Zhone Technologies IMACS-200 - Manual (Page 231)

OWAN Ports 13-1
Chapter 13
OWAN Port
13.1 Introduction
This chapter provides configuration, and troubleshooting information for the optional Optical
WAN (OWAN) port. This port is labeled on the rear faceplate as OWAN1 and OWAN2.
Connectors above each OWAN port LED indicator carry both the transmit and receive
connections within each fiber. The OWAN port is a single transport facility that allows for a
1+1 protection, auto-switching when a loss of Signal (LOS) or transmitter fail event occurs.
Refer to the IMACS-200 Ordering Guide on page vi of the Product Description Chapter for
information regarding units that contain the Optional OWAN interface.
13.2 OWAN Port
13.2.1 OWAN Port Description
The OWAN port provides two full duplex T1 or E1 compliant DS2 or E2 single-mode optical
ports for optical serial N times 64 kbps interface capability. Only one of the ports can be active,
with the other being a redundant link. Each optical port contains a transmit (Tx) and receive
(Rx) in a single connector along with a status LED. The DS2 or E2 data is extracted from the
encoded optical signal and demultiplexed into four standard DS1 or E1 signals. Optical
connection between two IMACS-200 units is achieved using two bi-directional fibers, one
active and one redundant.
The IMACS-200 OWAN circuit will terminate four DS1 or E1 signals, and multiplex them
into a single DS2 or E2 formatted signal. The IMACS-200 supports various alarm detection
events such as Optical LOS, DS2/E2 OOF, etc. The OWAN port is a 1310 nm single-mode
fiber transmission path up to 20km using only one fiber for both directions. The second
OWAN port is a redundant unit, auto-switching when the transmitter fails, or if a LOS event
occurs. The IMACS-200 will report local as well as remote alarm indications.
The IMACS-200 employs a CMI (Coded Mark Inversion) encoder and decoder to provide the
ability to extract a clock from the data stream and to decode and encode DS2 and E2 overhead
information including T1 remote loopbacks (available in a future release) and protection
switching data. Currently the IMACS-200 does not support the even bit.