The 17 SMR9 FS, 24
SMR9 FS, 34 SMR9 FS, and SMR20 FS/SMR20 FS CV cards are
tunable over 96 channels in the C-band, at 50-GHz spacing on the ITU-T grid.
The cards provide the flex spectrum capability, which give the flexibility to
allocate channel bandwidth, to increase the network scalability. The channel
bandwidth is not fixed, but can be defined arbitrarily, with a specified
granularity and within a given range. For each sub-range, attenuation and power
values are defined. The central frequency ranges from 191350 Ghz (1566 .72 nm)
to 196100 Ghz (1528 .77 nm).
The 17 SMR9 FS, 24
SMR9 FS, 34 SMR9 FS, and SMR20 FS/SMR20 FS CV cards are
single-slot cards that integrate two cross-connect blocks (multiplexer and
demultiplexer), a variable gain EDFA pre-amplifier, and a variable gain EDFA
booster amplifier. In addition, the SMR20 FS CV card has a dedicated laser source
at the demultiplexer section, and a photodiode at the multiplexer section;
these support the connection verification capability. The 17 SMR9 FS, 24
SMR9 FS, and 34 SMR9 FS cards support up to 9 directions for each ROADM node.
The SMR20 FS/SMR20 FS CV card support up to 20 directions for each
ROADM node. The cards can be installed in any service slot in the
Cisco NCS 2000 Series chassis. The cards can be used in
point-to-point, ring, multi-ring, or mesh topologies.
The
SMR20 FS CV cards provide the connection verification capability using a
connectivity check signal. The correctness and the quality of the
interconnections (determined by measuring the insertion loss of the external
passive path) can be validated with the connection verification feature in the
cards . For more information about the connection verification, see
Connection
Verification section.
The EDFA
pre-amplifier in SMR20 FS/SMR20 FS CV cards
have switchable gain ranges. The following table describes the gain ranges and
extended gain ranges of a EDFA pre-amplifier in the 17 SMR9 FS, 24 SMR9 FS, 34
SMR9 FS, and SMR20 FS/SMR20 FS CV cards.
Table 17 Gain Ranges and
Extended Gain Ranges of EDFA Pre-Amplifier
Card
|
Gain Range
|
Extended Gain
Range
|
17 SMR9 FS
|
0 - 17 dB
with controlled tilt
|
20 dB with
uncontrolled tilt
|
24 SMR9 FS
|
12 - 24 dB
with controlled tilt
|
27 dB with
uncontrolled tilt
|
34 SMR9 FS
|
20 - 34 dB
with controlled tilt
|
40 dB with
uncontrolled tilt
|
SMR20 FS/SMR20
FS CV
|
Gain Range 1:
0 - 17 dB with controlled tilt
|
20 dB with
uncontrolled tilt
|
Gain Range 2:
12 - 24 dB with controlled tilt
|
35 dB with
uncontrolled tilt
|
For more information,
such as the block diagrams and the card specifications of the 17 SMR9 FS, 24
SMR9 FS, 34 SMR9 FS, and SMR20 FS/SMR20 FS CV cards,
see the
data sheet.