Oc-12C/Stm-4C Atm Interface Card Specifications - Nortel Versalar 15000 Installing And Maintaining

Installing and Maintaining the Versalar Switch Router 15000

OC-12c/STM-4c ATM Interface Card Specifications

The OC-12c/STM-4c ATM interface card provides the Versalar 15000 with a
622 Mb/s ATM interface. This connection is concatenated, which provides for
increased efficiency by eliminating the need to partition the bandwidth.
Each OC-12c/STM-4c ATM interface card incorporates the following primary
components:
• Reassembly
The transceivers support packet reassembly (converting ATM cells to
packets). The transceivers can handle up to 4000 simultaneous reassemblies
(based on an average packet size of 280 bytes). In addition, the reassembly
application-specific integrated circuit (ASIC) supports up to 15,000 active
virtual circuits.
• Segmentation
The transceivers also support segmentation (converting packets to ATM cells).
The segmentation ASIC supports up to 15,000 active virtual circuits.
Fiber optic transmission defines two types of fiber: single-mode and multimode.
Signals can travel farther through single-mode fiber than through multimode fiber.
The maximum distance for single-mode installations is determined by the amount
of light loss in the fiber path. See
and power budgets for single-mode and multimode fiber optic lines.
Table A-4.
Transceiver
Type
Single-mode*
Multimode
* Complies with Bellcore GR-253 Intermediate Reach Specification
† nm = nanometers
A-6
Table A-4
Maximum Fiber Optic Power Budget and Transmission
Distances
Power
Budget Transmit Power
13 dB -15 to -8 dBm at
1261 to 1360 nm†
11 dB -19 to -14 dBm at
1270 to 1380 nm
for details on transmission distances
Maximum
Distance Between
Receive Power Stations
-28 to -8 dBm Up to 9.3 miles
(15 km)
-30 to -14 dBm Up to 1.2 miles
(2 km)
308684-B Rev 00