User's Manual

EXHIBIT 6.
USER’S MANUAL
The MDR-8000 series Microwave Digital Radios (see Figure ) consists of:
• Solid-state, licensed, digital radios that provide transport for DS1 and E1 in 1.85, 2, 6,
7, 8, 10, and 11 GHz RF bands, DS3 in 2, 6, 7, 8, and 11 GHz RF bands, and OC3 in 6,
7, 8, and 11 GHz RF bands
• Solid-state, unlicensed digital radios that provide transport for DS1 and DS3 in the 5
GHz RF frequency band.
The following capacities and modulation schemes are available:
• MDR-8000 – 2, 4, 8, 12, or 16 North American Standard DS1 channels at either 32 or
128 TCM or 1, 2, or 3 North American Standard DS3 channels with 1, 2, or 3 wayside
DS1 channels at 64 QAM
• MDR-8000i – 2, 4, 8, 12, or 16 CCITT E1 channels at either 32 or 128 TCM
• MDR-8000u – 2, 4, 8, or 16 North American Standard DS1 channels at 32 TCM.
SHELF CONFIGURATIONS
The MDR-8000 is available in two shelf configurations: hot-standby and CommPak.
HOT STANDBY SHELF
The MDR-8000 hot-standby shelf is wired hot-standby and can be configured non-
standby, where only the A-side is populated, or hot-standby, where both the A- and the B-
sides are populated. The hot-standby shelf fits into a standard 19 in. (483 mm) rack and
occupies seven vertical rack increments. Up to four fully equipped hot-standby radios can
be mounted in a standard 7 ft. rack. The radio is front accessible and can be mounted
against a wall or back-to-back against other equipment.
COMMPAK RADIO
The MDR-8000 CommPak radio is available as a full indoor shelf or outdoor unit in a
cabinet.
COMMPAK INDOOR SHELF
The CommPak indoor shelf is wired and configured non-standby only. The indoor shelf
fits into a standard 19 in. (483 mm) rack and occupies four vertical rack increments (7
in.). The radio is front accessible and can be mounted against a wall or back-to-back
against other equipment.