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Installation and Operation Manual Chapter 1 Introduction
Optimux-106 Ver. 6.1 Functional Description 1-5
Tributary Interface Characteristics
The Optimux-106 tributary interfaces meet the requirements of ITU-T Rec. G.703.
The tributary ports (1-4) are 100Ω balanced line interface, terminated in an RJ-45
8-pin connector.
Line coding is B8ZS or AMI. The nominal balanced interface transmit level is ±3V.
The maximum line attenuation is up to 6 dB, and each T1 signal is processed by
an adaptive equalizer that compensates for various cable lengths to ensure
optimal performance. Phase locked loops (PLL) are used to recover the clock
signals, and the resulting jitter performance complies with the requirements of
ITU-T Rec. G.824.
Each tributary interface has its own set of indicators that show the current state
of the tributary link. The user can disable the alarm indications generated by
unused interfaces. AIS data streams are transmitted instead of failed or
unconnected tributary data streams.
Ethernet User Interface Characteristics
The optional Ethernet user port is 10/100BaseT interface with throughput of up
to 75Mbps, full and half-duplex capabilities, autonegotiation, flow control,
complying with the 802.3 standard. It supports an MDI/MDIX connection.
Though USER-ETH port has 100 Mbps capability it achieves 75% utilization only.
Test and Diagnostics Capabilities
Optimux-106 has comprehensive test and diagnostic capabilities that include local
and remote loopbacks on the uplink and on each tributary link interface.
Maintenance is further enhanced by an automatically performed self-test on
power up.
For activating loopbacks, see
Chapter 4
.
Alarms and Alarm Indications
Optimux-106 detects the following alarm conditions on each T1 and uplink
interface:
• Loss of input signal
• Loss of frame synchronization (on uplink only)
• Reception of alarm indication (AIS) signal, which consists of a continuous
sequence of 1s (on the tributary only).
•
When AIS is received, loss of frame synchronization occurs. However, in this
case the loss of frame synchronization alarm is suppressed.
•
AIS alarm will not appear for the non-active optical link.
When not all the tributaries are in use, the user can disable the alarm indications
related to the unused tributaries through the software (see
Chapter 4
)
.