Question about Cisco X2-10GB-ZR module

[strangly]

Dear all,

As per subject, i have questing about Cisco 10GB module. Iately we purchased 8 unit of this module, but we do not know what is the minimum length of SMF needed between them in order not to burn the Fiber / Fiber module. In the Cisco Website, we only can find the statement pasted at below.

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Cisco X2-10GB-ZR

Supports link lengths of up to about 80 km on SMF. This interface is not part of the 10 Gigabit Ethernet standard but is built according to Cisco optical specifications.

* Minimum cabling distance for -LR, -SR, -LX4, -ER modules is 2m, according to the IEEE 802.3ae standard, and minimum cabling distance for -LRM modules is 0.5m, according to IEEE 802.3aq standard.

** Requires 5 dB 1550 nm fixed loss attenuator for < 20 km. Attenuator is available as a spare. The part number is WS-X6K-5DB-ATT=.

*** Links longer than 30 km are considered engineered links.

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Cisco Webside did not disclosed any futher information about this module, hereby search for help with anyone who happen to know about detail of this module, or ever deployed with "X" Meter of distance.

Thanks.

Strangly

[paolo bevilacqua]

You have posted the answer above:           

* Minimum cabling distance for -LR, -SR, -LX4, -ER modules is 2m,  according to the IEEE 802.3ae standard, and minimum cabling distance for  -LRM modules is 0.5m, according to IEEE 802.3aq standard.

**  Requires 5 dB 1550 nm fixed loss attenuator for < 20 km. Attenuator  is available as a spare. The part number is WS-X6K-5DB-ATT=.

[strangly]

Hi Paolo Bevilacqua,

Thanks for your reply. But no.., the double star "**" is apply to ER, i cut and paste entire table below for reference.

Table 1. X2 Port Cabling Specifications

Cisco X2	Wavelength (nm)	Cable Type	Core Size (Microns)	Modal Bandwidth (MHz*km)	Cable Distance*
Cisco X2-10GB-CX4	-	CX4 (copper)	-	-	15m
Cisco X2-10GB-T	-	CAT6A/CAT7 (copper)	-	-	100m
Cisco X2-10GB-SR	850	MMF	62.5 62.5 50.0 50.0 50.0 50.0	160 (FDDI-grade) 200 (OM1) 400 500 (OM2) 2000 (OM3) 4700 (OM4)	26m 33m 66m 82m 300m 400m
Cisco X2-10GB-LRM	1310	MMF	62.5 50.0 50.0	500 400 500	220m 100m 220m
		SMF	G.652	-	300m
Cisco X2-10GB-LX4	1310	MMF	62.5 50.0 50.0	500 400 500	300m 240m 300m
Cisco X2-10GB-LR	1310	SMF	G.652	-	10 km
Cisco X2-10GB-ER**	1550	SMF	G.652	-	40 km***

* Minimum cabling distance for -LR, -SR, -LX4, -ER modules is 2m, according to the IEEE 802.3ae standard, and minimum cabling distance for -LRM modules is 0.5m, according to IEEE 802.3aq standard.

** Requires 5 dB 1550 nm fixed loss attenuator for < 20 km. Attenuator is available as a spare. The part number is WS-X6K-5DB-ATT=.

*** Links longer than 30 km are considered engineered links.

Cisco Website not even has ZR in the table. My understand is:

1 star = LR, SR, LX4, and ER can connect using 2M fiber without using Attenuator.

2 star = ER need to use Attenuator if below 20KM.

but above statement, ER is conflit in between 1 star and 2 star. Im not very strong in englis, so maybe im miss understand the english term, on top of that, it still did not mention ZR should use Attenuator?, i was looking for definate answer because that module is extremely expensive.

Thanks.

[paolo bevilacqua]

Yes for short links you will need attenuators of even 10 dB. refer to table 3

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6574/product_data_sheet0900aecd801f92aa_ps5251_Products_Data_Sheet.html

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