Troubleshooting guide

61186003L1-1D 3-3
APP-301
Standard DS3-Fed System Application
USAGE
The standard DS3-Fed application for the MX2820 system allows the M13 Multiplexer (MUX)
module to accept a single DS3 input signal from the network and provide twenty-eight T1 or
twenty-one E1 output signals (or a combination thereof as allowed by DS2 framing) on the
terminal (customer) side.
With a 1:1 redundant configuration, two M13 MUX modules can accept a single DS3 signal
from the network. Each M13 MUX pair communicates with each other to share information
regarding provisioning and the presence of signals and trouble conditions. Each STS-1 MUX
will communicate with the MX2820 SCU (1186003L1) with regards to alarm reporting and
performance monitoring.
One M13 MUX module, slot A in the MX2820 shelf, is considered the primary (working) unit,
and the other M13 MUX module, slot B in the MX2820 shelf, is considered the protect
(standby) unit.
DS3 Interface
The MX2820 backplane provides two standard BNC coax female connectors for the M13 MUX
module, one for the DS3 transmit path and the other for the DS3 receive path.
The 19-inch shelf provides 14 BNC connectors, and the 23-inch shelf provides 18 BNC
connectors.
DS3 Cabling Specifications
Refer to “Section 2, Engineering Guidelines” for cable specifications.
DSX-1 Interface
The MX2820 backplane provides two 60-pin FutureBus connectors for each DSX-1 signal, one
for the DSX-1/E1 transmit Tip and Ring pairs, and the other for the DSX-1/E1 Receive Tip
and Ring pairs.
DSX-1 Cabling Specifications
Refer to “Section 2, Engineering Guidelines” for cable specifications.