6TASYS101-1E
TOTAL ACCESS 3000/3010
SYS-101
Page 36 of 46
Total Access
®
3000/3010 System Manual© 2003, ADTRAN, Inc.
5.1.2 DS3/STS-1
Multiplexers are optional components of Total Access 3000/3010. Multiplexers can be
installed in the shelf after the other modules are installed and the system is up and
running. Multiplexers can be added after initial installation and provisioning, and
existing or new circuits can be served through the multiplexers.
The two slots designated for multiplexers are for redundancy. A single multiplexer can
support a fully loaded shelf with any technology combination. When two multiplexers
are installed, they function in a 1:1 protection arrangement. (This protection applies to
the multiplexer electronics but not to the coax cabling to the multiplexers.)
The DS3 or STS-1 multiplexer system requires the optional coax interface adapter
(BNC Module). This module makes the physical coax connection from the network to
the Total Access System. The field-installable BNC Module can be added at any time
after initial installation. Both multiplexers in a 1:1 protected system share this single
high-speed interface.
Installing a DS3 or STS-1 multiplexer does not preclude using DSX-1 network
interfaces. Access modules can derive their network interface from either the DS3 or
STS-1 multiplexer or from a built-in DSX-1 interface depending on how they are
provisioned. Total Access 3000/3010 can support a mix of these network interfaces
with some slots deriving their network interface from the multiplexers and other slots
from the DSX-1 interface.
The DS3 or STS-1 multiplexer incorporates full Time Slot Assignment (TSA)
capability for payload. Any DS1 or DS2 in the DS3 payload can be delivered to any
slot in the system. Therefore, if the first three slots use DSX-1 network interfaces, the
fourth slot can still deliver any DS1 in the DS3 or STS-1 payload.
5.1.3 OC-3
The Total Access 3000/3010 system incorporates the option to have a SONET OC-3
multiplexer as the network source. The OC-3 multiplexer is a terminal MUX and
subtends off a higher order SONET ring. Unlike the DS3/STS-1 multiplexers
discussed in Section 4.4.2, the OC-3 MUX, when used in the Automatic Protection
Switching configuration, protects both the electronics and the path back to the SONET
ring. In addition, a second transmit/receive pair is required to the Add-Drop MUX
from which it is subtending.
Like the DS3/STS-1 multiplexers, the OC-3 provides full TSA for the incoming
VT1.5s in the data stream. The L1 (List 1) OC-3 MUX uses only the first STS-1 in the
OC-3 transport to provide 28 VT1.5s to the shelf in which the MUX is operating. The
L2 (List 2) OC-3 MUX will receive the full OC-3 payload and convert 28 VT1.5s in a
single STS-1 to 28 DS1s for delivery to a local shelf and delivers two STS-1s to two
subtended shelves via a Quad BNC module.
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