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Mapping is configuring a DCS product at the time slot level on a port by port basis. A map is a layout
of the 24 time slots (1-24) on each of the six DCS ports. The time slots act as transmission channels.
With six ports of 24 time slots each, there are 144 (6 x 24) possible channels. All six ports can operate
as either internal communications ports or as ports for network paths. You can configure a map using
ISiCL or IntraGuide (Map Control tab – Section 5.3.4.3).
4.1 Map Switching
The DCS has eight maps (map 0 to map 7). Map 0 is the default normal service map. You can
configure map 0 in any way that meets the needs of your environment. The default, alternate, normal
service map is map 7. You could use it, for example, for normal operation at a different time of the
day. You can configure Maps 1 through 6 to allow switching based on any of these events:
●
Definable T1 port failure, such as
•
Loss of frame (LOF)
•
Loss of data (LOD)
•
Alarm indication signal (AIS), all ones signal
•
Bit error rate (BER) threshold exceeded
•
Remote alarm
●
Execution of a command with ISiCL or IntraGuide; that is, map switching is remotely initiated by
either
•
User
•
Automated application on a client PC
●
External transistor transistor logic (TTL) input. A TTL input interfaces with contact closures and
third party equipment
Section 6 – "Configuration Using ISiCL" gives specific information on creating and editing time slot
maps with ISiCL, and Section 5 – "Configuration Using Intraplex IntraGuide" gives IntraGuide
information.
The DCS can be programmed to switch from one map to another if a failure occurs on a port. For
example, if the DCS is operating on the normal service map (map 0) and a failure occurs on the
network path connected to port 1, it switches from map 0 to map 1. All ports are affected in this
switch, not just port 1. Table 4-1 shows the map switching logic for the DCS.
The DCS can only change to one other map, upon the first failure. Subsequent failures do not cause it
to change to another map.
Table 4-1. DCS Switching Logic
When
DCS Switches
Failure
from Map 0
Occurs on...
to...
Port 1
Map 1
Port 2
Map 2
Port 3
Map 3
Port 4
Map 4
Port 5
Map 5
Port 6
Map 6
GatesAir
Intraplex Products
Section 4 – Mapping Basics
4-1
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