Comtech EF Data SMS-7000 - Manual (Page 24)

Introduction SMS-7000 Modem Protection Switch
1–4 Rev. 3
1.1.2 Data Formats
Table 1-2 lists the data formats that the switch will support.
Table 1-2. Data Formats
Data Type Connector
V.35 Data 25-pin D
EIA-422/MIL-STD-188 Data IDR 8K Data Channel 37-pin D
G.703 Balanced 15-pin D
G.703 Unbalanced Coax BNC
EIA-232 Data 25-pin D
ADPCM Audio Data or 64K Data Overhead 9-pin D
Engineering Data Channel ASYNC Overhead 25-pin D
Alarms 25-pin D
Under the following conditions, the switch is designed to operate with prime modems
configured with different overhead data types, such as, IDR, IBS, D&I, ASYNC, or
NONE; and/or with different terrestrial data types, such as, EIA-422, V.35, or G.703:
•
Modems must be one of the following models:
! SDM-6000
!
SDM-8000
!
SLM-6650
!
SLM-8650
•
Backup modems must have an AS/2876 interface relay board option installed, in
order for the backup modem to switch between IDR, IBS, and Custom mode.
•
Backup modems’ switching mode must be dependent when there is a mixture of
prime modem types. Example: Prime 1 is IDR, and Prime 2 is IBS, EIA-422.
Backup modems must be comparably equipped to the prime modems assigned.
(Example: Backup #1 is an SDM-8000 configured with a relay card and a sequential
decoder. It can backup prime modems (SDM-8000) that are configured as prime #1 IDR
and prime #2 configured for Custom sequential. Backup # 2 can also be an SDM-300
backing up a set of prime SDM-300 modems. The backup modems can be directed to a
specific set of modems.)