Enterasys brim-f6 Benutzerhandbuch

CHAPTER 4:  SPECIFICATIONS

Page 4-6

Multimode Fiber:

Core diameter:

62.5 

µ

m nominal

Cladding diameter:

128.0 

µ

m maximum 

122.0 

µ

m minimum

Cable attenuation:

≤

 2.5 dB/km typical

Single Mode Fiber:

Core diameter:

8.7 

µ

m +/- 0.5 

µ

m

Cladding diameter:

127.0 

µ

m maximum

Cable attenuation:

≤

 0.5 dB/km typical

The PMD FDDI standard specifies the following:

Maximum total 
cable length:

100 km (62 miles) — dual ring
200 km (124 miles) — wrapped

Maximum multimode
cable length between 
adjacent nodes: 

2 km (1.2 miles)

The SMF-PMD FDDI standard specifies the following:

Maximum total
cable length:

100 km (62 miles) — dual ring
200 km (124 miles) — wrapped

Single mode cable length
between adjacent nodes: 

40 km (24 miles) maximum
25 km (15 miles) typical

The TP-PMD FDDI standard specifies the following:

BRIM-F Book  Page 6  Monday, January 29, 1996  9:26 AM