M160
From JuniperClue
| |
| FPC/PIC Slots | 8 FPC, 32 PIC |
| Agg. Bandwidth | 102.4 Gbit/s |
| FPC Types | type-1 type-2 |
| PIC Style | PB-style |
| Power Supplies | 2 (1+1) DC only |
| Switch Board | SFM (4) |
| Release date | March 28, 2000 |
The M160 (Codename: Manhattan) was the third router released by Juniper in March 2000, following the release of the M20. Internally, it is implemented using four of the Packet Forwarding Engines of the M40 in order to scale to 10 Gigabit per Slot speeds. The M160 was introduced in March 2000.
As of 2005, the Juniper M160 has reached End of Sale (EOS) status. The router is considered to have been effectively replaced with the M320, which is based on the new Gibson architecture, and which utilizes the same PICs as the M160. However, the technology of the M160 continues to be used in the M40e, which is a scaled-down version of the M160.
Innovations
The M160 was the first router to support OC-192c interfaces. It was also the first Juniper router to support hot-swapping of PICs without disabling or removing the host FPC.
Physical
The M160 is a "half rack" chassis, 35 inches (20 RU) high, 29 inches deep, and 17.5 inches wide. The chassis has a fully loaded weight of 370.5 lbs (168kg), and can contain up to eight type-1 or type-2 FPCs. Each FPC can contain up to four PICs with PB-style mechanicals. Alternatively a special IB-style PIC which fills an entire FPC slot is used for 10 Gigabit interfaces.
Power
Only DC power supplies are available for the M160. 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 3000 watts, and supports input voltages in the range of -42 to -72 volts.
Cooling
The air intake vent is located at the bottom of the chassis front, below the cable management system. The air filter is removable and covers the air intake vent.
The front cooling subsystem cools the FPCs, PICs, and midplane. It includes a fan tray located behind the cable management system and a large, central impeller behind the craft interface.
The rear cooling subsystem cools the Switching and Forwarding Modules (SFMs), host module, Packet Forwarding Engine Clock Generator (PCGs), and power supplies. It includes one impeller located at the upper right of the chassis rear and another at the lower left. The upper and lower impellers are not interchangeable.
Craft Interface
The M160 provides a front panel Craft which contains an LCD, alarm lights, Routing Engine, Management Ethernet ports, serial console ports, FPC status lights and FPC offline/online buttons.
Routing Engine
The M160 originally shipped with the RE-2.0 (P2 333mHz, 768MB), but later shipped with the RE-3.0 (P3 600mHz, 2048MB).
Forwarding
The M160 is a Martini architecture router, but differs from other martini architecture routers in that it has four instances of the martini PFE operating in parallel. Most of the PFEs are contained on the SFM cards, including the A and Cf chips, while the B-Chips remain on the FPCs. There are multiple B-Chips per FPC to interconnect to the back-end part of the PFE on the SFMs. The DX-Chip is a programmable packet switch that makes it possible for traffic from any of the PICs to be directed toward any of the B-Chips and thus any of the SFMs.
Because in the martini architecture, no single SFM is able to handle more than 3.2gbit/sec from a FPC (see FPC Bandwidth), packets from a single OC-192c must be sprayed across multiple SFMs. This leads to a risk of packet reordering.
Hot Swapping
All removable components (power supplies, routing engines, SSBs, FPC, PICs, and fans) are hot swappable. The M160 was the first Juniper router to support hot-swapping of a single PIC.
