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Chapter 2 Applications
28 Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide
Note: For the ATM access module these requirements are specified in Appendix A,
Specifications. For other devices, refer to the user guides that accompany those
devices.
• Does your network conform to the ATM configuration rules?
Ensure that your network meets the configuration rules described below.
ATM Configuration Rules
There are several things that you should consider before configuring your network:
• Your cables and equipment must meet all of the technical specifications.
The ATM cable you connect to the ATM access module, must conform to the
Single-mode Fiber IEC 793-2 and ANSI/TIA/EIA-492CAAA and Multimode
Fiber (MMF-PMD) standards defined by ANSI x.3-166-1992.
Avaya supports two cable technologies - optical and SDH- and design-
performances of two types of fiber cable, Single-mode and Multimode.
—9 µm Single-mode fiber (SMF) cable. The maximum inter-station distance
(including device-to-network connectors) should not exceed 15 km (9.32
miles).
— supports 62.5/125mm multi-mode fiber (MMF-PMD) cable. The maximum
inter-station distance (including device-to-network connectors) should not
exceed 500 m (0.31 miles).
• Allow for attenuation (weakening of signal) when calculating cable lengths.
• Ensure that you have sufficient bandwidth.
See Appendix A, for more details.
Note: You cannot connect one M-ACC module to another; this is due to the
signalling requirements used by ATM and LANE. There must be a standards-based
ATM Switch between the two ATM access modules for them to operate correctly.
Warning: You can make a maximum of 16 ELAN-to-VLAN associations per M-ACC
ATM Access module (in the range VLAN 1 to 254 only). When you add another
M-ACC module to an Avaya M770 domain you can add more associations, however
you must ensure that you do not make the same associations twice since this will
result in a loop. You can use the redundancy feature in which case all the
associations should be the same. You cannot change or delete the default ELAN-to-
VLAN association (Default ELAN associated to VLAN 1) but only Enable/Disable
it.