a minor product refresh which decreased the cost of production and improved capacity (through the introduction of a FIC) and feature sets (through the introduction of onboard Tunnel PIC functionality and an optional onboard Adaptive Services module). The primary goal of the M7i development was to make Juniper's low- to mid-range platforms more price competitive with the Cisco 7200 series.

Innovations

The M7i and M10i were the first routers released using the ABC-Chip chipset, and replaced the older Martini architecture based M5 and M10 respectively. The ABC-Chip reduced the cost of production significantly. The M7i also reduced the weight of the M5 by about half.

Physical

The M7i is 3.5" (2U) high, 17.5" wide (19" with rack ears), 18" deep, and weighs 36.5lbs when fully loaded.

Power

Both AC and DC power supplies are available for the M7i. The system requires one power supply for operation, with a second for redundancy. When two power supplies are operating, the load is shared across both. The maximum system power draw for a fully loaded configuration is around 274 watts. The AC supply supports input voltages in the range of 100-264 volts, while the DC supply supports from -36 to -72 volts.

Cooling

The M7i is cooled by 4 fans proving side to side cooling with airflow from left to right. The fans are field replaceable but the router should not be operated without fans for more than a moment. The cooling requirements are met by 3 operating fans.

Routing Engine

The M7i originally shipped with RE-5.0 (Celeron 400MHz, 256MB/512MB/768MB DRAM), but now has the RE-5.0+ (Celeron 850MHz, 1536MB DRAM) available as an option.

Forwarding

The M7i utilizes the Calvin architecture which is largely the same as the Martini architecture. The Calvin architecture does have somewhat lower performance than the Martini (16Mpps vs 40Mpps) but the M7i does not have sufficient PIC slot capacity to approach this reduced limit.