B-32
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Appendix B Specifications
MATM Specification
Note All service specific alarms, except red, are passed through transparently.
Loss of signal (red) at CBR interface results in all 1’s cells b ei ng t ra nsm itted.
Brief periods of cell los s “Starvation” results in insertion o f 47 oct ects o f 1’s.
Extended periods of cell loss results in all 1’s (unframed AIS) being generated.
During periods of cell bus configuration SAR-PDUs are discarded.
MATM Specification

Physical Layer Interface T1:

Physical Interface (T3.T1) RJ48-T3T1-LM
•T1 Line Interface Connector: Miniature RJ-48C, 100 ohms bal an ced
•T3 Line Interface Connector: BNC, 75 ohms unbalanced
Physical Interface (E3.E1) RJ48-E3E1-LM:
•E1 Line Interface Connector: Miniature RJ-48C, 100 ohms bal an ced
•E3 Line Interface connector: BNC, 75 ohms unbalanced
Physical Interface (E3.E1B)
SMB-E3E1-LM:
•E1 Line Interface Connector: Miniature SMB, 75 ohms unbalanced
•E3 Line Interface Connector: Miniature SMB, 75 ohms unbalanced
Line Rate: 1.544 Mbps ± 50 bps
IMATM Synchronization: Digital PLL to synchron iz e a ll transmitters to one of t he
following: the T3 line, any of the T1 lines, or the MGX8220
shelf 8 kHz clock
Line Code: Bipolar 8 zero substitution (B8ZS) as specified in ANSI
T1.408
Line Framing: Extended Superframe Format (ESF 24 frame multiframe) as
in ANSI T1.408